
An intelligence, surveillance, and reconnaissance unmanned aerial vehicle (ISR UAV) can spend hours in the air without attracting attention, carrying sensors whose value depends on remaining stable, precise, and operational long after launch. A small vibration can affect an optical image, thermal variation can alter sensor performance, a communications fault can interrupt the flow…

Fuel cells occupy a unique position in unmanned aerial vehicle (UAV) propulsion. They are not the loudest technology on the market, but for programs where endurance is the primary constraint, their performance is a crucial factor. Where a lithium battery reaches its ceiling in minutes, a hydrogen fuel cell system can sustain electric flight…