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Other › Ok, what tooth pitch is the main gear?
10-12-2005 04:07 AM  12 years agoPost 1
Kokamo

rrApprentice

Liberty Hill Tx

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Hey guys, I was wondering what the tooth pitch is on the main rotor gear? I want to get a different motor and I will more than likely need a different pinion gear(shaft size) too.

Can anyone help me out? I think it is a 42 pitch????? Dunno, just guessing.

THANKS!!!

Joe

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10-12-2005 05:16 AM  12 years agoPost 2
Andyn_uH

rrNovice

Calgary, AB, Canada

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Joe,

The upper main gear is 150T, 0.5mod
The lower main gear is 109T, 0.6mod
and the tail drive gear is 22T 0.6mod

I hope it will help you out.

Andy Nguyen,
Microheli.com

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10-12-2005 01:55 PM  12 years agoPost 3
Kokamo

rrApprentice

Liberty Hill Tx

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The upper main gear is 150T, 0.5mod
The lower main gear is 109T, 0.6mod
and the tail drive gear is 22T 0.6mod
Thanks for your reply but what does 0.5 mod and 0.6 mod mean?


Joe

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10-12-2005 02:56 PM  12 years agoPost 4
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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Thanks for your reply but what does 0.5 mod and 0.6 mod mean?
it's how you measure gears. there are three variables:

N=Number of teeth
PCD=Pitch circle diameter (the dia of the gear if you stripped all the teeth off)
MOD=Module---its called the Module system--essentially the height of one tooth from the PCD to the O.D.

so:

MOD=PCD/N

N=PCD/MOD

PCD=N*MOD

if it ain't broke, break it.

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