World Models T-34 Racing?
Maverick,
My recommendation would be to prop with APC Narrow pylon prop 9x7.5 or 9.5x7 (depending on weight of your plane). This should be just right for the OS .46 and give you plenty of speed for what it is, with draggy airplane. Also, make sure the engine turn in the high 14,000 to low 15,000 RPM range (more would be better) to get the maximum performance. Hope this help.
Happy flying!
Sam S.