I made up a small steel flywheel to fit the counter-weight, but only big enough to bolt on a 5 1/2" Tilton dual disc clutch pack. I used a flex plate only to carry the starter ring. It did not occur to me to try to transmit torque through the flex plate. I had one of my drivers miss a shift and reved to the moon. The conical shape of the flex plate went dead flat. Bits of ring gear around the welds hug on and nearly cut the bell housing into two pieces. The remaining pieces were dribbled out onto the track for others to deal with. The flange the ring gear sat on was turned to 45 degrees. After that I TIGed the whole gear to the flex plate. They do fail in cars, that is why you can buy one with the cracks already installed. There used to be a doubler plate on top of the bolt circle to spread out the strain of the mounting bolts and reduce cracking. Are those still being used?

 

Probably not a problem for airplanes, but I would not transfer torque with one.

 

Lynn E. Hanover