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Ernest,
Ross redrives for the early 12A/13b were 3.17-1........Lou Ross had this ratio in
a Mooney (not sure if it was 12Aor 13B) which spent at least a few hours in the
air in the late 1970's early 1980's........My question is this, is this a three pinion
planetary and have you determined it is a Ford C6 part ?? I personally would not
put a three pinion planetary on a modern 13B and fly with it !! If there is a direct
fit replacement I would choose a six pinion first or a four pinion second choice
replacement planetary.........FWIW.......I do not know tooth count for 3.17 ratio as
I have never seen one !
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2
-------------- Original message from Ernest Christley <echristley@nc.rr.com>: --------------
> 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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