HP loss from engine to prop?
Did a search. Couldn't find what I was looking for. So...
Does anyone know the approximate percentage loss that you might usually see between the engine and the prop at displacement speeds for, let's say, a 30k lbs. trawler? That is, if I want, for example, 50 hp at the prop, how many hp is the engine going to have to be producing?
I realize this will vary with hull shape, LWL, etc. Just looking for a rough rule of thumb, if there is one.