"Gary Warner" wrote in message
...

We have an inboard and, of course, the prop shaft exits the hull at an
angle. I just drove by a similar (but different brand) of boat and it
appears it's prop shaft comes out at less of an angle. My first though it
that a angle that gives a more push forward and less push "up" would be
more
efficient. Is that about right??



Yes but the real gain in effiency comes from the fact that the pitch on
the blade on one side now more closely equals the pitch on the opposite
side. This also means it takes less rudder to maintain a straight line and
therefore less drag.
Gordon