RE: new YS 45 with tuned pipe
I have been running YS 45 for 5 years , on airplanes like ultra sport and patriot , my better results with this kind of airplane have been with 10x7 and 10x8 APC ( 10x8 strictly shaved and 20% nitro ) with tuned pipe 7.5 c.c. , I can't remember if the length of the header is 5" or 5 1/2 " , RPM around 15,500 and plug O.S. R5 . But this is just my case .