Ken Welter wrote:

   The Ross gearbox that I had was a 3.17 to 1 and I don't think they
were the same gear set as the 2.17 to 1 but cant be for sure.
  That was the best ratio that I have run, much better than the 2.95
that I am currently running but its not practical get any lower with
the cog belts I am running.

  Ken Welter

The 2.17 takes the power from the ring gear. I think if you take the
power from the planet carries and hold the ring gear fixed you
will get 3.17 out of the same planet set. This is also how the
2.85:1 works but that is an entirely different planet set.

The one on the left is the 2.17 planet carrier and the one on the
right is the 2.85 planet carrier. The sun gear shown fits both.
So the sun gear diameter is smaller for the 2.17 giving a greater
reduction when power is removed from the planet carrier.

Paul Lamar

Ken could you give us a brief description of your setup and results. What is
your cruise, climb and max rpm? What engine mods from stock have you done
(i.e. oil pressure, rotor weight/balance, etc). I gather from other posts
you use NOX. How long is the NOX on and at what rpm. How many hours on
engine and any other comments on rpm? Also why did you prefer the 3.17 to
the 2.95?

Thanks
Graydon Woods

 
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