Propulsion, Autopilot, Servo, Parachute, Gimbals, ETFs, ROVs, Sensors

UAV Propulsion Tech is a US company that markets advanced UAV technology from Germany, Canada, Sweden, United Kingdom and Estonia into the US Unmanned Aerial Vehicle market. These solutions include consumer off the shelf (COTs) and custom: propulsion, autopilot, servo/actuator, parachute, gyro stabilized EO/IR gimbal systems, electric turbofans, pneumatic launchers, capacitive liquid level sensors and engine sensors. These products are proven solutions that are flying on several high-end global UAV platforms. Underwater remote operated vehicles (ROVs) were recently added to support underwater inspection/mapping/surveillance. This website provides more info about the various companies and solutions available to the US market.

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  • Nova Ray Underwater Remote Operated Vehicle

    Nova Ray Underwater Remote Operated Vehicle

  • Reventec Ltd. capacitive liquid level and engine sensors

    Reventec Ltd. capacitive liquid level and engine sensors

  • Neva Aerospace electric turbofans optimized for static thrust for VTOLs

    Neva Aerospace electric turbofans optimized for static thrust for VTOLs

  • DST Control gyro-stabilized electro-optical systems (EO/IR) & small light-weight thermal imagers

    DST Control gyro-stabilized electro-optical systems (EO/IR) & small light-weight thermal imagers

  • MicroPilot Autopilots

    MicroPilot Autopilots

  • Protect UAV Rescue/Recovery Chutes

    Protect UAV Rescue/Recovery Chutes

  • Hirth Propulsion Solutions

    Hirth Propulsion Solutions

  • Volz Servo Actuators

    Volz Servo Actuators

DST Control

DST Control

Light-weight, high performance gyro-stabilized electro-optical systems with both EO and IR capabilities, and small light-weight thermal imagers.
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Hirth Motoren GmbH & Co. KG

Hirth Motoren GmbH & Co. KG

Consumer off the shelf and custom aircraft propulsion systems including starter/generator systems.
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Volz Servos GmbH & Co. KG

Volz Servos GmbH & Co. KG

Consumer off the shelf and custom actuators for industrial and aerospace applications.
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Consumer off the shelf and custom autopilots for helicopter, fixed wing, and multi-rotor UAV's.
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UAV Propulsion Tech Post #20 – UAV EO/IR Gimbal Solutions

Blog #20

I just started representing DST Control in April of this year and market their gyro-stabilized EO/IR gimbal solutions and thermal imagers in North America.  DST Control is based in Linköping, Sweden and has several European UAV customers but wants to expand into the US UAV market.  I thought I would put together a blog showing some of the details of DST’s solutions.

Gimbal requirements are putting higher demands on the ability to see and detect under difficult conditions.  These requirements include pointing stability, detection distance, photon sensitivity and bandwidth.   This forces the development of specialized sensors, micro mechanical precision components, advanced software and electronics hardware resulting in more complex gimbal systems.

DST has a  range of advanced gyro-stabilized gimbal systems from  135mm diameter to 254mm diameter as shown below:

Figure 1: DST Control Gyro-Stabilized Gimbal Product Line

DST named their gimbal line “OTUS” which is Latin for owl since the owl’s head operates like a perfect gimbal.  The OTUS-U135 is one of the smallest sensor systems on the market and can package 1 or 2 sensors (such as EO/IR cameras or laser).   They go up in size to package larger sensors and additional sensors.  The OTUS-U205 can package 3 sensors and the OTUS-U250 is the largest with the best stabilization and sensor options.  The OTUS-U135, OTUS-L170 and OTUS-L205 are available with either <100μrad stabilization or <250μrad stabilization.  The OTUS-U250 is a 4-axis gimbal and has the highest stabilization of <50μrad  and has the largest area for sensors.  Reference the photo below of the inside of the OTUS-U250.










Figure 2 – Inside of OTUS-U250

I have detailed the specifications of the OTUS family of gyro-stabilized gimbals further below:

OTUS-U135 (Product Brochure)





OTUS-L170 (Product Brochure)




OTUS-L205 (Product Brochure)




OTUS-U250 (Product Brochure)




The sensor options are Sony EO cameras, FLIR infrared cameras, DST’s own SAITIS-640 thermal imagers, and laser pointers/range finders/illuminators.  A key benefit of SAITIS-640 thermal imagers is they are not ITAR controlled like other infrared solutions.

SAITIS-640 is one of the smallest long-wave infrared imagers available on the market.  SAITIS-640 is based upon a uncooled microbolometer FPA (amorphous silicon, spectral band 8-14 μm) with 640×480 pixels resolution. Unique features for the SAITIS-640 is its low weight and size (from 27mm x 27mm x 26mm) but also the minimum power requirements (1W).

The video output is PAL/NTSC video but also digital video output is available. The camera is controlled via a standard RS-232 interface. The camera is available with or without integrated shutter for NUC (Non-Uniformity Correction). The shutter-less version, SAITIS-640-X, requires an external shutter to perform the NUC. The camera with integrated shutter, SAITIS-640-S, has an automatic NUC manager integrated for easy-to-use operations.

The camera is ready-to-use without any training. All image processing is executed on-board, hence no external units are required. The SAITIS-640 can be equipped with a wide range of optics optimized for short-, medium or long range operations and has maximum exportability even in full frame rate.

I have supplied more details below for DST SAITIS-640 thermal imager alternatives:

SAITIS-640 (Product Brochure)




Gimbal Options:

Video Tracking:  The Automatic Video Tracking Option means that the OTUS gimbal will have a software function capable of locking the LOS onto a specified object in the image.  Hence a moving object on the ground will remain locked onto the center of the OTUS video or IR image at all times, provided the optical features meet certain requirements.

Geo-Location: The Geo-Location option means that the OTUS gimbal will have a software function capable of outputting the GPS position of the viewed object centered in the video or IR image. For this function to work, it is required that two external sensors are connected to the gimbal:

  1. An external GPS sensor providing the position  of the vehicle (e.g. the position of the base of the gimbal).
  2. An external heading source providing the heading of the vehicle (e.g. the heading of the base of the gimbal).

Geo-Tracking: The Geo-Tracking option means that the OTUS gimbal will have a software function capable of locking the LOS onto a GPS geographical position on the ground. Hence the gimbal can be commanded to move to and maintain any given geographical position centered in the image.  This option assumes that the Geo-Location Option is enabled.

Laser Accessories:

  • Laser Range Finder (50 m to 4000 m): a device used to measure the distance to an object by measuring the time of flight for a laser beam emitted by the sensor and reflected by the object.
  • Laser Pointer & Laser Illuminator: a device that sends a laser beam to point out an object. The device is available with a wide variety of specifications depending on customer demands.

