Ampaire has accomplished the longest flight to date for any commercially relevant aircraft employing electric propulsion, in this case a hybrid-electric propulsion system.

Ampaire’s Electric EEL, a six-seat Cessna 337 twin-engine aircraft modified with an electric motor in the nose and traditional combustion engine in the rear, took off from Camarillo Airport just north of Los Angeles. Test pilot Justin Gillen and Flight Test Engineer Russel Newman flew up California’s Central Valley at 8,500 feet, landing at Hayward Executive Airport.  Straight line distance was 292 statute miles, and the route as flown 341 statute miles. Speed during the cruise portion of the 2 hour, 32-minute flight averaged around 135 mph. 


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“The mission was a quite normal cross-country flight that we could imagine electrified aircraft making every day just a few years from now,” Gillen said.

This milestone in electric aviation took place after four weeks of flight testing in the Camarillo area for this second Electric EEL test aircraft, which first flew on September 10th.  In that period, the aircraft flew over 30 hours during 23 flights, in 28 days, with 100% dispatch reliability. 

The EEL flown to Hayward is dubbed the Hawaiʻi Bird as it will take part later this year in a series of demonstration flights with Hawaii-based Mokulele Airlines on its short-haul routes.  The flight trials with Mokulele will demonstrate the capabilities of the EEL and help to define the infrastructure required for wide adoption of electric aviation by airlines and airports. These flight demonstrations will mark the first time an electrically powered aircraft has flown under an FAA “Market Survey” experimental aircraft certificate to gain real-word flight experience.

The Electric EEL can generate fuel and emissions savings up to 50 percent on shorter regional routes where the aircraft’s electrical propulsion unit can be run at high power settings, and generate savings of about 30 percent on longer regional routes such as the Camarillo to Hayward flight.

“The Electric EEL is our first step in pioneering new electric aircraft designs,” said Ampaire CEO Noertker.  “Our next step will likely be a 19-seat hybrid electric retrofit program that will lower emissions and operating costs, benefiting regional carriers, their passengers and their communities.”  Ampaire, with funding from NASA and others, is in the midst of design studies for such an aircraft based on the popular de Havilland Twin Otter aircraft.  Ampaire has named the hybrid-electric 19-seater aircraft the Eco Otter SX.


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