Sun Flyer 2 is manufactured of composite materials and is powered by a Siemens electric propulsion motor.

Bye Aerospace’s electric Sun Flyer 2, with a fuselage made of composite materials, successfully completed the first official flight test with a Siemens electric propulsion motor February 8 at Centennial Airport, south of Denver, CO.

The Sun Flyer program was established in 2014 with plans to produce Sun Flyer 2, a two-seat, clean, renewable energy electric aircraft to serve the flight training and general aviation markets with full certification under the new Federal Aviation Administration (FAA) Federal Aviation Regulation (FAR) Part 23 regarding small aircraft.  Sun Flyer 4, a four-seat aircraft, is also in the plans.

In the spring of 2018, Sun Flyer 2’s program application was accepted by the FAA under FAR 23 certification criteria.

Siemens provides electric propulsion systems for 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 2’s all-electric operation requires no aviation fuel and results in zero emissions and significantly lower noise pollution compared to conventional aircraft.  The design of Sun Flyer 2 also enhances speed and altitude performance.

George E. Bye, CEO of Bye Aerospace, 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.”

“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 Sun Flyer 2 prototype will continue flight test activities in 2019 and will continue to work closely with FAA representatives on certification activities. Current flight test focus areas are propulsion system, envelope expansion and systems optimization.