Low Temperature Option: means that the OTUS Gimbal unit is equipped with an internal heating element to ensure proper operation of payloads that are otherwise unable to operate at lower temperature. The lowest possible operating temperature is -40°C.


Figure 3 – Firefly Hand Control Unit (HCU)

The Handheld Control Unit (HCU) is used for manual control and monitoring of one OTUS Gimbal Unit at a time.  The HCU is intended for direct wired connection to the OTUS Gimbal Unit, or for connection to the OTUS Gimbal Unit via an external wireless link. The external wireless link must be capable of bilateral transmission of a serial data stream between the HCU and the Gimbal Unit, and unilateral transmission of an analogue video signal from the Gimbal Unit to the HCU.

If you have any questions regarding these solutions, please call or email me at:  PH: +1 (810) 441-1457.

Key UAV News for the Week:

Industry Events for July:

Quote for the week:

“There are no limitations to the mind except those that we acknowledge.” – Napoleon Hill

UAV Propulsion Tech is unmanned aerial vehicle (UAV) hardware solution provider of propulsion, servo, autopilot, rescue/recovery parachutes, electric turbofans, pneumatic launchers, capacitive liquid level sensors, engine sensors and gyro-stabilized EO/IR gimbal solutions. Click on the HOME link above or go to for more info.


UAV Propulsion Tech Post #19 – Triple Redundant UAV Autopilot


I am the US rep for MicroPilot and market their autopilots to US UAV customers.  I have permission from MicroPilot to re-print a white paper they have on their website titled “MP21283x MicroPilot’s Triple Redundant UAV Autopilot” authored by Sarah Vallely in 2010.  I think this white paper is more relevant today as the defense and commercial markets are trying to improve UAV reliability when flying in extreme environments in theater as well as in civilian airspace.

MP21283x MicroPilot’s Triple Redundant UAV Autopilot

Triple redundancy (3X) gives autopilot technology the reliability necessary to safely carry out sensitive flight missions and transport valuable payloads. A triple redundant arrangement is comprised of three similar software and hardware systems. If any one of the three systems fails, the remaining two take over, offering a double redundancy arrangement. If one of the other two systems should fail, the third takes over. An additional mechanism is also included to oversee these three systems. Triple redundant systems are highly tolerant of autopilot hardware failures.

Triple redundant autopilots are not new. Military aircrafts such as the RAF’s Trident fleet, used a triple redundant autoland systems in the early 1960’s. Ten years later, the Aérospatiale-BAC Concorde took advantage of 3X technology in its flight control system. Presently, triple redundancy is used in several manned military and commercial  aircrafts.

Although 3X technology is established within the aviation industry, triple redundant autopilots are a relatively new addition to unmanned areal vehicles (UAVs). MicroPilot, the leading UAV autopilot manufacturer, is setting the benchmark for triple redundancy UAV autopilots. MicroPilot, based in Manitoba, Canada, has been designing autopilots for fixed-wing, transitional and helicopter UAVs since 1994. In 2006 MicroPilot started designing a triple redundancy autopilot for heli and fixed wing UAVs. The MP21283x product will launch September 2010.

The MP21283x is comprised of three of MicroPilot’s MP21283g autopilots, mounted on  an adapter board, or redundancy board. The three MP2128 g’s are prioritized. At the start, the autopilot in position one flies the airframe. If this autopilot should fail, the MP2128 g in position two takes over, and so on. The redundancy board provides several input/output (I/O) ports. The board also includes two RS232 serial ports designed to communicate with a ground control system via radio modems. As a result of this design, users never need to work directly with bare circuit boards. Additionally, the autopilots do not have individual casing, keeping overall weight to a bare minimum. However, the entire redundancy board is enclosed to protect the system.


This white paper covers the benefits of the triple redundant MP21283x and what specific conditions this autopilot is designed for. Features of the MP21283x will also  be  explained, including multiple communication links, backup high current drivers, backup power supplies, and independently generated servo signals. Synchronization, modification and testing products will be discussed as well.

Who Needs the MP21283x

Any flight mission that cannot be recovered with the implementation of a flight termination system benefits from triple redundancy. A UAV that comes down over a forest or ocean, for example, is difficult to recover. It is also good judgment to install 3X technology in a UAV that flies over built-up and environmentally sensitive geographic areas.

Additionally, when flying expensive airframes, 3X can help cut losses by minimizing crash damage. Likewise, high dollar payloads are better insured with the installation of the MP21283x. MicroPliot’s 3X solution is also a good choice for large UAVs to avoid the glut of complications that come about when these large vehicles come down. High speed UAVs and those taking long missions also benefit from triple redundant technology. Traveling at high speeds does not allow UAVs time to recover from a failure, considering parachute deployment typically involves a complicated multi stage recovery system.

Identify Failures Quickly

The key benefit of the MP21283x is its ability to quickly detect hardware faults, especially those involving sensors. For example, a rate gyro with a full scale reading of 300 degrees per second, results in an attitude error of 30 degrees in just 100 milliseconds. This miscalculation   could   be   devastating,   especially   if   the   UAV   hovers   next   to you.  Determining sensor discrepancies is no simple matter. Sensor data cannot simply be compared, as noise and phase shift cause correct data to appear faulty.

If your UAV flights call for error-free transitions, the MP21283x is a practical solution. The MP21283x is built to transition vehicle operation seamlessly between autopilots. For example, during takeoff and landing, jumps in control positions can cause damage due to the UAV’s close proximity to the ground. The MP21283x is designed to avoid sudden control inputs, which could cause the UAV to strike the ground. The MP21283x is also design to smoothly transition when a failure takes place on ground or during other critical flight phases (i.e. final approach). Moreover, if failure occurs during initial takeoff roll, the autopilot aborts the takeoff.

Choosing the MP21283x over the MP2128LRC

For those debating between MicroPilot’s MP21283x and the MP2128LRC, here are some tips to help you decide which product best fits your needs. Although the LRC offers such features as redundant radio modems, redundant RC override, integrated radio modems, and a backup microprocessor, the MP21283x may be a better solution. The LRC backup processor allows a backup pilot to fly the UAV manually in the event of a failure; however, completing flights without the autopilot is difficult. For example, manual flight is challenging particularly if the UAV is far from its destination. Not only do flying maneuvers need to be made manually, failures also need to be identified by hand (i.e. the backup pilot must monitor the UAV continuously for failures, allowing for ample recovery time). Due to MP21283x’s redundant features, this product weighs and costs more than the MP2128LRC. Therefore, if weight and price are key factors, the MP2128LRC is a better choice.

MP21283x Ultimate Reliability Measures

In addition to the three MP2128gs incorporated into the MP21283x, MicroPilot’s triple redundant autopilots provide even more backup components. These include provisions for multiple communication links, backup high current drivers, backup power supplies, and independently generated servo signals. Two different types of global positioning systems are also used to improve reliability.

