A new fuel cell power system recently developed by Horizon Fuel Cell Technologies (HFCT) in Singapore could increase the flight endurance of small and stealthy electric unmanned aerial systems (UAS) by as much as 300 percent.

The company says fuel cell technological advancements will bring significant enhancements to UAS, making them more effective in persistent intelligence, surveillance and reconnaissance (ISR) missions.

HFCT says its "Aeropak" fuel cell is designed for high-impact and able to operate at up to 22,000 feet (6500m) and includes refillable dry-fuel cartridges.

"Storing 900Wh of usable electrical energy and weighing just 2kg, the Aeropak provides up to four times the endurance capability of advanced lithium batteries currently in use," the company adds.

"The miniaturised power system makes it very easy to use as drop-in replacement for battery packs currently in service, eliminating costly airframe modifications.

Electric-powered UAS bring important capabilities - reduced acoustic signature, smaller size - and offer real advantages - lower acquisition cost, fuel savings - to ISR operations.

In addition to increasing flight endurance, the new fuel cell system also makes it possible for small tactical UAS to integrate more power-hungry electronic devices such as electro-optical sensors, infrared cameras and laser designators.

The new fuel cell systems can also be used to power remote ground systems and recharging stations, or even serve as an auxiliary electric power supply for larger systems, the company adds.