US electric technology company Ampaire has successfully flown a prototype of its hybrid-electric Eco Caravan.
The modified C208 is fitted with a compression ignition engine burning sustainable aviation fuel and an electric motor to provide propulsion.
The aircraft flew last Friday from Camarillo Airport near Los Angeles and flew for 33 minutes, with all systems performing as expected.
"Aviation is the hardest industry to decarbonize," said Ampaire CEO Kevin Noertker. "Fully-electric aircraft are range limited because of the weight and energy capacity ofcurrent-generation batteries. Hybrid-electric aircraft, however, can preserve the range andutility of today's aircraft.
"That is why we are focused on hybrid-electric propulsion for a series of increasingly capable regional aircraft. It's a way for the airline industry to decarbonize more quickly and also to benefit from lower operating costs."
Ampaire estimates the Eco Caravan will reduce fuel consumption and carbon emissions by up to 70%, with potential for a reduction in operating costs of 25-40%, bringing the cost per available seat mile close to that of driving a car on some routes.
"The hybrid-electric aircraft preserves the range/payload capability of the Grand Caravan, and in fact can fly farther than the Grand Caravan with eight passengers," Ampaire states. "Maximum range is beyond 1000 miles.
"The Eco Caravan's range and load hauling capability is in marked contrast to proposed all-electric, hydrogen-electric and even other hybrid-electric designs."
Ampaire believes the Eco Caravan will be the first hybrid-electric regional airliner to enter service, and is targetting 2024 for certification under a Supplemental Type Certificate (STC).