For all you guys building composite airplanes this idea
might save you some time and simplfy the motor mount.
It needs a firewall that is 5/8 to 3/4 inch thick with a high
density foam or plywood core. The rubber mounts are installed
directly in the firewall making the tubing connection to
the engine much simpler. the ends of the tubes could be bolted
almost anywhere on the engine that was convenient. 

The washer on both sides of the rubber mount must be at least
1/4 inch thick and two inches in diameter  for a hard landing 
other wise the rubber will pull or push right through the firewall.

The loads on the mounts are higher so it will probably be
necessary to go up a size or two on the rubber mounts.

It does not seem to be practical for aluminum airplanes.

Please comment on this as it is just an idea in early stages
of development.

Paul Lamar
 
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