Tell the folks who own the barnstormer that an OS70 works great. Makes for plenty of power, great sound, and a fast plane. I have alot of people tell me it's the best Aircore flying plane they have ever seen. You have to modify the front of the wood tray alittle by cutting away some of the wood tray. Most people will see how to modify it once the engine is in hand. Any brand four stroke would probably work fine. I'm just partial tohaving a good engine in such a heavy plane. I've even put a wing walkeron the top wing too.
William Holloway