use the saito 72......i am done with it.......it wasnt hard to do.....first i finished the wing then i took some hard wood and put it between two ribs and epoxed it in after takeing the servo and making sure it fit......then i took some 1/8" balsa and put it over the hard wood......then cut holes in it for the servo......then i just bolted it in......it flys great only thing is i got my aliron throws as far as they go and it still dips alittle at 3/4 throttle.