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Old Jun 27, 2012, 06:24 AM
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Newcastle, New South Wales, Australia
Joined Sep 2007
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So How Do They All Compare?

Summarised some data I came across today of the same model and powertrain setup flying a pylon circuit in the hands of a consistent pilot. Zero seconds is the launch if that isn't obvious and I have used the speed readings at 5 seconds and 10 seconds to indicate acceleration. The motor acceleration for all tests was ramped over a period of 8 seconds from zero to WOT to minimise wasted energy (F5D is limited to 1000 watt/minute).

Prop: GM 11x22
Speed @ 5 seconds: 215kph
Speed @ 10 seconds: 305kph
Max Speed - 40 to 55 seconds: 315kph
Mean Current Draw - 40 to 55 seconds: 64 amps

Prop: GM 10x23
Speed @ 5 seconds: 185kph
Speed @ 10 seconds: 285kph
Max Speed - 40 to 55 seconds: 315kph
Mean Current Draw - 40 to 55 seconds: 56 amps

Prop: AJ aeromodels 10.5x19
Speed @ 5 seconds: 240kph
Speed @ 10 seconds: 300kph
Max Speed - 40 to 55 seconds: 320kph
Mean Current Draw - 40 to 55 seconds: 59 amps

Prop: AJ aeromodels 10.5x23
Speed @ 5 seconds: 170kph
Speed @ 10 seconds: 280kph
Max Speed - 40 to 55 seconds: 335kph
Mean Current Draw - 40 to 55 seconds: 63 amps

Prop: Scheiber Sawtooth 12x25
Speed @ 5 seconds: 210kph
Speed @ 10 seconds: 305kph
Max Speed - 40 to 55 seconds: 342kph
Mean Current Draw - 40 to 55 seconds: 64 amps

While the sawtooth whips the others in performance, I'm not convinced I can afford to run them since they are possibly to fragile to be practical for sport flying so maybe the AJA 10x19's might be the ideal compromise of acceleration, speed and robustness that would suit me. The AJA's are about twice the weight of the Scheiber Sawtooths.
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Last edited by Peter M; Jul 07, 2012 at 06:01 AM. Reason: Tidy up
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