Am using an older YS 120 with Master Airscrew 3-blade 14x7 and 14x9. Flies well with either, better pull with the 7, faster with the 9. The APC 15x8 is perfect, but looks unscale (except in the air). Performance is very acceptable with the MA 3-blade props. I don't feel it necessary to wring every last bit of power out of an engine/prop combo anyway, especially when I fly at part throttle most of the time to keep it as least a little realistic. I also used a very inexpensive pair of Hanger 9 retracts for their P-40 which cost about $25. Not the best, for sure, but I am a little rough on my "arrivals" now and then. These have longer gearlegs that look more scale-like. They do require a little surgery to install. The flaps on this airplane are very effective in slowing it down and the enlarged ailerons give it very sporty flight characteristics. I enjoy flying it and its very stable and forgiving for a warbird in my opinion.

Andy