RE: Patriot XL modifications
Very nice job, that is a great design, i wanted to do mine like that but i am not too good with covering jobs, your plane looks great.
I broke my OS 91 fx in on a 14x6 apc.,------ but with a tuned pipe i'm not too sure about, if i had to guess , i would guess mabey use a 12x6 or 11x6 i could be wrong....... I don't think tuned pipes do much good for the OS 91, mabey a few hundred rpm's.