Sun Flyer 2 completes first flight with Siemens electric propulsion motor

Bye Aerospace's electric Sun Flyer 2 successfully completed the first official flight test with a Siemens electric propulsion motor February 8 at Centennial Airport, south of Denver, Colo.

The Sun Flyer family of aircraft, including the 2-seat Sun Flyer 2 and the 4-seat Sun Flyer 4, aims to be the first FAA-certified, practical, all-electric airplanes to serve the flight training and general aviation markets. Siemens will provide electric propulsion systems for the Sun Flyer 2 airplane—the 57 lb.-SP70D motor with a 90kW peak rating (120 HP), and a continuous power setting of up to 70kW (94 HP).

Sun Flyer brings the full promise of electric propulsion to the market with safe, practical and reliable electric aircraft. The all-electric operation requires no aviation fuel and results in zero emissions and significantly lower noise pollution compared to conventional aircraft. The sleek Sun Flyer design also features enhanced speed and altitude performance with extremely low operating costs.

George E. Bye, CEO of Bye Aerospace, the developer of the Sun Flyer, said the initial flight with the Siemens motor went flawlessly. "The airplane performed exactly as planned," he said. "My thanks to the entire Siemens team for their participation as we enter this next, important flight test phase of Sun Flyer 2 with the Siemens electric propulsion system."

Sun Flyer 2's program application to the FAA was accepted under FAR 23 certification criteria in the spring of 2018. The Sun Flyer 2 prototype will conduct extensive additional flight test activities in 2019 and continue to work closely with FAA representatives on certification activities. Current flight test focus areas are propulsion system, envelope expansion and systems optimization.

"This successful test flight is a proud moment for the Siemens and Bye Aerospace teams and marks a milestone in bringing the age of electric flight to life," said Dr. Frank Anton, Executive Vice President and Head of eAircraft, Siemens. "The Siemens electric propulsion system offers a clean, cost-efficient and silent propulsion alternative to the flight training market without compromising performance or safety."