Mailing List flyrotary@lancaironline.net Message #23899
From: Ernest Christley <echristley@nc.rr.com>
Subject: Re: [FlyRotary] Re: planetary gear ratios
Date: Wed, 15 Jun 2005 09:09:45 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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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