The real problem with propping is that there's so much more to a prop than just the pitch, and all of them effect how the engine preforms. You have pitch, diameter, rake, cupping, prop material, type of blade, blade tip, number of blades, and of course, position of the blade in the water, just to name a few. (there are more) And each and every one of those items can and will effect the overall performance of the engine and the boat.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God)
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.