In normal flight there is no load
on the prop bearings when the prop shaft is driven by a planetary
gear set.

Paul, Where does the prop thrust go? Not being a smartass here I just wanted to be sure I followed
where you were going. I realize needles are lighter but they do need a better shaft surface. I
like the fact that the tapered rollers don't rely on the shaft surface as much and are easy to
replace when worn. I really like the large diameter hollow shaft though. Much lighter and stiffer
to boot. Bill Jepson

Into the separate thrust needle bearing.  Same as the Ross.
 
We harden the hollow shaft and grind it like any other bearing surface. 
The spec is Rockwell C 58. Saves weight over a separate bearing race.

Paul Lamar
 
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