Well I have been spending a lot of time flying the Bipe, and trying to prove my theory about ground effect. No such luck. I can get the plane into the air on every tack off but the right aileron trim has little to do with it. If ground effect was in fact the cause, than I should be able to lower the left aileron and raise the right and have the bipe turn right at the critical speed. The plane would take off and then roll right, but never did it turn right on the ground. Having proved to myself that I was wrong makes me feel accomplished and bad at the same time. I post this so that others don’t spend time with this flawed idea.

Here is what I think was happening all along. Coupled with a few minor things like GC aft 3/16 too far, tail wheel not perfectly aligned with the rudder, and P-factor, combined to make the bipe crazy on the ground. Added 1.5 oz. to the nose, straighten the tail wheel to be in alignment with the rudder (only about 1/64 off) and during take-off hold full down elevator until the tail comes up. With the tail up P-factor is eliminated and the bipe tracts straight down the runway.

Enough said, I’m out of here.

Oldbob