Multiple Communication Links: The MP21283x acts as the UAV’s communication hub. Two radio modems can be installed, which offers two independent lines of communication between the autopilot and the ground control station. Devices such as pan tilt zoom cameras (PTZ) and aircraft transponders (which enable ground control to identify the UAV) can also be connected to the autopilot. The MP21283x’s redundant datalink between the UAV and the ground control station insures the UAV operator can continue to monitor and control the UAV as well as other important on-board equipment even if one radio link fails. The MP21283x switches communication links when flight operation is transferred from one autopilot to another autopilot. This ensures the operator on the ground is always monitoring and controlling the autopilot flying the UAV.  See Figure 2.


To conserve communication channels, non-essential devices, such as data collection systems (i.e an air quality monitor), are connected to only one autopilot. However, critical devices, such as the transponder, are plugged into a communication port that automatically switches between autopilots in the event of an autopilot failure.

High Current Drivers: The MP21283x simplifies its installation with eight high current drivers. The MP21283x can switch devices on and off that take high volumes of current (i.e. navigation lights and landing lights) without additional circuitry. Each of the three MP2128g autopilots is connected to eight high current drivers. These are parallel connections. This arrangement allows any of the autopilots to turn on a high current driver. As long as one autopilot is functioning, any of the devices connected to the high current drivers can be enabled.

Independent Power Supplies: Each MP2128g incorporated into the triple redundant MP21283x has an independent power supply. In addition, separate input pins are installed for power and ground in each backup autopilot. To ensure reliability, no components share a single power supply. Therefore, in the event that a component  fails, only a single autopilot is affected.

Pass or Fail OK Signals: For a triple redundant arrangement to truly function, a part of the system must know if and when an autopilot fails. Otherwise, a dysfunctional autopilot could continue to be in charge of the UAV and eventually drive the aircraft  into the ground. The three individual MP2128gs continuously watch state information from the other two autopilots. Each autopilot uses pulses to let the redundancy board know which autopilots are functioning properly. Based on the pulses the redundancy board receives, the board determines which autopilot operates the UAV.


Other systems that send a variety of signals (or logic levels), indicating different levels of autopilot function, have a higher chance of running into complications. When an autopilot malfunctions in a logic level system, the autopilot generates an OK signal when it should not. Therefore, instead of telling the redundancy board the autopilot is not functioning properly, it leads the redundancy board to believe the autopilot is operating correctly. To counter this, the MP21283x evaluates the pass/fail signal from all  autopilots. In this system, if a pulse is sent other than OK, the autopilot is deemed not working. Pulse timing is also monitored. Out-of-spec pulses are ignored, avoiding readings of misleading OK signals.


Triple GPS: In the event that one or more GPS systems fail, three are present on the redundancy board – two Ublox GPS modules and one Novatel GPS. The primary  autopilot is hooked up to the Novatel GPS module.

All of these aforementioned quality backup measures give the MP21283x the reliability factor UAV operators need to successfully complete sensitive and expensive missions.

Tri-autopilot Synchronization

Synchronization is key to automated flight function. For example, when implementing a target geolocation acquisition (TGA) system, the camera, GPS, and inertial measurement unit (IMU) must be in sync to determine an approximate ground position. Adding to the complexity, a redundant system calls for a whole new level of synchronization. Triple redundancy requires a variety of synchronized data within all three autopilots. There are six forms of data that must be synchronized:

  • Critical state information from feedback loops
  • Ground control data
  • Mission data
  • Scripting language
  • Sensor data
  • Autopilot sanity

The MP21283x incorporates an inter autopilot communication system within the MP21283x. This system synchronizes data and settings among all three autopilots, limits sudden jumps in the control outputs, and synchronizes systems to the same uplink data. “If the operator changes waypoints, targets or altitude, updated data propagates to the remaining autopilots. Without proper synchronization, flight missions can be jeopardized entirely if flight operation is transferred to another autopilot programmed with outdated data,” says Howard Loewen, MicroPilot President.

For example, data shared between ground control station and the flying autopilot must be uploaded to the other two autopilots. If a UAV flying at 100 feet receives an altitude change of 400 feet, this data needs to find its way into the other two MP2128g’s. Otherwise, the UAV returns to flying at 100 feet if control is transferred between autopilots. This could lead to a variety of problems, especially if flying over built-up, or mountainous, areas.

Furthermore, each autopilot must be programmed with the same mission. If not, after switching operation between autopilots, the new autopilot will execute a completely different set of waypoints. The MP2128g missions also include scripting language that allows MicroPilot customers to easily restructure their operations. These commands can have several states and/or modify the internal state of the autopilot. Synchronizing these commands on all three autopilots ensures states are kept consistent in the event of an operation transfer between autopilots.

Supporting Products

MicroPilot’s UAV autopilots are available with a complete suite of development tools. MicroPilot modified several of its auxiliary products to support the MP21283x. For example, its update program was simplified to more efficiently renew data stored in three separate autopilots. Horizonmp and in-the-loop simulator programs are also members of MicroPilot’s suite of MP21283x development tools.

HORIZONmp: MicroPilot’s ground control station software, HORIZONmp, includes a built-in software in the loop simulator. To provide the most realistic level of simulation, the SWIL is designed to accurately simulate three autopilots, as opposed to one. This simulation product also tests the inter autopilot communication system incorporated into the 3x.

qHWIL Simulator: MicroPilot includes a quasi hardware in the loop simulator. This MicroPilot product injects sensor data and retrieves servo positions through a serial port. The qHWIL simulator provides simulator data for three separate autopilots.

trueHWIL Simulator: MicroPilot provides a trueHWIL solution for all of its autopilots. This product inserts sensor data and retrieves control information electronically, providing the highest fidelity simulation available in the industry. The trueHWIL is designed to provide independent sensor data to all three autopilots.

Future Products

While the MP21283x provides the highest reliability UAV autopilot  system  and supporting products available to date, MicroPilot continues to improve its triple redundancy suite. For example, future MP21283x products will incorporate sensor sharing. With this feature, if an autopilot loses one of its sensors, it can still fly the UAV by accessing data from another autopilot’s sensor within the redundant system. As a result, sensor failures become less serious.

Dual autopilot redundancy is another feature MicroPilot is currently perfecting. With  this system, an MP21283x operating on only two autopilots is better equipped to detect  a partially failed autopilot.

