"Michael D. Lilja" wrote:

Okay, so sounds like fuel consumption is acceptable and power is not a
problem.  What would be the difficulty, if any, to create a motor or prop to
spin in the opposite direction for counter-rotating purposes? Sounds like it
would be a great engine to use in a pusher configuration becuse of its
small, round size and the extension caused by the PSRU. Have a great weekend
and thanks for the help.

Paul Lamar responded:

Not possible to make it run backwards.

Michael,
Are you trying to create a co-axial counter-rotating pair of props for a
pusher?  If so, look at what the Leon brothers did for their "twin Cozy".
They mounted the engines opposite, and then used a pair of belt PSRUs to bring
the props together (co-axial).  By having the engines mounted opposite (i.e.
one forward facing and one aft facing), they are naturally counter-rotating.
See:
http://www.infortel.com/cozy/article_english.htm
The Leon brothers had problems with vibration-induced cracking, but that may
have been aggravated by the inline 4 cylinder 4 stroke engines they were
using.  I would expect a similar setup with Wankels to have less of an issue.
BTW, I'd mount the engines with the plugs to the inside and the exhaust to the
outside, and use oil pressure engaged/driven tensioners (for automatic
"feathe
ring").
Russell Kent

"Michael D. Lilja" wrote:

Russell,

Thanks for the response.  My thoughts are more conventional than that.  A twin engine pusher with
one engine on each side of the fuselage.

Mike

There is a canard flying in France with twin MidWest rotaries
in that configuration.

Paul Lamar
 
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