Ken, I don't have the chafing problem with the lower wing that you do. Probably is because I am using the US .41 which does not produce as much tork as the G-62 or as much vibration. I think you have hit the proverbial "nail-on-the-head" with your fix for the down trim problem. Great thinking! I was almost sure that this had to be a wing incidence problem, but since this is my first biplane I was not sure how to fix it. The interaction between the two main wings is still somewhat of a mystery to me. I will try your remedy though. Thanks very much for your help!

Sam