I purchased 2 props (both alumininum) to reprop with.
The guy agreed with me that if I hit stuff; it's better to destroy the prop than
the outsdrive -- but for performance, a ss is the way to go.

he said the weight issue is silly because it's underwater and doesn't weigh as
much and that no one would use ss if it wore out the outdrive faster.

So -- Here I am; for curiosity sake; asking you if the weight of a ss prop
really does wear out the drive faster than an aluminum one.

-j

"Josh Assing" wrote in message
...
I purchased 2 props (both alumininum) to reprop with.
The guy agreed with me that if I hit stuff; it's better to destroy the
prop than
the outsdrive -- but for performance, a ss is the way to go.

he said the weight issue is silly because it's underwater and doesn't
weigh as
much and that no one would use ss if it wore out the outdrive faster.

So -- Here I am; for curiosity sake; asking you if the weight of a ss prop
really does wear out the drive faster than an aluminum one.

It's not the weight per-se, it's the inertia of the static ss propeller mass
when you shift into gear from neutral that wears the dogs a little faster
than aluminum. Once it's actually spinning all is pretty much equel.

-W

So -- Here I am; for curiosity sake; asking you if the weight of a ss prop
really does wear out the drive faster than an aluminum one.

-j

fwiw ... I was advised by the dealer to step down in pitch e.g. 23" to
21" when going from aluminum to SS. Never looked into it further, but
a step down would imo reduce stress on the outdrive.

"bowgus" wrote in message
ps.com...

So -- Here I am; for curiosity sake; asking you if the weight of a ss
prop
really does wear out the drive faster than an aluminum one.

-j

fwiw ... I was advised by the dealer to step down in pitch e.g. 23" to
21" when going from aluminum to SS. Never looked into it further, but
a step down would imo reduce stress on the outdrive.


Odd.... because WOT RPM's actually rise a bit going to SS.

-W

Clams Canino wrote:
"Josh Assing" wrote in message
...
I purchased 2 props (both alumininum) to reprop with.
The guy agreed with me that if I hit stuff; it's better to destroy the
prop than
the outsdrive -- but for performance, a ss is the way to go.

he said the weight issue is silly because it's underwater and doesn't
weigh as
much and that no one would use ss if it wore out the outdrive faster.

So -- Here I am; for curiosity sake; asking you if the weight of a ss prop
really does wear out the drive faster than an aluminum one.

It's not the weight per-se, it's the inertia of the static ss propeller mass
when you shift into gear from neutral that wears the dogs a little faster
than aluminum. Once it's actually spinning all is pretty much equel.

-W


Another argument to choose Volvo-Penta Over Mercruiser.

Rob

The reason for the step-down recommendation is because the aluminum flexes
and looses some pitch. Stainless does not.

--
Steve Barker

for the spam bots:






"bowgus" wrote in message
ps.com...

So -- Here I am; for curiosity sake; asking you if the weight of a ss
prop
really does wear out the drive faster than an aluminum one.

-j

fwiw ... I was advised by the dealer to step down in pitch e.g. 23" to
21" when going from aluminum to SS. Never looked into it further, but
a step down would imo reduce stress on the outdrive.

"Steve Barker" wrote in message
...
The reason for the step-down recommendation is because the aluminum flexes
and looses some pitch. Stainless does not.


Stainless props also typically have a more pronounced cup to them, which is
another good reason the drop in pitch is usually warranted when moving from
aluminum to stainless.

The pressure created by the prop pushing the boat is orders of magnitude
greater than anything you could attribute to spinning the weight of the
prop. The different between aluminum and ss would not be noticable.

"Josh Assing" wrote in message
...
I purchased 2 props (both alumininum) to reprop with.
The guy agreed with me that if I hit stuff; it's better to destroy the
prop than
the outsdrive -- but for performance, a ss is the way to go.

he said the weight issue is silly because it's underwater and doesn't
weigh as
much and that no one would use ss if it wore out the outdrive faster.

So -- Here I am; for curiosity sake; asking you if the weight of a ss prop
really does wear out the drive faster than an aluminum one.

-j

Steve Barker wrote:
The reason for the step-down recommendation is because the aluminum flexes

Prove it.

Rob

and looses some pitch. Stainless does not.

On Sat, 9 Jun 2007 07:31:36 -0500, "Steve Barker"
wrote:

The reason for the step-down recommendation is because the aluminum flexes
and looses some pitch. Stainless does not.


flexes - I think that's generally accepted; but flexes to the point of loosing
2" of pitch? I find that hard to believe.

On this theory; I'm giong to be way under propped as I had a SS 19 and I went to
an aluminum 17; so on your theory; this will be like a 15 pitch SS....