KAHULUI, Hawaii - Ampaire has completed a demonstration flight of a hybrid-electric aircraft along an actual airline route. The company flew its Electric EEL aircraft on November 22nd on a 20-minute flight from Maui’s Kahului Airport across the island to Hana and back on a single charge.
Ampaire is now flying the route regularly in a one-month demonstration program with Hawai‘i-based Mokulele Airlines, one of 15 airlines to have signed a Letter of Interest with the company. It is the first use of a hybrid-electric aircraft under the FAA’s Experimental-Market Survey category, allowing Ampaire to fly with their crew and essential personnel for crew training and other exploratory market activity. The flight trials are supported by Elemental Excelerator, a global climate-tech accelerator.
“We’re following the successful path of hybrid-electric automobiles in transforming ground transportation by taking that model to the sky, ” said Ampaire CEO Kevin Noertker. “By upgrading current aircraft with hybrid-electric propulsion we can enter the market quickly and take advantage of existing infrastructure for fixed-wing aviation.”
The trials serve two purposes, according to Noertker: demonstrating electric aviation’s potential to reduce harmful emissions and evaluating the robustness of Ampaire technology. “We can take lessons from this series of flights and apply them to subsequent, larger aircraft designs already in the works.”
The Electric EEL technology demonstrator used in the Mokulele trials is an upgrade of the popular six-seat Cessna 337 twin-engine piston aircraft. The aircraft has a 300-horsepower piston engine in the rear and a 160 kW-capable electric power unit in front, plus a battery pack carried in an under-fuselage aero-optimized shell. Due to the contribution of the electric power unit, fuel consumption and CO2 emissions are reduced by approximately 40-50 percent.
For the flight trials, the only change to ground equipment was the requirement to wire a Mokulele hangar with a 208-volt 3-phase outlet. Ampaire has been working with the Hawai‘i Department of Transportation and the Hawaiian Electric Company to explore longer-term infrastructure solutions to support a fleet of hybrid- or fully-electric aircraft.