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I built my RV-4 mount with no offset. I actually built inserts for the eshaft bearings with a hole in the middle so I could 'sight' thru the engine (no eshaft in the engine mockup) to the thrust line (an 'X' on the mockup firewall). I built it with no offset because at that time I didn't know whether Tracy was going to build the 2.85 drive and I absolutely would not fly with a Ross (Bill Freeman said the Ross was dangerous-good enough for me; too bad Paul L. ran him off and he didn't choose to participate here!). Thanks for the info that Tracy's mount is also built with zero offset - I'm in good company. I had planned on vertical stabilizer offset based on the redrive I ended up with - I hope someone knows the aero of motormount offset vs. vertical stab offset. I would shim the motormount a small amount in order to reduce the vertical stab offset if the aero would benefit. My RV-4 plans build .25" offset in the conical mount.
Ken Powell
Ken-Powell-mm-Jan27_12.jpg
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