What are the features desirable for the best PSRU for the Mazda Rotary engine ?

Steve Carlisle

An exact copy of the Ross :) With one or two small improvement.
I would use extended point set screws for the prop flange.
Better than those two 3/8th inch pins. 3/8th holes all the way through
the 4130 tubing prop shaft weaken it unnecessarily. You can tell that
by just looking at it. In addition to being much stronger it will be easier
to take apart and service. Much much cheaper than hogging it out
of a solid piece of chrome molly.

Hundreds of Ross's have been sold with thousands of flight hours and the only design
issue was the lack of a helical sun gear thrust bearing.  Long since fixed.

The needle bearings need no high pressure oil from the Mazda oil pump.
Just a dribble.

It will be hard to beat the weight of 35 pounds. The weight of the PSRU is
critical in a tractor engine AC as it strongly affects the CG.

Old Lou Ross got it right from the start.

Paul Lamar

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