wrote in message
...
On Sun, 11 Apr 2010 12:01:26 -0700, "nom=de=plume"
wrote:

No I am saying that is a big drag and it will be more than noticed. It
will seriously affect fuel mileage and performance. There is a very
good reason why props are the way they are, particularly the trailing
edge of the blade, where this swimmer hit. Even a very blunt work boat
prop has a sharp trailing edge. Otherwise it cavitates. This guy is
bragging about holes in the prop that make it cavitate more. This
isn't a prop, it is a bubble machine.


See thunder's post.

I saw Thunder's post and he is guessing too.
Somebody show me a side by side test with a regular cheap aluminum
prop (not even some special high performance SS) and I will be
convinced.
My bet, at least a 10% decrease in performance on a barge like mine
and probably more like 25% a performance boat. There is no accident
props are made like they are. This is a century old technology and
they improve them every year, basically by doing the opposite of what
this guy is doing. (thinner blades, sharper edges) That is why people
spend the money for stainless steel. It is hard enough to hold that
edge. Guys spend $50-100 bucks to get them cleaned up when they get
tiny dings in them.

I am not even convinced that if you actually hit someone in the water
it would make that much difference. It is a lot easier to knock the
arm out of the way, from the side, in free air. Would you try it? None
of this would affect going straight into the prop.


But, you're not guessing... no way. You have the FACTS. Sure.

--
Nom=de=Plume