Extended point set screw way of coupling the sun gear to the silicon rubber coupling.
This is retrofit able to most of Tracy's gear boxes.
It is much stronger and eliminates most of the back lash.
No spline. The input shaft is increased in diameter from one inch
to an inch and a half.

Ten 5/16th set screws are shown but I think we could go up to 3/8th set screws
which are much stronger.

The silicon rubber coupling will be used in the time to climb engine but
that is a stright cut sun gear without the axial helical gear thrust.
Some what simpler to implement.

The PSRU adapter combination motor mount will have to be re-bored
for a larger oil seal. The helical gear thrust will be reacted by this plate
instead of the thrust bearing in the engine which is not up to the job.
This was discovered about ten years ago.

There is room between the sun gear and the PSRU plate for a torque sensor
hydraulic cylinder such as done in the PT6 gear box. Torque is directly
related to helical gear thrust.

Paul Lamar

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