Paul,
     Jerry Bass has made further refinments to his thrust
brg "cap" after running it. Perhaps he will give us 2.85
Ross owners an update on any changes and any operational
info he has found.

    Kelly Troyer

Ian & Irene Beadle wrote:

  Kelly
I have a 2.85 drive with the Jerry Bass modification. In my case the 'top
hat' bearing holder is simply a flat disc of chrome moly  with a hole in it.
I added an extra oil feed to the top of the outer gear at an existing hole
in the gear. There are two oil returns to the sump. The oil returns have a
powerful magnet around them. 30 hours so far, no problems. Gear lash at end
of prop. 3mm and holding. PTFE additive in Mobil 1 oil.
Ian RV6A.

Neat thing about the Ross 2.85:1 is the prop rotates in the same direction
so the prop is connected to the planet carrier and  the helical sun gear 
needle thrust bearing only sees the difference in engine speed to prop speed or
only about 3000 RPM.

In the Ross 2.17 to one box this is not the case. The planet carrier is fixed
and the helical sun gear thrust bearing sees the full speed of the engine
or about 6000 RPM. That is why you need two needle thrust bearings
back to back with the Ross 2.17:1 box instead of only one.

Paul Lamar 

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