Date: Tue, 02 Feb 1999 01:34:25 -0800
From: Paul <rotaryeng@earthlink.net>
To: z <rotaryeng@earthlink.net>
Subject: Motor Mounts

Frank Davis wrote:

Paul,  As a relative new guy to your newsletter, I have found many
interesting topics under discussion.  One of these is the "Questair
Venture Type Motor Mount".  Intuitively it looks like a good , 

practical

design.  I may have started receiving the newsletter after the 

rationale

for it was presented.  Can you provide me with any references that
establish the basis for it becoming your de facto standard
design?        Cheers, Frank

There could be some out there in the engineering literture. I never
looked. I think it was designed by Jim Griswold designer of
the Questair, the Piper Malibu and probably others. It is related
in a way to modern rear engine race cars in that the nose gear loads
in the Questair are fed directly into the engine and not first into
the structure and then into the engine. This among other things 
makes the Questair one of the most efficient airplanes ever designed. 
Its excellent performance in racing bears this out.

That was what first got my attention. I then started to 
see other advantages of the design not the least of which was 
its low cost compared to a traditional dynafocal type mount. 

The third important part was the ease at which it adapted
to the rotary. The rotary of course was never designed to be installed
in an airplane so its motor mount hard points were on the wrong 
end of the engine. Putting a large two inch tube through the pan 
was a very simple and cheap way to add the required hard mounting 
points to the engine.

Paul Lamar
 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

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