Thanks again for all the input. Sounds like a 2 stroke is definitely OK to use for a while. Wouldn't be competing this year (probably) and only doing Sportsmans next year, so two stroke sound shouldn't be a problem.

I think I'll fly the wings off my Dolphin while I save up a few bucks and get a smaller pattern plane and transfer stuff from the Dolphin to the pattern plane while I fly my Decathlon. When I get enough $$$ for the biggest four stroke that will fit (hopefully to use in a later .60-.90 size), I'll put the AX back in the Dolphin. Sounds like I got a plan