RE: Revolver + Saito 115
lol sorry but do not run the 12x10 or 12x12 prop you will be so slow he will have to throttle back hiss 55 to stay with you.
try a 14x8 apc on 30-35% and will be faster than him for sure. i have the 125 on mine and turn a apc 15x8 at 9700 and scoots along. i would like to run a 14x9 but havent found one yet. a 16x7 might be faster but havent flown it yet.
to go fast you need more thrust than drag. well the revolver is draggy so need lots of thrust. the 14x8 will be perfect for you. try to pro the 115 for about 10,300-10,500 on the ground with props less than 9" pitch
the 10 and up props are stalled on the ground and generaly have a higher rpm on the ground than in the air or stay the same. these props load up more in flight unless you get going over 130 or so.