Triple Confidence

MicroPilot’s MP21283x offers the high degree of redundancy UAV operators need to conduct UAV flights over geographical areas that offer little hope for recovering a lost

vehicle. When flight termination systems are not enough to protect your assets,  whether they are expensive airframes or high- dollar payloads, a triple redundancy autopilot is worth the investment. “Three autopilots, dual radios, power device backups, and reliable servo signals are a few of the features the MP21283x offers UAV manufacturers and operators,” says Loewen. “We kept our sights high when we designed our new triple redundant autopilot and supporting products.” Let the technology behind the MP21283x give you the assurance required to lift off.

For more information on MicroPilot’s autopilots, please visit my MicroPilot page at

Key UAV News for the Week:

Industry Events for MAY:

Quote for the week:

“We cannot become what we want to be by remaining what we are.” – Max DePree

UAV Propulsion Tech is unmanned aerial vehicle (UAV) hardware solution provider of propulsion, servo, autopilot, rescue/recovery parachutes, electric turbofans, pneumatic launchers, capacitive liquid level sensors, engine sensors and gyro-stabilized EO/IR gimbal solutions. Click on the HOME link above or go to for more info.


UAV Propulsion Tech Post #18 – UAV Chute Options


Parachutes can be used on UAV’s for recovery or rescue.  Recovery gives the UAV manufacturer an alternative that is not runway or “catch” recovery dependent (like nets or other means to grab the UAV during recovery).  Rescue gives the UAV manufacturer a safety means if there is a system failure during flight that causes the UAV to lose altitude.  These can include engine issues, fuel delivery issues, structural issues, pilot error, weather, or issues with control servos or electronics.  This helps protect the air vehicle and payload asset.

I wanted to supply more info on the types of parachutes available from Skygrahpics to protect fixed wing and multi-copter applications.  PROTECT UAV™ is a line of rescue/recovery products from Skygraphics, a division of Swing.  Swing is a developer and supplier of paraglider parachutes as well as advanced sails for ships (IS TEC brand).  I have attached some photos below of their consumer product experience.










Skygraphics is one of the few UAV rescue/recovery parachute developers/suppliers that has this broad range of parachute solution experience.  Located outside of Munich, Skygraphics has been successfully developing rescue/recovery parachute solutions for the European UAV market and have started supplying their PROTECT UAV™ solutions also to the US UAV market.


For a fixed wing application, the parachute can be packaged on the top or bottom with a compartment w/door that is released via a servo when the parachute needs to be deployed.  This can vary depending on UAV configuration but a typical deployment sequence is shown below:

Folie1 Folie2

2016-05-12_20-18-32 Folie4

A premium cross style parachute configuration is typically used for UAV applications because these provide the best performance.  I will show a graphic comparing the types of parachutes below.  Low grades can be used in lower cost multi-copter applications (also detailed further below).

Size/weight/performance details are shown below for alternatives for UAV’s from 4 lbs MTOW to 450 lb MTOW:

Parachute details



Skygraphics has just launched a new rescue chute for the multi-copter market called PROTECT UAV™ Nano.  This application is more cost sensitive so there are three types of parachute alternatives as shown below:

Chute types




  • Weight incl. Basic 90 – 127 gram
  • Weight incl. Circular 0.4 ML – 135 gram
  • Standardized adapter
  • High quality carbon fibre tube
  • Internal opening mechanism
  • MTOW up to 2kg
  • PROTECT UAV™ Nano can be used as
    pilot chute system for rescue chutes
    up to 28kg MTOW UAVs

You can find out more info about these solutions by visiting

Key UAV News for the Week:

Industry Events for MAY:

  • Xponential 2016 – May 3-5, New Orleans, LA,
  • 2016 SOFIC (Special Operations Forces Industry Conference) – May 23-26, Tampa, FL,

Quote for the week:

“The human spirit is like an elastic band.  The more you stretch, the greater your capacity.” Bidemi Mark-Mordi.

UAV Propulsion Tech is unmanned aerial vehicle (UAV) hardware solution provider of propulsion, servo, autopilot, rescue/recovery parachutes, electric turbofans, pneumatic launchers, capacitive liquid level sensors, engine sensors and gyro-stabilized EO/IR gimbal solutions. Click on the HOME link above or go to for more info.


UAV Propulsion Tech Post #17 – COTS UAV Engines

New Blog 17

Most UAV companies are looking for COTS (consumer off the shelf) engines that don’t require expensive R&D funding to fly.  Hirth has been around since the early 1900’s and has been designing and producing reliable 2-stroke aircraft engines for several markets including UAV’s.  They have COTS UAV engines from 8hp to 100hp to support the growing demand for this market.  This post will provide more details on Hirth’s family of COTS UAV engines and a little history on the company.

hh1Hirth flugmotoren 

History of Hirth:  Hellmuth Hirth, born in 1886 in Heilbronn, was the most successful German pilot before World War I.  When he was 18 years old, he worked as a mechanic with Edison in the USA. He returned to Germany in 1909 and joined ‘Erler’ where he helped build the first German airplanes. In 1910 he was a designer of airships at “Luftschiffbau Zeppelin” and later Hirth founded “Elektrometall GmbH” (now Mahle) which was engaged in the production of pistons, aircraft brake wheels, and air and oil filters.  He left the company to found “Hirth Motoren GmbH” in 1927. His first engine HM 60 with four inverted cylinders, crankshaft with Hirthtooth system and complete antifriction bearing application proved to be very reliable and successful in the flying competition “Deutschlandflug” in 1931.  Since 1927, Hirth Motors (now Hirth Motoren GmbH & Co. KG) has produced over 1 million 2-stroke engines for manned aircraft, hover craft, snowmobiles, water pumps, go karts, and UAV’s at their headquarters in Benningen Germany (near Stuttgart).


4103 8hp Engine

(500W starter/generator) Brochure Link


4201 15hp Engine

(1kW starter/generator, electronic throttle, optional reduction drive) Brochure Link


F33 NG 28hp Engine

(2kW starter/generator, optional reduction drive, electronic throttle)Brochure Link

F33 NG WebF33 NG

F23 NG 50hp Engine

(optional reduction drive, 2kW starter/generator, electronic throttle) Brochure Link

S1215 WebF23 NG

3504DI 60hp Water Cooled Heavy Fuel Engine

(optional reduction drive, 2kW starter/generator, electronic throttle)Brochure Link

3701 100 hp Engine

Brochure Link


UAV Customers Flying Hirth

(in the public domain)


Advanced Engine Technology


I am the US rep for Hirth so contact me if you have any questions or if you would like cost, delivery or CAD models of the the COTS engines detailed above.  PH: +1 (810) 441-1457.  Email:

Key UAV News for the Week:

Industry Events for FEB:

Quote for the week:

“Aviation is proof that, given the will, we have the capacity to achieve the impossible.”  Eddie Rickenbacker

UAV Propulsion Tech is unmanned aerial vehicle (UAV) hardware solution provider of propulsion, servo, autopilot, rescue/recovery parachutes, electric turbofans, pneumatic launchers, capacitive liquid level sensors, engine sensors and gyro-stabilized EO/IR gimbal solutions. Click on the HOME link above or go to for more info.


