Regarding the single. Check out page 2 in the forum, Product Announcements and Manufacturer News. It is a 40cc engine from Melody RC Models. I contacted Tommy about this engine in April and was interested in the motor. He seemed like a nice guy and was even going to give me a real good deal on one. Not knowing anything about the engine I was afraid to take a chance with it on my new airplane. It still looks interesting though. Maybe he'll send me one to test out.