The real science to prop selection is to first go with what is recommended (if of course you have experience and can just select a prop size out of the clear blue..) then fly the plane. If it performs as you expected, stick with it. If not, change it. Repeat until you are happy then fly it.

This does two things. First, it gets you to the right prop for your style of flying and where you are satisfied with the performance, and second, it gets you a small collection of props for the next plane.

See? Very scientific.

CGr.