>
    >> Let me know if you need more dimensions Jerry.
    >> --
    >> Paul Lamar ...No rotor no motor.
    >
    > Hi Paul,
    > wasn't moving the prop out to 44 inches the way to go?
    >
    > Kind regards
    > Thomas
    >
    > I am not sure. Depends on the weight and balance. Some guys are
    > beefing
    > up the tail so that adds weight back there. Beefing the tail on the
    > rotary powered RV4 is unnecessary. Tracy has not had the tail skin
    > cracking problems
    > the Lycoming powered airplanes have experienced due to way less
    > vibration.
    >
    > --
    > Paul Lamar ...No rotor no motor.

   Thomas, most plans, using an 0-320, have the prop flange  at around
   38 inches.  I recommend standardizing the distance to 40 inches for
   most   rotary installations.  Doing so provides some very useful
   space between the engine and firewall.   Note that a p ported engine
   will probably weigh less than an 0320 FWF.  The absolute minimum is
   36.75 inches if  you want to be able to RR the water pump without
   pulling the engine.   If for c.g. reason the prop flange distance
   needs to be some amount greater than 40 inches, we can do that.  So
   far only one engine installation has required more than 40 inches.
   There are no  serious c.g. issues swapping in the rotary but you will
   probably have to fine tune with battery placement.    Jerry

What do most of the RV's use for the 320 firewall to prop flange?

Ken

39 inches as I recall. The RV10 is probably an exception as
it is designed for a six.