Here is another picture showing the difference between the
2.85 and the 2.17. The 2.85 is the larger pinion. If you rearrange
the 2.17 gear set you get 3.17 by holding the ring gear and take
power out of the planet carrier. I don't know why anybody with
a rotary would want to use the 1.85 version.

BTW IMHO the best way to hold the ring gear is use six drilled head
hex bolt set screws in groups of two equally spaced around the outer
housing and safety wire them.

Paul Lamar

George Lendich wrote:

Paul,
Are we thinking along the same lines i.e. using your suggested bolts like
the 2.17 toothed flange is used to hold the 2.17 planetary.
If so that a good idea, my only concern is drilling into the ring gear and
going right through the teeth.
George

Don't drill into it. Just grind a few small shallow depressions where
the set screws go.

Paul Lamar
 
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