Per the original question, I have the Saito 180, and I run the apc 17-6 with Omega 25% nitro with 4 ounces of Klotz synthetic per gallon, and my tach reading is a whopping 9,890rpm. I was shocked with that number, and it's on a H9 cap, probably in the high 12 to 13lb range, and I can take off in about 25ft, pull to a vertical line, and it will truly pull out of sight. All the power you'll ever need and then some. The beauty is, as somebody else mentioned, all that torque. The downline breaking on this prop with the 180 makes the back side of cuban 8s and other such maneuvers a thing of beauty. Makes it much easier to fly a precision sequence. With the 25%, the transition is more then acceptable for any 3d including the fine transition needed for harrier landings. Fuel it up, set it, and forget it. My only complaint, it likes to gulp fuel.