Paul,  are you able to locate the cg of the engine w/ Tracy's
drive?   I would like to be able to calculate the effect on c.g.
when moving the engine away from the firewall various distances.  So
far I have operated with the  assumption that if the prop flange
distance called out for an 0-320 is maintained, the rotary will not
cause c.g. problems. Experience bears this out.  The other assumption
is that the rotary and the 0-320 weigh the same.   This is probably
not true.  I suspect the rotary is actually lighter. Certainly when
the rotary is replacing an 0-360, it is much lighter but we still try
to use the prop flange location. There are advantages (space,
streamlining)  to extending the engine out away from the firewall.
I don't know if RV's with 0-360s and constant speed props use the
same engine mounts as 0-320 wood prop RV, but I suspect they do.  The
p port rotary is so much lighter than the Lyc/Cont of equivalent
power- we should be able to do  better than just matching prop flange
location.   Jerry

It depends on the prop used. It is right around the rear end
housing (car) + or - 3".

True on the P-port engine. With up to 250 HP it replaces
most six cylinder NA air cooled aircraft engines while
weighing about 100 pounds less.

The CG of the aircraft engine is a bit further aft
because there is usually no PSRU let alone a 45 pound PSRU.
A carefully designed Ford C6 based PSRU could be up to
ten pounds lighter.

Paul Lamar ...No rotor no motor.

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