[PUP] Over propping

[bob england]

I realize that we all drive cars, and overdrive is the greatest thing since 
sliced bread, but, it don't work with a boat. Nothing screams "I don't have 
a clue" more than overpropping a boat, especially on purpose. A diesel 
engine burns x amount of fuel to produce x amount of power, rpm's makes 
little difference except for a little more drag on the reciprocating parts 
in the engine. An overloaded engine on the otherhand, burns more fuel to do 
the same work at a lower rpm than one spinning faster but not overloaded, 
and the heavier loaded, lower rpm diesel engine will wear much faster. 
Overdrive does not work in boats.