I'm putting two OS FX .91's in mine.
They have been excellent on the P-38 and MAS 3-blade 14X7.
I've used this match on 4 planes (single and twins) with excellent results.
The MAS are not as efficient as the APC'S (in my experience).
I've found that I can go up a size or two for 2-blade props on the APC's over the MAS and the engine can still handle it.
Also, on my WM F-82 using OS FX .46's, it works well with MAS 2-blade 10X8's or APC's 4-blade 10X6
With this logic, I've been considering the APC's 4-blade 13.8X10's.
Any comments or experience.
Thanks,
Sam

ps: Fedex says my P-61 is about 60 miles north of me.
With the 12-20" snowfall, now it should be next week instead of the original delivery
date of today.