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Elec-Helicopters New or Limited Activity
Ark › X400 and himax 2025-4200
12-03-2005 04:51 PM  12 years agoPost 1
xurifle06

rrNovice

Glocester, RI

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Hi i was just wondering if i could run this heli with a himax 2025-4200. thanks for the help.

Rich

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12-03-2005 05:39 PM  12 years agoPost 2
skeppley

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Auburn PA

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Beleive it or not, it will be fine for sport flying. Dont expect a super high headspeed, or lots of power, but basic flight will be fine. I flew one in mine for a month or so until i upgraded to a Neu 1105 and a JGF 450TH.
Be sure to run a heatsink on it too..

Shane

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12-03-2005 05:50 PM  12 years agoPost 3
skeppley

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Auburn PA

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You will probably want to run it with an 8 tooth and your throttle almost maxed out. You could use a 9 if the Headspeed is too low, but it will probably heat up the motor a bit. Try the 8 first and see how she flys.

Expected headspeeds:

138 main /8T pinion = 17.25 : 1 ratio
4200kv motor x 11.1v = 46620 max rpm
46620 / 17.25 = 2702 rpm on the head (w/o calculating ~10% loss)
2702 x .9 = 2431 rpm of true headspeed after losses w / 8T

138 main /9T pinion = 15.3 : 1 ratio
4200kv motor x 11.1v = 46620 max rpm
46620 / 15.3 = 3047 rpm on the head (w/o calculating ~10% loss)
3047 x .9 = 2742 rpm of true headspeed after losses w / 9T

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Ark › X400 and himax 2025-4200
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