I have never seen Champy. I do believe there is something to it. If you have the chance look up the documentary of Americas Lockness Monster done by I believe the Discovery Channel. This was done back in 2003 I believe. They had taken a research vessel the length of the lake and did not see...
As to problems I understand could be stringer problems under the engines and soft spots at the bow. Is this one of the problematic balsa wood cores? Any other problem s on the 300's? An ideas on fuel consumption and how low an RPM range to stay on plane? Any advise would be greatly appreciated.