Paul,
I'm just mapping out my PSRU design and looking at thrust bearings.
I know your in favour of needle thrust bearing, stacked.

I think I remember that Tracy has problems with some bearings and was
looking at my bearing book, but can't remember which problems with what
bearing he had.

I looked at the RPM limits on needle and ball  thrust bearings, the
needles are 2,400 and the ball are 5,000. Three needle thrust bearings
make up the same thickness as one ball thrust bearing.

Isn't 5,000 rpm sufficient because the input and output are going in the
same direction?
George ( down under)


No. The input is going at engine speed.

Paul Lamar