My RV-4 is around 39" too. I doubt CG will be a problem since the engine / redrive CG is probably near the same point as a Lycoming. Think of the drive as a long prop extension that has little effect on aircraft CG.
Tracy
On Sun, Jan 25, 2009 at 2:47 PM, kevin lane
<n3773@comcast.net> wrote:
after mounting my psru to my renesis engine and
onto my klepis mount I measure 39" from flange to firewall. my existing
-6A w/ O-320 measures approx. 33". in the back of my mind I remembered
4-5" difference, not 6". I assumed that all the
geometry had been calculated when I ordered the engine mount. I
currently have 5" between the water pump pulley and the firewall, which is
wonderful, but, I don't want my battery(s) in the tail either. am I going
to get into weight/balance issues? what dims do other RV's
have? kevin