Wanted - Propeller

[rogtwo@aol.com]

I broke a blade off one of my propellers today when I got stuck in some
gravel.

If you have an old propeller that you would like to sell, please e-mail me at
Rogtwo@aol.com.

I'm looking for a propeller that doesn't have too much physical damage, but I
don't care if it has cosmetic problems. My other propeller is painted, so
looks are not my top priority!

If you are looking for an excuse to replace both of your propellers with
shiny new ones, I would consider buying both of your old ones, if the price is
right.

Roger St. John
White '63
Seattle



[Non-text portions of this message have been removed]

 

[HAPPYHOUSE1024@CS.COM]

I FEEL YOUR PAIN. I HAVE 2 PROPS, 1 IS OK. I WILL LOOK IN MY GARAGE AFTER
WORK TODAY FOR YOU. I TOOK THEM OFF YEARS AGO WHEN I GOT SOME BRASS ONES. BRASS
IS SO COOL. GOTTA GO. E YOU LATER. NEMO.64 WHITE. PHX. AZ.


[Non-text portions of this message have been removed]

 

[cptcrnch56@aol.com]

Where did you obtain the brass props?

Frank in CT


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[a_colo_native]

--- In amphicar-lovers@yahoogroups.com, HAPPYHOUSE1024@C... wrote:
> I FEEL YOUR PAIN. I HAVE 2 PROPS, 1 IS OK. I WILL LOOK IN MY GARAGE
AFTER
> WORK TODAY FOR YOU. I TOOK THEM OFF YEARS AGO WHEN I GOT SOME BRASS
ONES. BRASS
> IS SO COOL. GOTTA GO. E YOU LATER. NEMO.64 WHITE. PHX. AZ.
>

Brass props are a bad idea! If you think breaking a plastic prop is
expensive, wait until you hit something with the brass prop and do
serious damage to your transmission! The reason the props are plastic
is so they break and not your trans. Brass looks cool, but the cost
of a trans rebuild is not worth the trade. JMNSHO

John
<{{{=<

 

[rogtwo@aol.com]

Re: Re: Wanted - Propeller

"I particularly like the idead because the rear edges of a bronze prop
can be cupped which would help reduce Amphicar's high speed cavitation
problem a lot."

Cavitation???

With the large blade area of the propellers and limited horsepower of our
Amphi's, cavitation seems most unlikely. Cavitation occurs when there is a
local
low-pressure area on part of the propeller blade. These low pressure areas
are in turn created by heavy blade loading due to little blade area trying to
push too hard. With two propellers, our Amphis probably have twice the blade
area of a typical 50 hp outboard motor.

What indication have you seen that there is cavitation? Cavitation is almost
always diagnosed because it creates pitting of the propeller blades. This
pitting would be on the low-pressure side of the propeller (that would be the
side you DON'T see when you look under the back of the car). The pitting is
often worse near the root of the blade. Have you seen such pitting?

Roger
White '63
Seattle

PS - I'll be away for 2 weeks, so I can discuss it more when I get back.


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[John Friese]

--- In amphicar-lovers@yahoogroups.com, "a_colo_native" <minnow@a...>
wrote:
> --- In amphicar-lovers@yahoogroups.com, HAPPYHOUSE1024@C... wrote:
> > I FEEL YOUR PAIN. I HAVE 2 PROPS, 1 IS OK. I WILL LOOK IN MY GARAGE
> AFTER
> > WORK TODAY FOR YOU. I TOOK THEM OFF YEARS AGO WHEN I GOT SOME BRASS
> ONES. BRASS
> > IS SO COOL. GOTTA GO. E YOU LATER. NEMO.64 WHITE. PHX. AZ.
> >
>
> Brass props are a bad idea! If you think breaking a plastic prop is
> expensive, wait until you hit something with the brass prop and do
> serious damage to your transmission! The reason the props are plastic
> is so they break and not your trans. Brass looks cool, but the cost
> of a trans rebuild is not worth the trade. JMNSHO
>
> John
> <{{{=<

I think the brass (or bronze) props are a good idea but you would have
to replace the steel keyways with aluminum ones to provide a shear
capability in case of hitting something. This would avoid the tranny
damage that the Colorado Native worries about.
I particularly like the idead because the rear edges of a bronze prop
can be cupped which would help reduce Amphicar's high speed cavitation
problem a lot.

John Friese

 

[Al Heath]

>> Brass props...

One thing to thing about with brass props is what happens when they get
tangled up with something? The original amphi props will break long before
the torque could twist something else. Is it better to be "dead in the
water" or "backing up on one prop", versus snapping something else in the
car? What kind of shear pin arrangement are you using?

