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Old 03-12-2012, 01:24 PM
  #1415  
Velco
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Default RE: ESM FW D-9


ORIGINAL: Corsair 29


ORIGINAL: Velco



After talking a bit to Mirce I figured out that 50% more static from flying weight is really not necessary so I have come up with one more interesting solution for Rim 65cc on 12S (or any other motor with kV around 170 like AXI 5345/18) which is also more scale especially on Dora and it is Biela 3 blade 20x14. Would really look nice painted in black.

This is also quite interesting as well. Does ecalc show you what the current draw is on the 3 bladed prop at 100% throttle verses a 2 bladed prop? Obviously there will be more current draw for more load, which may require a larger battery pack(mah).
OK here are the numbers from ecalc for Rimfire 65cc on 12S, beased on APC-E props with +/-10% tollerance

21x14: 88A, 15,5kg, 147kmh
22x14: 102A, 17,3kg, 145kmh
20x14 3 blade: 98A, 16,7kg, 146kmh

I have to say that all the values on all the props fall withing the Rimfire 65cc specification and that 20x14 3 blade can be considered as an "ideal" prop for this combo because in that case the motor is achieving its theoretical max efficiency of 93,5%! I have to admit that this motor looks to be a real winner on any 50CC WW2 plane also because of its weigth which can deffinitively help balancing the modell corectly without any lead.

As there is no good Do 335 thread (at least I could not find it) I have some interesting options for that modell too as I consider the suggested 2 Eflite160 on 10S and 20x10 completely unnecessary and the plane sounds very bad with those props spinning at such high revs.

A question from my side, which way to go, Benedini or Model Sound Inc way? Some pro and contra from the filed would be nice.

Velco