Overall propulsion efficiency deduced from test flight data
The model was fitted with EagleTree logger V2. Parameters recorded were: altitude,,,,rpm,,,,battery volts and amps,,,,airspeed.
The flight was planned to incorporate a period of unpowered shallow glide, and a period of powered level flight, both at the same airspeed.
The efficiency calculation is based on the proposition that drag x airspeed is the same for the glide and for the level flight, and that it is equal to the power provided by gravity during the glide [=model weight times descent rate]
Overall propulsive efficiency worked out at about 20%.
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