In attempt to figure out the plane’s left roll tendency, I picked up a digital level at Harbor Freight this morning, leveled the plane and started comparing angles between the wings. No matter where I measured, they were very close, within 0.3deg. I put the level parallel to the longitudinal axis of the plane and put it on the wing close to the cowl, on the inboard side of the aileron and on the outboard side of the aileron – all angles very close on both sides.
The only thing I did notice was that the left aileron was mounted ~1/16 lower than the right one, so that when you ran you fingers on the underside of the wing over the aileron, you could feel a bump transition to the aileron on the left side, where it was level on the right side. So, I shimmed the right side aileron down with washers to make the the same. It was a great day for test flying today – calm and not too hot. Unfortunately, it flew exactly the same – wanted to roll to the left.
I also noticed (I’ve been seeing this in other flights, too) that I have a hot #3 cylinder. When I push it, it jumps up to 435F. When I got back to the hangar, I looked at the cooling plenum – I now realize that it was not optimal for getting air to #3. I modified the main plenum this afternoon, and need to also modify the runner – I’ll do that this week. I’ll be down for a few days while I take care of this. Lots of time to think about my left pulling tendency.