UAV Propulsion Tech Post #16 – Global UAV/Drone Conferences 2016

Blog #16

As we start the new year, I thought it would be good to try to put together a list of the global UAV/Drone conferences scheduled this year.  This will cover both defense and commercial conferences.  Let me know if I missed one and I can go back and update this post.


Consumer Electronics Show 2016 – JAN 6-9, Las Vegas, Nevada-USA. Consumer drone show.



US Sport Aviation Expo – JAN 20-23, Sebring, Florida -USA.  Light sport aircraft expo but also has a drone display/flight demo area.



Bahrain International Airshow – JAN 21-23, Sakhir Airbase, Bahrain – International Air Show.



China Commercial UAV Summit – JAN 21, Shanghai, China – Commercial UAV Conference.



SkyTech Event – UAV Conference & Exhibition – JAN 27/28, London, United Kingdom – Commercial UAV Conference.



TUSE – The Unmanned Systems Expo – FEB 2-4, The Hague, Netherlands.  Commercial/Defense UAV Conference.



Singapore Airshow – FEB 16-21, Changi Exhibition Centre, Singapore. International Airshow.



AUVSI’s Umnanned Systems Europe 2016 – MAR 22/23, Brussels, Belgium.  Civil/Commercial UAV conference.



Texas UAS Summit & Expo – MAR 29-31, Austin, Texas-USA. Civil/Commercial UAV conference.



Xponential 2016 – An AUVSI Experience – MAY 2-5, New Orleans, Louisiana-USA. Commercial/Defense UAV conference.



SOFIC 2016 – Special Operations Forces Industry Conference – May 23-26, Tampa, Florida – USA. SOCOM defense conference/expo.



Nordic UAS Event – JUN 1-3, Odense, Denmark. Commercial UAV conference.



ICUAS’16 – The 2016 International Conference on Unmanned Aircraft Systems – JUN 7-10, Arlington, Virginia-USA. Defense UAV conference.



Eurosatory Defence & Security International Exhibition, JUN 13-17, Paris, France.  Land and air defense conference/expo.



Farnborough International Airshow – JUL 11-17, Farnborough, United Kingdom.  International Airshow.



UAS Summit & Expo – AUG 22-24, Grand Forks, North Dakota-USA. Civil/Commercial/Defense conference/expo.



Interdrone – International Drone Conference & Exposition – SEP 7-9, Las Vegas, Nevada-USA. Civil/Commercial drone conference/expo.



The Commercial UAV Show – OCT 19/20, London, United Kingdom. Civl/commercial drone conference/expo.



Unmanned Systems Defense – OCT 25-27, Arlington, Virginia-USA. Defense UAV conference.



Commercial UAV Expo – OCT31-NOV 2, Las Vegas, Nevada-USA. Civil/Commercial drone conference/expo.



International Drone Expo – DEC 9/10, Los Angeles, California-USA. Civil/Commercial drone conference/expo.

Key UAV News for the Week:

Quote for the week:

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UAV Propulsion Tech Post #15 – The Advantages of Commercial UAV Autopilots over Open Source Alternatives

#15 Blog Post

I am the US rep for MicroPilot and market their autopilots to US UAV customers.  I have permission from MicroPilot to re-print a white paper that is on their website titled “The Advantages of Commercial UAV Autopilots over Open Source Alternatives” authored by Sarah Vallely in 2010.  I think this white paper is more relevant today as the commercial market is trying find low cost autopilots that meet demanding performance and reliability requirements.

The Advantages of Commercial UAV Autopilots over Open Source Alternatives

White Paper by Sarah Vallely from MicroPilot

Small and large scale businesses are switching to open source software solutions (OSS) to create anything from application platforms to databases. Although OSS enthusiasts reap benefits in a variety of industries, devices that run on OSS can cause complications when installed in unmanned aerial vehicles (UAVs). Some of the key challenges UAV manufacturers face when incorporating OSS into their products are inadequate customer support, orphaned products, and less reliable systems.

OSS companies approach business differently than commercial companies. Their support is limited or nonexistent and they often lack funding for high-dollar yet necessary equipment. Moreover, OSS projects, although well intentioned, are often abandoned because developers are no longer available to support the products they design. UAV customers require high-reliability autopilots to safely carry out sensitive flight missions and transport valuable payloads. Therefore, customers and vendors alike seek out consistent and reliable products. Aviation OSS-based solutions often do not fit this bill.

MicroPilot, world leader in miniature autopilots for UAVs, gives its customers the best of both open source and commercial worlds. While some UAV autopilot vendors sell autopilots in a black box, MicroPilot autopilots provide open architecture. With this format, customers know exactly what is going on inside their autopilots. Consequently, UAV manufacturers can make intelligent decisions about how they design their airframes. In addition, its customers are not dependent on a UAV autopilot vendor to set up their unmanned vehicle. Nor do they need to pay for a vendor technician to come onsite each time a modification needs to be made.

Moreover, MicroPilot’s customers do not have to reveal proprietary information. In fact, MicroPilot does not need to ever see their customers’ vehicles. Lastly, open architecture gives MicroPilot’s customers the ability to differentiate their products. MicroPilot autopilots offer a wealth of features, which their customers innovatively combine to extend value to their end users.

On the subject of proprietary information, the two most common open source licenses are GNU General Public License (GPL) and GNU Lesser General Public License (LGPL), both of which state that any modifications made to the source code become public domain. The two most popular opens source autopilots both are licensed under (GPL); therefore, any attempt to modify the operation of these autopilots, in order to differentiate its functionality, for example, will be made available to the customer’s competitors. On the other hand, when customers use an open architecture autopilot, such as those made by MicroPilot, customizations remain the customer’s property.

Commercial UAV Autopilot Vendors Provide Comprehensive Technical Support and Service

Quality service is what concerns buyers the most when deciding whether to purchase a commercial or OSS product. Sixty-five percent of enterprise software customers polled said they prefer commercial software over OSS because of inadequate OSS service.  (Matt Asay, Why choose proprietary software over open source? Survey says! October 2007;  Although, OSS companies claim to have sufficient products, their ability to service their customers after installation is typically unsatisfactory or nonexistent.

For example, most OSS product vendors that offer technical support do not have an issue tracking system. Without this technology, much time is wasted updating staff each time a buyer contacts the vendor. Furthermore, OSS companies often cut costs by feeding tech support calls to their production development staff. This can leave customers helpless since technical questions are resolved more effectively by specialists. And unfortunately for the customer, OSS companies often save money by employing a small support staff.

