Dutchalltheway, that is a mouthfull, this is my first Twist, I usually stick to IMAAC type a/c, this is my first 3d machine and am having a blast with it. If I had to it over, with what I know, I would have gone with the OS1.20, but the 1.60 was in hand. The motor install with the 1.20 is very simple, with the OS 1.60 the mounts had to be modified, very little room with the 1.60, where as the 1.20 will just drop in. I do not do 4-strokes so I can't help you there, hanger 9 recommends there line of Saitos. The wing is very thick so it flys nice and slow, harrier landings are easy. I do not fly 3d ,but this A/C makes me look like a champ, with your twist 40 time you should be able to put on a show.