Hi Bax. Well problem is solved, the 18x10 is turning 7800 rpm I don't know how much thrust the engine is developing yet, but by the way my plane is moving I can tell it's better than before. I found that some trash had gotten into the carb and was creating a small restriction that would starve the engine of fuel. Cleaned it out and now all I can say is wow what an engine. And it transitions perfectly at the factory settings. Thanks for all your help.