When OSS support is nonexistent, UAV manufactures must rely on Internet forums for tech support. In this case, all details pertaining to a buyer’s technical issues are out in the open for anyone to read. As a result, customers and vendors both risk exposing critical details and privileged secrets to their competition when they use public forums for technical support. Although, this approach works for universities and people designing UAVs for recreational purposes, it is less than optimal for commercial UAV manufacturers.

Additionally, many OSS autopilot vendors do not provide training material such as user manuals and prototype manuals (used to create custom end-user manuals). In contrast, MicroPilot offers full training programs, both offsite and at the MicroPilot Test Facility.

MicroPilot is also fully committed to its customers before, during and after a sale. Qualified technical staff can be reached by telephone or email during regular business hours. Furthermore, MicroPilot relies on issue tracking to better serve their customers. It also employs a separate and well-trained technical support staff who supports customers without divulging critical information.

With a wealth of customer support staff, MicroPilot is equipped to fill customer requests for onsite technicians. “At MicroPilot, we make it a point to confirm customer satisfaction and ensure procedures are in place to preserve our customers’ anonymity,” says Howard Loewen, MicroPilot President.

Commercial Autopilot Vendors are Generally More Established than Open Source Alternatives

Much time is needed to configure an autopilot for a UAV airframe. This includes rewiring harnesses, qualifying settings, flight testing, adjusting manuals, and configuring the autopilot to work with other flight systems. Due to the nature of the open source movement, UAV autopilots not bought up by a commercial company are often abandoned. The developers who originally conceived the design either move on to new projects or are hired by another company.

OSS companies are also often new ventures. If a manufacturer’s autopilot vendor disappears or is no longer available to support their product, buyers might be forced to switch their autopilot technology, or at the very least, required to take over maintaining their autopilots. On the other hand, MicroPilot has been supplying UAV autopilots for 15 years to 600 clients in 60 countries.

Moreover, no OSS UAV autopilot vendor is certified by the International Organization for Standardization (ISO). The ISO audits and registers companies, especially manufacturers. ISO 9001 certification establishes that companies maintain robust business processes, keep proper records and undergo audits.

MicroPilot uses a fine toothed comb to ensure all aspects of their company abide by the highest standards. In fact, MicroPilot is ISO 9001:2008 certified. MicroPilot is the only UAV autopilot vendor awarded with this ISO 9001 certification in the design and production of UAV autopilots and related accessories. This certification also guarantees quality checks. MicroPilot diligently identifies defects and takes corrective action where necessary.

Commercial UAV Autopilot Manufacturers Generally Invest in Production more than Open Source Companies

Although the open source model may work for nonprofessionals, most UAV manufactures cannot sufficiently fill their needs with OSS autopilots. OSS autopilot manufacturers, for the most part, do not have the capital to invest in production. Such investments include overnight build process tools, calibration, automated assembly, and simulation tools.

Error Checking Tools
Overnight processes ensure errors from the previous day are caught quickly. MicroPilot’s overnight build process compiles its entire code base nightly, and its overnight regression test performs hundreds of tests. MicroPilot also employs a static code analysis tool, which looks for specific types of errors. And it uses logic analyzers during testing to observe digital systems.

Automated Calibration
During production, sensor calibration eliminates varying signals and temperature. Although, some manufacturers calibrate their equipment by hand, automated calibration is quicker and more accurate. Because a computer automated process does not forget steps, it makes more accurate measurements.

Furthermore, automatically testing the functionality of a dozen or more boards, simultaneously, allows vendors to cope with peaks in demand. Automated calibration solutions are costly; however, they cannot be excluded. MicroPilot has invested almost a million dollars in automated calibration solutions and relies on calibration technology to further improve the quality and throughput of its production process. In addition, MicroPilot recently added a $300,000 multi axis rotation table with a built-in temperature chamber to its production line.

Motion Simulation
Figure 1: Two-Axis Motion Simulation Table System by Ideal Aerosmith

MicroPilot is a commercial company with a business model that ensures significant investment in tools and equipment. The OSS business model is quite different. Although, few upsides exist for buyers, such as lower pricing, the commercial model produces a different end product due to the tools and equipment used to produce their products.

Simulation Tools
Simulation tools are another investment many OSS UAV autopilot manufacturers are not able to make. This is an important factor to consider as simulators are invaluable tools autopilot companies use to develop reliable and safe products. Software in the loop (SIL) simulation tool links autopilot code to a flight simulator. MicroPilot has used an SIL since its inception more than fifteen years ago. With this tool, the entire system is tested on a single computer. SIL and quasi hardware in the loop (qHWIL) simulators provide valuable training tools for MicroPilot’s customers.

TrueHWIL simulators take simulation to an even higher level. “Unlike existing qHWIL simulators that use a serial communications port to transmit sensor information to the autopilot, the trueHWIL uses analog-to-digital converters to electrically simulate all sensor signals,” reports Vitaliy Degtyaryov, lead developer of MicroPilot’s trueHWIL. “This tool provides the highest possible simulation fidelity, since the exact same code executes in the simulated autopilot as in the real autopilot.” The trueHWIL gives MicroPilot customers access to a validation tool that is unmatched in the industry.

Insurance Coverage
Essential insurance coverage is one more cost many OSS UAV autopilot manufacturers often forgo. If an autopilot vendor goes out of business because they could not afford to defend themselves against a lawsuit or recover from a fire, the buyer is left with an unsupported autopilot. In this event, UAV manufacturers are often forced to switch autopilot vendors, costing them time and money. MicroPilot holds operational liability, product liability, insurance for loss of business assets/inventory and business interruption insurance.

High-Tech Commercial Products Keep UAV Manufacturers Competitive

MicroPilot’s fifteen years in the UAV autopilot industry and technological advancement allow them to help their clients’ stay competitive. For example, time-to-market is critical. OSS autopilot manufacturers may not be able to roll out products for UAV companies quickly enough. Many issues can hold up OSS UAV autopilot manufacturers. One being, finding replacements for obsolete components. Time is of the essence; therefore, waiting for parts for an uncompleted UAV might leave UAV manufacturers’ customers going elsewhere. Because of MicroPilot’s years of experience, they have the know-how to deal with obsolete components.

OSS UAV autopilots’ circuit boards typically have RAM and flash memory installed directly on the microcontroller chip. Although this simplifies the design of the circuit board, it limits the amount of RAM to a few kilobytes. This limited RAM may be sufficient for flying an aircraft autonomously; however, it is not enough memory to accommodate all the features used in a typical UAV. In contrast, MicroPilot UAV autopilots contain many megabytes of both RAM and flash. Separate RAM and flash chips are installed outside the microprocessor.

MicroPilot sets the technological benchmark in the UAV autopilot industry. In fact, MicroPilot was presented with the All Star Award for Excellence in Technological Innovation by the Manitoba Aerospace Association.

