Yes, I have met Mr. Mongo, although I do not know him well.

I am also very familiar with the O.S .46 AX as we use it locally in Minnesota for our quickie class. My favorite prop for that motor is the 10x7 apc Sport prop. A well broken in motor, will turn it roughly 14,300 - 14,500 rpm up here Peak. I back it off the standard 300-400 and race.

A couple other good props for that motor are the 9.5 x 8 N and the 9.5 x 8.25 N, these are not quite as quick on the first lap or the corners, but offer better top end speed.

I have not used this motor on the draggier plane you guys use, so I can't recommend the best prop. What I do know, is that you should select the prop that runs best for how you fly. Some people here like to bank and yank very sharp turns, others like to make a bigger oval course and fly smoother.

Are you using a bladder tank? If so, you shouldn't need to set it any more rich than 300-400 rpm.