Hi Paul
Here is my solution to redesigning the Ross drive. After taking a
transmission apart I see how Tracy got most of his good ideas. I had a
friend do a lot of custom machining at his CnC shop. This is probably
not a solution for someone who would have to pay to have the work done.

It would be cheaper to by one of Tracy's units. The planet set, ring
gear and flange are now totally stock, and can be easily replaced. The
sun gear still need to be pressed onto the shaft and turned down. Things
are now held in place just like in the transmission. The only area that
I didn't find a good solution for, was having to press on and pin the
prop hub.

So the thrust bearing and the front oil seal are still going
to be a pain to replace. At least this time when I pin the hub I'll put
the pin all the way through, and not just part way from each side. Those
were a real pain to get out. Now I'm just waiting for some new seals and
I can put it back on the 20B.


I found a six planet set that has the same
12 lug mounting that I'll put in before I go flying, but I figured I
would run it with the 4 planet set since I have one, to see how things work.

Mark Kirkpatrick MSK6 20B

I like the Ross design. The only thing missing was the helical gear thrust bearing.
The hollow prop shaft made it the lightest of all the Ford C6 planetary
based PSRUs. Rotamax would do well to copy it. With the addition of a
late Ford six pinion planetary I see no reason why it cannot be used
with the three rotor 20B.

Check out these Teflon seals. Last jpg. Should last forever.


Paul Lamar ...No rotor no motor.

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