RE: cmp p47 thunderbolt
Jeff
I've seen this problem with the CMP P-47 before. The plane wont fly straight without constant elevator control no matter how you trim it or how much nose weight you add. A friend of mine lost one after a few painful flights. Another one finished his but wont test fly it until we fully understand the problem. So far the only thing I came out with (other than the CG issue) is that the wing incidence is 3% off the thrust line .
So far as far as I know the only one who has had success with this plane is Hellcat so I guess he's the one with the right answers.