12  c

   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

    ----

   I want one too!!  I already have a cut down spline plate from Paul.

   Scott Gettings


   OK Jean here are a couple of customers in Florida.

   The cost would be lower if Jean sold a kit.
   No nuts and bolts.
   Some drilling and taping on your part.

   Extract the Ford plate from Tracy's coupling and send it to him
   for machining.

   Paul Lamar

   I'm in the market for a different coupling too at some stage before the first flight.

   Alex Molteno



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