The aluminum billet version was getting expensive. The material alone
was $66. I know I just bought some today. I had to pay $16 just to
have it cut to length.

Then I was having trouble finding suitable 10 mm 1 mm pitch metric
screws. I never found any I was completely satisfied with. Making our
own was getting expensive.

The welded version can use the stock 10 mm 1 mm pitch bolts as it is
only .125 thick which can replace the stock clamping plate

The light really went on when I thought of welding the walls directly
to the steel spline plate.

No bolts or screws needed to bolt the spline plate to the coupling.
The spline plate is half the coupling.

Nothing could be easier or simpler.

The walls are rectangular .75" by 1.5" 4130 tubing from Aircraft
Spruce. I have some in stock.


There must be only three walls because there are six 10 mm bolts.


Here is what it looks like. It fits the stock 2 rotor flex plate but
does not stress it. All torque is transmitted by the six 10 MM
bolts.


I will weld one up and send it to you for testing Mark.

Paul,

Remember, there's "the big nut" sticking out the back of the engine.  Are
you sure the hub, when reversed, will clear the big nut?

Mark

I will assemble it on my 3 rotor engine to check. We can always shave a few thou off the spline
plate here and there. There is more than enough length to transmit the torque.
I will also put the nut in the dwg.

Paul Lamar

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