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Scott,
I’m certainly not an expert with regard to the pitch question, but from my experience it seems like 10" pitch is a little shallow for 1 person (lightly loaded) in an Alumacraft FD with a 30hp motor. When I run my Merc 25XD on my 14 foot Sea Nymph I get about 25mph. I’m running an 11" pitch on that motor and it could use more pitch for more speed. I believe it would benefit from a 13 pitch prop. I haven’t measured the rpm with a tach but it winds up. I likely won’t mess with it since I rarely run that motor with no one else in the boat. (I like a Fastwin on this boat with just myself in it) It will push a full load along at a nice clip. That boat is a bit of a handful in rough water running flat out with the Merc 25 on the back. It is pretty comfortable cruising at 20mph at a little over half throttle though. I have a video on my YouTube channel of me running the 25XD on the Sea Nymph. I hit 25mph flat out in that video. She’s screaming along at WOT. Here is the link if you want to see it.
It makes some difference if you are tiller steering or forward steering too. Sorry for the lengthy post. I hope this helps some.
-Ben
OldJohnnyRude on YouTube