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%.
Last edited by peterangus; Dec 03, 2013 at 06:01 AM.
|Category||Thread||Thread Starter||Forum||Replies||Last Post|
|Discussion||how to test motor efficiency?||Buzzkill2||Power Systems||21||Apr 23, 2014 12:06 PM|
|Discussion||Photos, Test Flight/Test Flight, Photos?||Mode One||The Builders Workshop||15||Dec 19, 2011 10:16 AM|
|Discussion||Camera Anti Vib Mount -test flight (Dampers from CD )||guyg||Aerial Photography||1||Mar 12, 2011 04:30 PM|
|Discussion||A Goldmine of Motor Test Data from Dr Kiwi||hoppy||Power Systems||9||Jun 03, 2007 04:33 PM|
|Thrust from RPM - Test stand data for APC E series propellors||Dr Kiwi||Power Systems||185||Dec 16, 2006 11:32 PM|