Subject: 4 copies of coupling IGES
From: paul lamar
Date: 6/17/2017, 1:30 PM
To: A10-Me-Earthlink


  Did everybody get 4 copies of the coupling IGES drawing? If so I am
  sorry but it was not me.

  That may have been done by Earthlink They are having a bit of trouble
  with their email.

  Kevin did you get it?

  Paul Lamar

  Hi Paul, I got the coupling IGES Dave Macandless  in Perth

  Just one copy Dave? Earthlink sent me four.

  Paul Lamar

  I have a copy. I need to print this stuff out and take it to Shaun,
  the company is called Tangent in Smyrna TN. I will let you know next
  week.

  Kevin Alderman

  Are you in Tennessee know Kevin?


  Here are some pictures of the welded steel version.

  It needs to be improved.

  Paul Lamar

  The auto flex plate with the pressed and tack welded ring gear has
  been known to fly apart if the assembly starts to resonate, the flex
  plate had the torque converter bolted to the periphery of the
  flywheel this helped to negate the problem of resonance, the pressed
  plate is only 2mm thick, very light but has caused serious damage to
  an aircraft here in NZ.

Andrew Campbell

Yes I know about that.
That prompted us to design this coupling.

This design does not relay on the flex plate.
The flex plate's  only function is to start the engine.
With this design the coupling is bolted directly to the rear counter weight
with six 10 mm socket head screws. Very solid and a direct connection to
the e-shaft.

Tracy bolted his to the flex plate and that failed the flex plate in
several airplanes.
Here is the result.

Paul Lamar.

Good morning Paul

To solve the flywheel came apart i did machine a 4130 .062" thick and botlted to the center hub and  outher holes ,i include photos to show what i did

JEAN PRUDHOMME


That is cool Jean to have an alternator built in. Beefing up the flex plate ring
gear however is the wrong thing to do. What you have is an 8000 RPM gyroscope.

Every time you turn or stall the airplane tremendous precession loads are applied
to the e-shaft. Best to build a rubber coupling no more that six inches in diameter.

When Dave Leonard raced at Reno he destroyed the flex plate Tracy had
bolted his coupler to. At Reno one is in a continuous turn. It only took a couple
of days to turn the flex plate into scrap. Keep the weight down near the rim
as low as possible. Don't add any material beyond 6 inches in diameter.

Paul Lamar

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