I'm always buying and selling motors. What do you think about the supertiger .61 on a 40 size avistar. I run a tower 46 on it now. I see that the supertiger is about 6oz. heavier than the tower. I just like to see what different motors will do. I'm sure you are thinking, buy a 60 size plane if you want to use a 60 size motor. I guess I'm out for the thrill of trying new things.