The new all-electric 2-seat Flight Training Aircraft 'Sun Flyer' (which Bye Aerospace launched in 2014 and was renamed eFlyer in early 2019) rolled out the first prototype in Englewood, Colorado on March 2, 2016 at Centennial Airport. The First Official Test Flight took place on April 10, 2018, flown by test pilot John Penney, also at Centennial Airport.


Lithium Ion batteries run the electric propulsion system, which directly drives the multi-blade composite propeller. Engine performance is controlled by an electronic control unit which ensures optimal use of the energy stored in the batteries. The electric design features reduce cooling drag compared to a conventionally-powered aircraft. The nose frontal area is reduced, due to a smaller motor size and standard cooling intakes are no longer required. Propeller efficiency is improved due to the utilization of additional blade area when contrasted to an internal combustion engine aircraft.


The eFlyer uses a Siemens electric motor which is completely emission free. No Av gas with CO2 in the exhaust. Furthermore, noise associated with the operation of the aircraft is very quiet, allowing the use of airports near populated areas without local residents being disturbed by excessive noise.


The Siemens electric motor's throttle is very intuitive with one control lever.  There is no need to adjust mixture richness and monitor cylinder head temperature as in aircraft with internal combustion engines. The throttle computer control unit is responsible for optimum motor operation. Battery status, the power system, and all necessary information is displayed on the digital avionics panel.


The operating costs of the  eFlyer are almost six times lower than the costs associated with similar training airplanes equipped with fuel-burning internal-combustion engines.  The  eFlyer uses only $3/flight hour of electricity.

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