Amaster air screw working better than an APC to me thats like saying a MDS 48 is better than a Jett 46. the master airscrew props have less pitch than apc. take a 12x6 apc and 12x6 MS put props together and compair them. the MS has more tip area which keep the rpm close, but the apc delivers more thrust and has more pitch speed. The best hover props are the bolly sport line of props but they are harder and harder to get in the states.