X-Mozilla-Keys:                                                                                 
charles.harbert wrote:

Perry, I'll add just one last bit of comment on thrust loads for the  13B. I
know several people have lost their engine thrust bearings because of the small
constant gear thrust from the PSRU helical gears which would have produced
catastrophic results had they not been discovered. One ended up rebuilding the
entire engine and replaced the eshaft due to excessive wear on the thrust face.

The thrust loading for a direct coupling is many, many times this small PSRU
load. Essentially, you are pushing the entire plane thru a 1/4" wide Torrington
needle bearing (originally designed to only take intermittent throw out bearing
thrust loads). It can't take these higher loads for very long before failing
IMHO.

Bill Freeman came up with a good method to retrofit your combination which I
hope you will consider.

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