dbow ,, any good 40 size trainer is good and the 46 fa is a good motor since we have 10 of them in trainer to war birds, side mounted to inverted and we use the master 11-7 as the main prop for that motor. we used a 10-6 with our oldest and after 5 years it needs brgs. but its still running. we have a easy fly 2 and a arostar 40 and a Goldberg cub, 2 at6 a tiger 2, pt2o Ryon so you can see they do run great and after the needles are set leave them alone.