BEAUTIFUL patriot!
Wow- that is ALOT of prop. I would try a 10x8 or 9x9--- With a tuned pipe it sounds like you are not gettin' "on the pipe" the 9x9 (APC btw-) should help...
Those air intakes just slow you down anyway and your fakes look really good-
Congrats on the maiden flights- keep us posted!
BTW- My name is James .G and I am 33--- [X(]