RE: Pipe Setup Question
Its been a while, but I think I finally finished my project. I ended up using a 13cc marine pipe and changed the piston modifications slightly. With a OS91 heli carb I was able to obtain a stable 15700 RPM with an APC 10X10 prop on 10% nitro on the test stand. I am going to re-test this motor with my modified ST2300 carb, but at the current rate of progess this could be years away.
The most interesting part is I tried an APC 11X12 prop (suggestion from another RCU contributer) and got 13700 RPM. I space the pipe back 3/8" and got a more stable 13500". This gives a prop speed of 153 MPH compared to 148.7 with the 10X10 prop at 15700 RPM and is displacing about 25% more volume than the 10X10 prop.
Now I have to get around to putting it on an airplane