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02-09-2006 05:57 AM  12 years agoPost 1
stickjammer

rrApprentice

Fort Plain ny

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i just installed a o402s brushless motor,the parer i got with it says it is a 3600/v,efficienty 15t upper 85%.it has a 10 tooth pinion but the head speed is quite high,how can i lower it.i am curently using the stock tx but will be using my 9c.so what way do i go with the pinion up or down?

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02-09-2006 06:05 AM  12 years agoPost 2
Martin_gsxr

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Toronto

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Hi stickjammer,

(3600kv X 11.1v) / (140t/ 10t) = 2854rpm X 80% = 2283rpm

If you want to lower the final Rpm, you have to put a smaller pinion.

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02-09-2006 06:11 AM  12 years agoPost 3
stickjammer

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Fort Plain ny

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i have put on a humming bird one way gear and hub so will a 9 or an 8 tooth do the job.i have both that i took off the 370 motors for the blade.

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02-09-2006 07:51 AM  12 years agoPost 4
Martin_gsxr

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Toronto

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Hi stickjammer,

I will have soon a 3600 Himax and will put a 9t. for 2000rpm but since you have both 8 and 9t. you can try them both..

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02-09-2006 04:27 PM  12 years agoPost 5
stickjammer

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Fort Plain ny

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i just tried a hi max 5400 with a 9 tooth and it still has a high head speed,i do not have a 8 or 9 tooth for the other motor.and i noticed the motor gets quite warm after a few min of hovering.

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02-09-2006 06:03 PM  12 years agoPost 6
Martin_gsxr

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Toronto

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stickjammer with 5400kv, you will need a 6 or 7 t maximum or your heli wont take it... unless you have a computer Tx..

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02-09-2006 11:58 PM  12 years agoPost 7
stickjammer

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Fort Plain ny

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i have a 9c i will be using so what if i put my 3600 back in what pinion should i use?

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02-10-2006 04:53 AM  12 years agoPost 8
akerkhof

rrApprentice

Indianapolis, IN

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Yeah, I don't know that you could tame that 5400kv with even a 7T pinion, and as hard as its been for guys to get ahold of 7T (had to order overseas!) I don't know that you could get a 6T.

Also, the formula's don't seem to work in my case. I have a himax 3600 with an 8T running a confirmed 2380 on optical tach. With 9T it was in the 2890 range. Good rule of thumb, but you won't know until you get it together and see what you have.


-- Aron in Indiana -- http://www.neolith.org/cp2 -- Honeybee CP2 Resources

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02-10-2006 12:46 PM  12 years agoPost 9
Awais

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Mississauga, Ontario - Canada

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stickjammer, maybe you can try the 5400 using a 2s pack. I don't know if it will work. It'll probably need a good 2s pack.

5400 * 7.4 * 9 / 140 * .8 (for effciency) = about 2055rpm

For 3600kv motor I think the best pinion is 8T.

Awais

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02-10-2006 08:59 PM  12 years agoPost 10
nuts4rc

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Vancouver, Wa USA

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I agree with Awais that the best pinion is the 8T that will allow you to run the motor itself at a higher RPM. Any time you run the motor on less than 90% you are adding heat and not giving the motor the chance to build up all of the torque that it can to run efficiently. So with the 8t you are going to get about 2200 RPM which is still a little fast but if you reduce it to 90% it is 2055 which is just about right.

Good Luck

Thanks Russ. This is Addictive! Blade CP AEK 7CHP and a Shogun V2 now

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02-10-2006 10:18 PM  12 years agoPost 11
akerkhof

rrApprentice

Indianapolis, IN

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On a related topic, do you know why they say you cannot cut the wires running off a brushless motor? What if a situation demanded it? As in, a piece of wire broke off in the connector during a crash? Are you just screwed in this case?


-- Aron in Indiana -- http://www.neolith.org/cp2 -- Honeybee CP2 Resources

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