Hydrogen Fuel-cells for UAVs

As the global market for UAV systems explodes in terms of both volumes and mission diversity, Singapore-based Horizon Fuel Cell Technologies used the Paris Airshow to showcase its “Aeropak” hydrogen fuel cell for small electric UAVs in the 5–10 kg class.

The company is a leader in applied hydrogen fuel-cell technology and unveiled a high-tech fuel-cell powered hydrogen-electric car in London in mid-June. For UAV use, Horizon has devloped a dry-fuel package of very light weight and small external dimensions, incorporating its proprietary 800-gram chemical hydride dry fuel cartridge.

The Aeropak module weighs just 2 kg (4.4 lb) and provides 900 Watt/hours of energy on a re-fillable cartridge. Horizon’s figures show its system as providing an energy density double that of the best battery systems available, and up to four times greater than that of nickel metal hydride (NiMH) and advanced lithium batteries. The extra energy density is promoted as enabling the use of more power-hungry devices on-board small UAVs, in addition to extending range and payload capability.

Encased in an impact-resistant package, the Aeropak system supplies a continuous 200W/9Amp output and has been tested to operational altitudesof 22,000 feet. It can provide a short-term maximum output of 500W and is expected to provide a minimum of six hours’ endurance in a 5–10kg UAV. Horizon says it can develop an appropriate module to suit different sizes and applications, dependent on the client’s needs, and the standard Aeropak is only one example of what the technology is capable of offering.