UAV Manufacturers Count on MicroPilot for their Autopilots

UAV manufacturers who experiment with OSS-based autopilots are often stuck with inadequate customer support, orphaned products, and less reliable systems. Choosing a stable commercial company with superior technical support saves UAV manufacturers costs in the long run. MicroPilot, established in its industry as the leading UAV autopilot vendor, hires experienced personnel. Moreover, MicroPilot fills its orders reliably and on time, with the help of automated calibration. Finally, its state-of-the-art development, production, and testing facilities serve numerous satisfied clients worldwide. UAV manufacturers count on MicroPilot.

About MicroPilot

MicroPilot has been developing and producing autopilots for over 20 years.  With 850 clients in 70 countries, MicroPilot is the world leader in miniature autopilots for UAVs. MicroPilot offers a family of autopilots weighing 28 grams that can fly fixed-wing, multicopters, transitional and helicopter UAVs.  MicroPilot’s low cost MP2128HELI2 flies helicopters, VTOL and fixed wing aircrafts. For triple redundancy, MicroPilot produces the MP21283x.  MP-trueHWIL Matlab-based hardware in the loop electrically simulates all sensors, providing the highest fidelity autopilot simulation available.  For more information check out my MicroPilot page at

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“Never tell people how to do things. Tell them what to do, and they will surprise you with their ingenuity.” George S Patton.

UAV Propulsion Tech is unmanned aerial vehicle (UAV) hardware solution provider of propulsion, servo, autopilot, rescue/recovery parachutes, electric turbofans, pneumatic launchers, capacitive liquid level sensors, engine sensors and gyro-stabilized EO/IR gimbal solutions. Click on the HOME link above or go to for more info.



UAV Propulsion Tech Post #14 – 2015 Year in Review

#14 blog post

I thought it would be good to close out the year with highlights and news from the various companies represented by UAV Propulsion Tech here in the US.  These include Orbital, Volz, Hirth, MicroPilot and Skygraphics.  It has been a busy and productive year, and thought it would be good to highlight the key items from the year.  I will try to summarize by company.

micropilot slider


2015 news


Hirth COTS engine matrix













  • Hirth focuses on providing COTS (consumer off the shelf) engine solutions to global UAV customers.











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UAV Propulsion Tech Post #13 – UAV’s Spotted at Dubai Airshow 2015

Blog post #13

UAV’s Spotted at the Dubai Airshow 2015:

I attended the Dubai Airshow for the first time this year and walked the show with one of my colleagues from Hirth Motors.  The purpose was to check out the show to see if there were any potential UAV customers (for propulsion, servo, autopilot and rescue/recovery parachutes), and to see if we wanted to exhibit in the future.

I visited the show the day it opened and it took about 45 minutes to get into the show using the “pre-registered” line.  They had tight security where everyone had to go thru metal detectors and assume this was part of the delay.  I am OK with this level of security to make sure that the event was safe.  I am sure it is also due to some of the VIP’s in attendance.  The first day HH Sheikh Mohammed bin Rashid Al Maktoum (head of the UAE) was walking the show with his entourage.

The show had a large 3D printing area and Stratasys had a 3D printed jet powered UAV developed by Aurora on display.  This UAV had lots of press coverage during the show and I saw several articles about this unique UAV.  Apparently ~80% of the air vehicle is 3D printed (including fuel tank).  It has a 9ft wingspan, weighs 33lbs and can fly at 150mph. Glad to see that one of the coolest UAV’s at the show was from the USA.  Here is the video they were showing at the stand with more info: YouTube 3D Printed UAV Video.


Figure 1: Aurora/Stratasys 3D Printed Jet Powered UAV

UAV Factory also had a booth and had their Penguin UAV on display.  They also had their ground station active and were flying a UAV in Latvia from the show.  They did the same demo at AUVSI which was pretty impressive.   They are also promoting their EFI gasoline engine, launcher, GCS and most recently started offering payload accidental damage insurance.  I didn’t get a picture of their booth but have shown a stock photo below from their website.


Figure 2: UAV Factory Penguin w/launcher

There were several US companies that had UAV’s on display.  Textron/AAI had their Aerosonde and Shadow M2 UAV’s on display inside a building on the runway.  Boeing had the Scan Eagle on display and Lockheed had their new Indago VTOL multicopter on display.  General Atomics had their Predator on display.  I see in the press they are starting to get orders for their Predator XP to UAE.  I won’t cover the US companies much within this blog because I wanted to highlight some of the new stuff I haven’t seen before.

ADCOM Systems from Abu Dhabi had a large UAV display on the runway showing some of their Medium Altitude Long Endurance (MALE) UAV’s, as well as a VTOL helicopter and a target drone.  You can find out more at their website:


Figure 3: ADCOM Systems UAV’s

I have seen the Piaggio P.1HH Hammerhead in the news but this was the first time I have seen one up close.  Very impressive.  This UAV is based on the Piaggio P.180 Avanti II Business aircraft which has been in service for over 20 years with over 800,000 flight hours.  It is noted on their website as a “Super MALE” because it operates at the top end of the MALE requirements.


Figure 4: Piagio Aerospace P.1HH Hammerhead

The Chinese were also represented at the show.  AVIC which is Aviation Industry Corporation of China had a booth inside the expo hall but focused more on their manned aviation offerings.  I have seen pictures from other shows where they have a “Predator” clone called Wing Loong but this wasn’t at the Dubai Airshow.  They did show their FC-31 fighter jet which looks very similar to the US F-35.


Figure 5: AVIC FC-31 fighter jet

I also saw a Chinese VTOL that was on display outside.  It was noted as a CATIC TD220ME which is a 300kg MTOW VTOL using a 65hp piston engine and has 5hr endurance.  CATIC is China National Aero-Technology.  I did a search on this UAV and also found it listed under: Beijing ZhongHangZhi Technology Company as TD220.


Figure 6: CATIC TD220ME VTOL from China

A more high tech (and nicer looking) VTOL was also on display outside from Augusta Westland.  Their SD-150 Hero is a JV with IDS-Ingegneria Dei Sistemi Corporation and Augusta Westland operating as Sistemi Dinamici in Italy.  Very nice VTOL.  You can find more info

SD-150 hero

Figure 7: SD-150 from Sistemi Dinamici

I saw an interesting UAV from Lebanon called the Skypro V200 UAV.  It is a 5 kg electric UAV that is hand launched,  has a 3hr endurance and is recovered via parachute.  You can find out more here:


Figure 8: SkyPro V200 electric UAV

Denel out of South Africa had a booth inside the expo hall and I was hoping they would have their Seeker II on display but they didn’t.  They did however have their Hungwe II on display.  This is a 35 kg MTOW air vehicle that is catapult launched and has skid landing.  Wingspan is 4m, ceiling is 12,000 ft. and endurance is 6hrs.  You can find out more here:


Figure 9: Denel Hungwe II UAV

OK, not a UAV but I love this jetpack from Martin Jetpack out of New Zealand.  It uses twin ducted fans and a 2.0L V4 2-stroke producing 200hp.  Very impressive.  Not a UAV but you could definitely make it a UAV.  You can find out more at:


Figure 10: Martin JetPack

Very interesting airshow but not as many UAV exhibitors as I had hoped.  The UMEX show in Abu Dhabi in March 2016 would be a better show since this is focused on UAV’s.  I may try to attend that event next year.  You can find more info at:


I thought I would close with a photo of me touring some of the AirBus aircraft.


