Thank you for the information and advice gentlemen. After reading your posts and some other research I've done, I've decided to stay with nitro engines until I get more experience and work with my club's members who fly the 4 strokes. I don't think I'm ready to move this fast with what little I know. I built a second plane this winter, a Sig Somethin Extra, and put an OS Max 46 on it. Hope to fly it later this summer. I just bought a Mustang P-51 kit and thought about the 4 stroke motor for it, but have changed my mind, goinggto try to find a good, used OS Max 61 to 91 for it. Thanks again you guys. This forum is a great place for good info and advice.
Jim