Hello the engine runs great in the air but after a loop it does cut out for a second then runs good it has never dead sticked on its own I will try the warm up thing and give it a try. And as far as the OS 61 powering the four-star 60 it has more then enough power not a fast plane but lots of power for a newbie like my self rolls and loops great and can climb great im running a 11x7 prop but going to try an 12x6 next time I go out