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UAV Propulsion Tech Post #12 – Robots in the Sky – Cracking down on Drone Law

Info Graphic developed by Intella Blog.  Posted with permission.

Robots in the Sky: Cracking Down on Drone Law (via Intella Blog)

Robots in the Sky: Cracking Down on Drone Law

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UAV Propulsion Tech – Post #11 – UAV Engine Suppliers

UAV Engine Suppliers (UPDATED NOV 27, 2017):

Full disclosure at the front of this blog is I represent AeroSteyr/Hirth and they will be detailed in this list as well as my competitors in this market.  Some people may think I shouldn’t promote my competitors but I think it is good to highlight the options available in this market.  Each supplier has their own advantages and disadvantages and it all depends on what the UAV manufacturer needs.  Some want an off the shelf solution while others are looking for a custom solution designed around their requirements.  Some want to run on gasoline and some want to run on heavy fuel (Jet A, JP5, JP8).   You combine the size, weight, power, noise, fuel consumption, and cost requirements and it can be a real challenge to find a consumer off the shelf (COTS) solution.

I am going to supply a list below with some general info on the suppliers as well as their website links where you can go to get more info.

Hirth Motors – Stuttgart, Germany – and also on my website at

General Info: Hirth produces 2-stroke, air cooled and water cooled UAV engines from 8hp to 100hp that are flying on several global UAV platforms.  They have gasoline and heavy fuel solutions, and provide complete propulsion modules including starter/generators and engine mounts.  To date they have delivered over 1 million 2-stroke engines.

NWUAV – McMinnville, OR USA –

General Info: NWUAV has been producing small UAV engines for the SUAS market and according to their website they have built thousands to date.  They now also have their own COTS 44cc engine they are marketing to global customers and are developing a new 88cc boxer variant.  They have relationships with other engine companies to market their engines like: RCV Engines, Rotron, Compact Radial and they are also a Rotax service center.

UAV Engines Ltd. – Kent County, UK –

General Info: UAV Engines Ltd. (UEL) produces air cooled and water cooled rotary engines from 38hp to 95hp.  Their engines are used on the AAI Shadow 200 and several other global UAV platforms (too many to list).


Rotron UAV – Semley, UK –

General Info: Rotron produce water cooled rotary engines in the 32-56hp range (gasoline and heavy fuel).  They were recently chosen by CybAero for their VTOL export to AVIC.

Advanced Innovative Engineering (AIE) – Lichfield, UK –

General Info: AIE is relatively new to the rotary UAV engine market but their technology has heritage back to Norton with some advanced technology for cooling to resolve some of the performance/reliability issues of standard rotary engines.  They have 4 engine sizes from 5hp to 120hp.

Austro Engine – Wiener Neustadt, Austria –

General Info: Manned aircraft engine supplier or rotary and piston aircraft engines.  They produce a 170hp Jet A1/Diesel piston engine, 180hp Avgas engine, and a 54hp rotary.  The rotary is used by some UAV applications.

3W International – Bad Homburg, Germany –

General Info: 3W is a large supplier of small air-cooled 2-strokes into the RC market so they have a large selection of various engine alternatives that can be used in SUAS applications.  This is the place most companies go to in the early stages of their UAV development if they are looking for a COTS solution and they have a tight budget.  They also have heavy fuel engines and launched a new rotary in 2017.

Power4Flight – Hood River, OR USA –

General Info:  Power4Flight markets Currawong EFI systems so originally started by adapting this to existing RC engines from DA and 3W.  They offer 29cc and 60cc variants using this approach.  They are also teamed with Cobra Moto to develop a 33cc COTS engine under the Cobra Aero brand.


UAV Factory – Jelgava, Latvia and Irvington, NY USA –

General info:  UAV Factory is well known for their Penguin UAV which flies their own 28cc EFI engine.  They develop and produce their own UAV, engine, launcher and ground control station.  They also sell this engine as a turn-key solution to other UAV manufacturers.


HFE International – Tucson, AZ USA –

General Info: HFE International applies Currawong EFI systems to Desert Aircraft engines.  They offer a 100cc, 120cc and 170cc engines on their website.


Rotax – Gunskirchen, Austria –

General info: Rotax is well known for their certified aircraft engines for small manned aircraft and these same engines are used in larger UAV’s.  They are 4-stroke, FAR certified and run on gasoline.  100hp naturally aspirated and 115hp turbo charged.


Jabil/xRDi – St. Petersburg, FL USA –

General Info:  Jabil is marketing the xRDi UAV engine that utilizes Piaggio FAST mechanical air blast injection technology to ignite heavy fuel.  They have displayed engines from 75ccc to 530cc at AUVSI in the past.


UL Power Aero Engines – Leper, Belgium –

General Info: 4-stroke, 4-cylinder and 6-cylinder manned aircraft engines from 97hp to 200hp with electronic ignition and fuel injection.

Continental Motors – Mobile, AL – USA –

General Info: Well known 4-stroke manned aircraft engine manufacturer of gasoline and diesel engines.  Engines are also used in UAV’s.  Company is owned by AVIC International out of China.  They also purchased assets of Thielert Aircraft Engines GmbH in 2013 and market their diesel aircraft engines under Technify Motors GmbH.  Here is the link to Technify.

Lycoming – Williamsport, PA – USA –

General Info: Another well known manned aircraft engine manufacturer owned by Textron (owners of Cessna).  They produce mainly 4-stroke gasoline engines for the manned aviation market but have produced some engines for UAV’s (big and small) including the 2-stroke spark ignited heavy fuel EL-0005 for Textron Unmanned Systems Aerosonde Mk4.7.

I am sure I didn’t get them all so please email me at to let me know what I missed.

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UAV Propulsion Tech is unmanned aerial vehicle (UAV) hardware solution provider of propulsion, servo, autopilot, rescue/recovery parachutes, electric turbofans, pneumatic launchers, capacitive liquid level sensors, engine sensors and gyro-stabilized EO/IR gimbal solutions. Click on the HOME link above or go to for more info.