hi Ryan,

My mount is actually a soft mount: it works on the same principle of the Hyde one. A rubber tube that is allowed to withstand the primary forces that shake an engine (the ones that make the cylinder head go left-right, and that are the ones that make our airplanes shake and rattle and make damages to the radio).
The retaining axle is located on the crankshaft axe, so not to hurt the primary job done by the rubber.
His use comes to play whenever there are other forces acting on the engine: the engine is free to rotate (dampened by the rubber) but not to wobble erratically in any direction (just pure rotation along the thrust line)
In this manner, the rubber is allowed to work at his best (on pure torsion)
Since there are no pulsed forces acting along the nose-tail axe, the retaining pin doesn't contribute to propagate secondary vibrations to the airframes.
Hundreds of customers can witness this easily.
I have no one customer that I know to be replacing my mount with another one. Until now, of course..

Let's keep in touch

Roberto Bracchi - Modelcompositi