Well, Out of all of the research I have found the GT-80 is the best. I might just be 14 but I know R/C really well. If you get the right prop and stuff a GT-80 will work really well. And another thing ZDZ 80 vibrates more than the GT-80 and I hate those type of engines. A couple of people at our field has a ZDZ on there plane and everything vibrated out. I would get a ZDZ 80 but one thing. My mom and dad gave it to me for christmas. If they cost about the same then maybe I can get a trade in. But a GT-80 is a excellant motor for the plane.