I have a Kitfox 4 1200 with the 912 UL as well. I started off with a three blade IVO ultralight prop, switched to a 2 blade Warp drive 72" square tip prop, and then to a two blade 70" NR prop from Ukraine. The IVO was smoother and much easier to adjust, but did not have quite as good of performance as the Warp drive or the NR. The NR is just a little bit better performance than the Warp drive. Despite the war, NR is still shipping props, and the price is probably a bit less than a new US built prop. My new Kitfox 4 build with the ULS will have a 2 blade NR as well. JImChuk