[2] Sonex designed this aircraft as a part of an attempt to develop alternate fuels, to ensure feasibility of inexpensive sport aviation in the future.
The airframe was developed from the Xenos, and was not intended to compete with the other aircraft in the Sonex line.
[2] The initial flights, however, have used a Waiex airframe, and were centered around testing the electric power system.
[1] The aircraft was to be aluminum riveted, and features were to include a shortened wingspan and tail tips (in relation to the Xenos), aerobatic wing tips, 8' flaps instead of spoilers, and for the center of gravity, an auxiliary battery and controller in the tail cone.
[6] As of 2007, the brushless DC-Cobalt motor was designed be very lightweight, at only 50 lb (23 kg), to operate at 90% efficiency, and to use Lithium-ion and Lithium-polymer batteries.