Hi Paul, we meet briefly a couple years ago at OSH.  I have about 250 hr. of
flying on my project and a new web page at www.netlynx.us/sahobby  I broke
my Ross redrive a year ago and I'm looking for some inspiration to get back
to it. Thanks Mark Kirkpatrick

What part broke?

Paul Lamar ...No rotor no motor.

   I would use it for a boat anchor and go buy one of Tracy's.
   Ken

I love those nice Ross castings. The Ross is the lightest
box around. I would dial indicate the ring gear for run out
and if that was OK I would fix it. It has too many bearings.
All you need is the self centering sun gear and the e-shaft
pilot. Planetary are intrinsically self centering on the ring
gear and that is how the loads on the gears [teeth] are equalized,

If you are throwing it away I'll pay shipping.

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A 20B in and of it self, I maintain, does not have enough
torque to break a Ford four pinion planetary gear set.
The 20B torque is 240 ft pounds max. To prove it set the planetary
up on a bench. Lock the ring gear in place. restrain
the planet carrier from rotating. Allow it to float.
I am willing to bet $100 it won't fail with 1000 foot
pounds of pure torque applied to the floating sun gear.

These planet sets are used with V8 engines that have 400 foot
pounds of torque behind followed by a torque converter that is
putting out about 600 foot pounds or more.

Notice the discoloration the bearing forward of the sun gear.
Perhaps this was putting enough heat into the sun gear to
weaken it. That is one scenario. That is in addition concentricity
problems.  Another is the clutch disk used by Ross could be a factor.
Tracy uses a rubber coupling. Vance used to tell me he knew  of an
English engineer that was fond of saying: "An ounce of rubber is
worth a pound of engineering" :)

Paul Lamar ...No rotor no motor.

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