If your going to buy a new 30 size motor I would go with the TT39 not the 36(I don't think they make the 36 anymore anyway). The 39 will have all the power you will need for a 30 size heli( from what I heard and read). I have a OS 32 and I know what you mine, it dozen't have the power I would like it to have(but it works good). Have you tryed 30% fuel? I don't use it becouse it cost to much, but I would like to. I have read that it helps the 32 alot (more power).