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Old Aug 08, 2012, 08:56 PM
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Kansas, USA
Joined Sep 1999
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When RJ and I talked about this plane during the testing phase we discussed setting it up for more power and speed. This is the reason for offering the 1.9lb kit and recommending a larger motor like the 36gr or Hacker A20-34s.
I did some prop testing on these two motors and am surprised and happy with the results. I have always used an 8x4.3 with these motors but it looks like we can prop up a little more with good results.
All testing was on a 3 cell battery. My recommendations are based on short duration full throttle. If you want to fly extended time at full throttle then I recommend propping for 10a max.
Here is what I found:

Base line 2730-1500 with a 8x4.3SF is 500g thrust at 9 amps.

Hacker A20-34s---
Prop Thrust(g) Amps
8x4.3SF 600 12
8x4DD 650 12

8x6SF 600 17
9x4.7SF 700 17
9x5DD 700 17

36gr.-----
Prop Thrust(g) Amps
8x4.3SF 570 12
8x4DD 530 11
8x6SF 550 17
9x4.7SF 700 17
9x5DD 700 15


I still want to try an 8x6DD or speed prop but I need to order them.
Looks like on the Hacker the 8x4DD is a good match and on the 36gr motor the 9x5DD is the best.
Mike
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