For me, the 12x6sf is THE prop for this plane. I think that's because I like to hover and I need a little help from the plane. I've flown it with just about every prop between 10x4.7sf to 12x6e. A lot of guys use the 11x5.5e. But I have just gotten used to this plane as a slow floater, not a streaking pattern ship. Prop choice will allow you to do either to some degree. Pretty versitile ship. Now that I have adapted to throttle-on landings it feels wierd with an e prop that allows the plane to glide fast. But different strokes for different folks. Good luck with yours. -Fred