I am working with the four star 40, with 4 inches taken off each wing, enlarged control surfaces, and now a couple of tail repairs that ended up adding weight. This makes it not float, which in my opinion is a good thing.

As for the engine vibration, I have another thread that talks about it here http://www.rcuniverse.com/forum/Vibr...2119719/tm.htm . I doubt it is covering vibrating as I can see the muffler vibrating when it is at the throttle setting that vibrates it.

As for my observations, remember we are talking about the 4*40, and as you can see in this thread, Bruce Tharpe, the designer of the 4*40 confirmed the issues I spoke about before I made any changes.