ORIGINAL: darkfa8
I haven't been over to that forum yet.. is it on here or another site?
It's here.
Also, something else I'd like to learn more about are different prop sizes and balde counts...
As others have already said, in general, 2 bladed props are most efficient. At scale meets you will often find models sitting on the ground with display props. These are nice to look at, but are replaced for flying. Based on your earlier post I would guess you are looking for prop info related to hot rodding. Hang out in the forum I pointed you to, and also in some of the racing forums (under Pylon Universe). There's lots of good stuff out there.