Originally Posted by firstname.lastname@example.org
The second friend has a Moody 42 with the same engine as me, Yanmar 4jh2te. He put on the biggest fixed 3 blade prop he could. ...
Selecting the biggest prop is insensible and a probable source of engine problems. The prop needs to be sized to the engine and boat, both in terms of size and pitch.
IMHO, going with a fixed prop on a sailboat which for most of us (except the multihullers like SD) means we have an already relatively slow boat, only makesd sense if you expect to be powering most of the time. With some sailboats, that is a reasonable assuption to make.