I have two Brison 2.4's. The older one likes a Mejzlik 20X10, the newer one likes the Mejzlik 21X8 best. Master Airscrews are good for stirring paint but not much else that I have found. I goup them and the Zinger Scimitars in the same group. do a lot of spinning but not much good for flying. My Brison 3.2 seems to like the Mejzlik 22X10 best so far but it is still breaking in.