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Old Jan 13, 2012, 12:39 PM
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Overall propulsion efficiency deduced from test flight data

BLOG 006
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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Description: Graph of flight data. date 18 Sept 2005.

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Description: Test model
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Last edited by peterangus; Dec 03, 2013 at 07:01 AM.
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