Well the problem is solved. I made seven consecutive takeoffs and landings that were normal and straight down the runway. The first few takeoffs I held in just enough right aileron to take out the left trim I had in the bottom wing. After that I cut-up a pop can and made a trim tab that I taped to the top wing. A few more flights and the old bipe was flying straight and level and now has ground handling characteristics like my other tail draggers. Boy, am I happy!

I think what was happening is that the lower right wing was producing a strong ground effect lift and the plane wanted to roll left. But since the wheels were still on the ground it could not roll and the plane would turn hard left instead.

It seems logical that ground effect lift increases as wings get closer to the ground. On by bipe the lower wing sits 4 inches off the ground and the upper wing sits 12 inches off the ground. The wingspan is 4 feet so the height of ground effect field on my particular plane is 2 feet. With the plane sitting on the ground the upper wing is in the middle (50%) of the ground effect field and the lower wing is in the 84% ground effect field. This assumes 100% ground effect at zero (0) inches and 0% ground effect at 24 inches.

It will be interesting if anyone else out there can verify this by getting his or her ground handling monster bipe to behave on the ground. Obviously those that have bipes with perfectly straight top and bottom wing are wondering what all this bumbo-jumbo is about. But if your bipe is nutty on the ground you more than likely have one or both wings with a warp. To improve ground handling set the bottom wing ailerons as equal as possible so that the left and right wings produce about the same lift during takeoff. Then trim the upper wing for in flight straight and level.

I learnt a lot trying to solve this problem. And thanks for the good input from all of you who took the time to jump in.

Oldbob