Whats the deal on APC props? Do they only work well on 4 cycle engines? I am running a MAS 11-7 on my FX46 which is on the front of my Midwest Zero. Flys fairly fast if you want or will hover at a few clicks above idle. I thought I would try some APC porps for better performance if thats possible. I was getting 14.5 K rpms with the MAS prop. I tried a 11-7 APC and the engine would only rev up to about 10K and was hard to adjust. I thought this too slow for a takeoff so I tried a 10-7 APC prop. Now I was in the 12K range which was fast enough to fly. I adjusted the engine and took off. The plane flew ok but not as fast as with my MAS 11-7. When I throttled down below 1/2 throttle the plane started to lose altitude very quickly. There was not going to be any hovering with this prop! I didn't realize that I would lose so much rpms with the APC prop. Is there an APC prop that does work well with the 46 size engines or do I just go back to my the MAS props?? I was going to try one on my FX61 engine but I am reluctant to risk my warbird based on my efforts so far.