12
I am making a new coupling for my RV4.

This is using Tracy one inch input shaft and the Ford powdered metal
female spline plate.

It took more time getting the rivets out than machining down
the plate for a 1.5 inch pilot in the blue rubber bushing drum :-)

There is some unnecessary hub material beyond the end of the spline
which I removed to save a bit of weight.

It is far easier to balance this than Tracy configuration as all the mass is
on a smaller radius.

It greatly decreases the polar moment of inertia and the
stress on the flex plate. A few laps at Reno destroyed Dave Leonard's
flex plate.

Jean is working on a similar design. He could make them for you
if he wanted  to :-) I am getting too old to work :-)

Paul Lamar

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