low drag.... cut servo sized slots in your ribs and install the servos there horns pointing outwards, gets them out of air flow.
i've got a GRRT here, hoping to use a fan, 26K RPMs on this engine should be enough
we did have a 8x10 on it, damn fast, but not the RPM it should do. we just didnt know back then
theres no such thing as wasted RPM. infact, a dickie bird told me dont go over 7-7.5" in pitch, its slower, go with the extra RPM you get past that figure, and that dosnt mean running a 11x7 on it.
8x8's seam good