It is 160 degrees. I don't think the pipe made any difference in rpm. It wasn't on the pipe I didn't think. It was a few years ago. My K&B RR .29 revved about the same with no pipe. 20,000 and a 10" pitch works out on paper to about 200 mph (if it is 100% efficient, doesn't unload in the air, plane has no drag, prop blades are wide enough...) The Nelson .36 would surely beat that. I think the 40 Nelson pylon planes go about 200. edit, I also had to drill and tap the crankshaft on the Axial for a 10:32 stud, I made probably over 50 spinner nuts for most of my motors. I hate spinners at the field, but like to use starters
Last edited by aspeed; 11-18-2013 at 06:14 AM.