I had a discussion with a friend this afternoon about props and he was
trying to parse the difference between a 14 1/2 x 23 three blade and a
13 1/2 four blade for the same outboard. Apparently, he was told he
will get much better trim response on a 20 ft CC with a four blade,
but the size difference is to prevent the prop spinning on the hub.

As I'm not much of a prop guy, I really couldn't answer that question
although we batted around some ideas.

Anybody say which would be better for, say, a 225 Johnson?

Later,

Tom