It wouldn't do you much good unless you had either a variable pitch
prop or one that was mismatched to the engine and thus overloading it
most of the time. In the latter case, you would be steadily wrecking
your engine.

Unless the boat is light enough to keep going faster, putting more
power into the same prop beyond a certain point won't increase
performance. Sailboats don't fall into this category.

Many boats, especially sail boats, have props that are poorly matched
the engine and hull. If you don't think you have the performance that
you should for your horsepower, you might look into this.

--

Roger Long



wrote in message
ups.com...
A while back, I asked if anyone knew of a way to temporarily boost
the
power output of a small diesel and essentially the answer was
negative.
What i wanted was something like NoX used for gas engines. I did
talk
to my brother-in law who teaches diesel mechanics and design and he
immediately said "Sure, you use propane injection". It seems that
this
is used in heavily modified high power diesels used in diesel
dragsters
and diesel monster trucks. He estimated perhaps a 30% increase in
power just by bleeding a small amount of propane from something like
a
Coleman cylinder directly into the air intake. Of course, I
explained
that propane is heavier than air.......