I have her mounted on a H9 P-47 and I've run only about 3/4 gallon through her so far. I'm running a 13x6 MA prop with 15% nitro/18%castor-synth blend. It has a slimline pitts muffler with one exhaust pipe crimped shut. I have the low end idling between 2500 and 2700. At full throttle I am getting around 11150 to 11200 rpm. I live in Central Florida so we're pretty close to sea level and the atmosphere here is HOT and STICKY.

I also ran a 14x6 MA prop, but I cut the nitro to 10%, and am getting around 10500 . I've been thinking about going to a 15x6, do you think that would be too much prop? I'm interested in more vertical pull than top speed.

Dave