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Maxir SE, Phoenix 10 and AXI 2208/20

Old 05-03-2008, 02:25 AM
  #1  
angel-guardian
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Default Maxir SE, Phoenix 10 and AXI 2208/20

Hi, i am now setting up the Phoenix 10 (1.55) for brushless motor AXI 2208/20, all is targeted for Maxir SE (14/110pinion) - a 380g microheli. I wonder, what PWM setting is the best in this constellation? 11kHz or High turn outrunner only? (AXI 2208/20 turns a 1820rpm/V) Thank you, Libor.
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Old 05-03-2008, 06:06 AM
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Kai_Shiden
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11Khz, high timing, 100% fixed throttle, do yourself a favor and go to a 15 tooth pinion now...

The 14 tooth plastic pinions tend to blow out under the load of an Axi 2208/20 on 3cell, where the 15 tooth can handle a >200W 4cell setup:

Proof that a 15 tooth can handle 4s power:


-Kai

P.S. With a little work it's not too hard to get a Maxir down to sub 360gr with TP1320 packs . Oh, and this should be in the Micro Sized Electric Helicopters sub forum.
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Old 05-03-2008, 02:23 PM
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angel-guardian
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Hi Eron! Thank you for time spent to me. Yes i know your Maxir SE indoor video, its very cool, i really like it! No, i really dont need reduce weight of the machine for now....i am a beginner, spinning the Maxir on the ground. Why do you recommend fixed throttle? Why not governor with Phoenix 10? I thought, that CC has the governor resolved or not? 15 teeth pinion? Yeah, i consider it....but for now, the machine really will be not under high load, during testing.....
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Old 05-03-2008, 09:02 PM
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Kai_Shiden
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On a PHX-10, I suggest fixed throttle, 100% preferable for sport flying and above, and nothing below 80% even for starting out (of course, lower values during spoolup is fine).

The PHX governors work fine on the larger controllers, but I've found that they are especially hard to get working right on small helis, I've run the 1.55 governor on a Maxir, anything less than full throttle and the ESC pulses a bit making tuning in the tail more difficult (I settled on using it as a rev limiter instead of governor, but even then it wasn't as good as just using fixed throttle).

The 14 tooth will last adequately for hover testing, just make sure to keep inspecting the teeth on it periodically (just a few flights before it blows, the teeth will start distorting, so make sure the tooth profiles are still symetrical).

-Kai
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