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HomeAircraftHelicopterHelicopter Main Discussion › calculating gear ratio
04-02-2009 05:16 AM  9 years agoPost 1
little-1

rrNovice

usa

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can someone tell me the correct way to calculate gear ratio? for example; my r90 has a 91 tooth main gear and a 11 tooth pinion....i came up with 8.2 ...so is the correct ratio 82 on the gov? divide the main gear by the pinion right?

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04-02-2009 05:17 AM  9 years agoPost 2
Dood

rrProfessor

Wescanson

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yes.

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04-02-2009 05:22 AM  9 years agoPost 3
Dood

rrProfessor

Wescanson

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my r90 has a 91 tooth main gear and a 11 tooth pinion....i came up with 8.2
...But I came up with 8.27

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04-02-2009 05:29 AM  9 years agoPost 4
little-1

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usa

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ratios
so if i came up with 8.27 also... would i set the gov for 82 or 83?

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04-02-2009 05:32 AM  9 years agoPost 5
dkshema

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Cedar Rapids, IA

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82/83. Pick one, the difference won't be noticeable.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-02-2009 02:24 PM  9 years agoPost 6
midwestpilot

rrElite Veteran

Crystal Lake, IL

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as averages go...
8.27 is closer to 8.3 than it is to 8.2.. so I would use 8.3

In life there is no spacebar!

Rich Erikson AMA 6175

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04-02-2009 05:49 PM  9 years agoPost 7
chopper_crazy

rrElite Veteran

Delphos, Ohio

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I know ReadyHeli has a calculator on their homepage that you can use. It works very nicely.

It's a complex, costly, glow powered anti-gravity machine!

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