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Date: Wed, 15 Jun 2005 09:09:45 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: planetary gear ratios
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Tracy Crook wrote:

> The formula is not the same for both locked ring gear and locked 
> planetary gear.   This formula is for the locked ring gear and you 
> probably have the locked planetary.  Remove the 1 from the equation 
> and it will come out right for yours. 
>  
> Tracy (making a lot of assumptions about your drive)
>
>     I ran across some information in one of the scientific newsgroups
>     on how
>     to calculate the gear ratio of a planetary gear set.
>
>     ratio = 1 + r / s
>
>     where: r = number of ring gear teeth
>                s = number of sun gear teeth.
>

The ring gear is actually locked.  The ring gear is pressed into the 
housing.

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