Mine was on a Top Cap. Gave me nothing but headaches. shook the poor plane to peices, dead sticked a lot. Couldn't get it to idle less than 3000 RPM (must be that "low end torque" everybody talks about )

Recently switched it out for an Irvine 53. Ahhh so much better.. never dead sticks, low vibration, it idles, pulls out of a hover every bit as good as the saito 72 did, all for half the price.

there is no question that the saito 72 weighs the same and kicks a 46 2S around, but the same can be said for OS 50SX, Irvine 53, Webra 50....