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Date: Wed, 15 Jun 2005 10:46:47 -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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George Lendich wrote:

>Ernest,
>If it turns counter clockwise it's the 2.17 ( you don't add the one in the
>calculations).
>If it turns clockwise it's 3.17.
>The 2.17 turns counter clockwise.
>The 2.85 turns clockwise ( looking at it from the pilots seat)
>George ( down under)
>  
>

George, if you meant to confuse me then you have done a spectacular job 8*)

Let's back up just a second.  The ring gear is locked.  The output is 
taken from a splined shaft that is driven by the planet gear carrier.  
When I turn the sun gear clockwise, the output shaft turns clockwise.  
It takes *about* 3 turns of the sun gear to get one turn on the output 
shaft.  You've said (or at least I read it that way) that this is both a 
2.85 and 3.17.  Was there a typo in there somewhere?

Kelly, I was thinking more along the lines of 8000RPM redline, with a 
7000 cruise.  That would put the prop revs at 2208, which I *think* is a 
good number.  The problem I'm having is trusting the 3-pinion planet set 
I have.  I took the gearbox to a transmission shop.  The technician said 
I was wasting money to replace it.  They use that same gearset to drive 
busses.  But I can't help but to be swayed by advertisements like item 
number #9X on this site:

http://www.transmissioncenter.net/C4_C6.htm

That's a lot of reassurance for $218 that follows all the laws of 
physics I know.  I would have switched it out already, I'm just not 
positive about which gearset I have exactly.  Does anyone know for 
certain the teeth count on the different gearsets?

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