Hello All,



Here’s a question about the ROSS PSRU, I’ve gotten many good suggestions
on modifying and adding thrust bearings to prevent the input shaft from
rocking back and forth.  There’s one thing that keeps nagging at my
mind; I remember reading somewhere a fellow had a ROSS PSRU (no mods) on
a gyro and he was able to put over a thousand hours on his unit without
any troubles.  Now a gyro is a pusher, and my plane is a pusher (Osprey
2) – would I have the same luck on my ROSS PSRU?  Or should I bite the
bullet and do the modifications to my gear box?



Cheers,



Burck

Good question. I assume you have a 2.17:1. The planet carrier is fixed
to the housing so the prop shaft is pushing on the planet carrier and not
the sun gear. The sun gear tends to un screw it self and that is why
it puts a load on the e-shaft and then on the e-shaft thrust bearing at
the front of the engine. I have no idea how the guy lucked out
with a thousand hours. Perhaps he did not have as much HP as Tracy had.

IMHO you still need that thrust bearing.