I'm new to this R/C fun and love it. i purchased a almost built old 172 at a garage sale. .25 size, finished and tried it out. on take off the plane rolled to the right and smacked the ground. fixed it. to make things short it did this everytime, untill the last fix, i mounted the engine straight up with no angle to the right. it only had about 2 degrees to begin with. but with the engine straight, it took off straight. whats up with that. everything i have read says you have to have some angle for for torch. any thoughts. rick near elderton