Al

 

[tommyintpa@aol.com]

Re: Re: Wanted - Propeller

In a message dated 6/30/03 8:39:15 AM Pacific Daylight Time,
jfriese@mindspring.com writes:


> I think the brass (or bronze) props are a good idea but you would have
> to replace the steel keyways with aluminum ones to provide a shear
> capability in case of hitting something. This would avoid the tranny
> damage that the Colorado Native worries about.
> I particularly like the idead because the rear edges of a bronze prop
> can be cupped which would help reduce Amphicar's high speed cavitation
> problem a lot.
>
> John Friese
>
>
>

Hi John
Do you think you can get shear pins that would give up without taking out the
tranny?
Brass props sound soo cool.
But Captain Fishbone has a good point too.
Tommy in Tampa
Red '68 Weird Harold


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[John Friese]

--- In amphicar-lovers@yahoogroups.com, rogtwo@a... wrote:
> "I particularly like the idead because the rear edges of a bronze prop
> can be cupped which would help reduce Amphicar's high speed cavitation
> problem a lot."
>
> Cavitation???
>
> With the large blade area of the propellers and limited horsepower
of our
> Amphi's, cavitation seems most unlikely. Cavitation occurs when
there is a local
> low-pressure area on part of the propeller blade. These low
pressure areas
> are in turn created by heavy blade loading due to little blade area
trying to
> push too hard. With two propellers, our Amphis probably have twice
the blade
> area of a typical 50 hp outboard motor.
>
> What indication have you seen that there is cavitation? Cavitation
is almost
> always diagnosed because it creates pitting of the propeller blades.
This
> pitting would be on the low-pressure side of the propeller (that
would be the
> side you DON'T see when you look under the back of the car). The
pitting is
> often worse near the root of the blade. Have you seen such pitting?
>
> Roger
> White '63
> Seattle
>
> PS - I'll be away for 2 weeks, so I can discuss it more when I get back.

Roger,

Both my Amphicars have significant cavitation when operating at high
speed (3000 RPM and over). It is understandably less when passengers
are in the back of the car. This cavitation is inevitable because the
props are well above the bottom of the boat and at speed the water
won't follow the hull line up the into the tunnels, thus the props
tend to grab the air. Years ago, when I was racing outboard boats, we
ran the engines with the props significantly above the rear of the
boat and cavitation was impossibly high unless we cupped the rear edge
of the prop. I don't really know why this works so well but my
experience says it does. A bronze or brass propeller would also have
a thinner blade cross section and I suspect that would improve
propeller efficiency too.

John Friese
>
>
> [Non-text portions of this message have been removed]

 

[tommyintpa@aol.com]

Re: Re: Wanted - Propeller

In a message dated 6/30/03 4:09:46 PM Pacific Daylight Time,
jfriese@mindspring.com writes:


> That would be a bummer since I suspect Amphi's will
> only run in cirles with one prop out of commision.
>
> John Friese
>
>
>

Hi again, You can go backwards, not to bad, for a long - long way better
than foward - honest
Tommy in Tampa


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[John Friese]

--- In amphicar-lovers@yahoogroups.com, tommyintpa@a... wrote:
> In a message dated 6/30/03 8:39:15 AM Pacific Daylight Time,
> jfriese@m... writes:
>
>
> > I think the brass (or bronze) props are a good idea but you would have
> > to replace the steel keyways with aluminum ones to provide a shear
> > capability in case of hitting something. This would avoid the tranny
> > damage that the Colorado Native worries about.
> > I particularly like the idead because the rear edges of a bronze prop
> > can be cupped which would help reduce Amphicar's high speed cavitation
> > problem a lot.
> >
> > John Friese
> >
> >
> >
>
> Hi John
> Do you think you can get shear pins that would give up without
taking out the
> tranny?
> Brass props sound soo cool.
> But Captain Fishbone has a good point too.
> Tommy in Tampa
> Red '68 Weird Harold

Hi Tommy,

Given that everything in the drive line, including the transmission
gears is steel, I would think that reproducing the steel key in
aluminum would do the trick. That doesn't seem too difficult. The
trick is to have the key break somewhat before damage is done to the
drive system but, I'm afraid, long after a nasty ding has occured to
the bronze prop. If you make the key too weak, it might snap during
normal loading. That would be a bummer since I suspect Amphi's will
only run in cirles with one prop out of commision.

John Friese


>
> [Non-text portions of this message have been removed]

 

[HAPPYHOUSE1024@CS.COM]

Re: Re: Wanted - Propeller

hey john, im the guy with brass props. thanks for the tip on alum. pins.
where could i get some? NEMO. 64 WHITE.


[Non-text portions of this message have been removed]

 

[Ed Price]

Re: Re: Wanted - Propeller

----- Original Message -----
From: HAPPYHOUSE1024@CS.COM
To: amphicar-lovers@yahoogroups.com
Sent: Tuesday, July 01, 2003 7:11 AM
Subject: Re: [amphicar-lovers] Re: Wanted - Propeller


hey john, im the guy with brass props. thanks for the tip on alum. pins.
where could i get some? NEMO. 64 WHITE.




Nemo:

In addition to the list that you have been posting on, there is a very
supportive International Amphicars Owners Club. For one thing, membership gets
you access to a detailed service manual. Suggest you join.

http://www.amphicar.com

Also, geography is not always our friend. I suggest you put a location
descriptor in your sig, so that you can get to know those near you. I'm assuming
that you must be somewhere in the Southwest, so maybe my SoCal reference may be
of some help. (San Diego is a major Amphi center!)

Successful restoration needs networking! As for parts and an estimate of typical
work, call Gordon in Santa Fe Springs. Get his catalog of Amphi parts.

Ed
El Cajon
67 Rust Guppy





[Non-text portions of this message have been removed]

 

[Ed Price]

Re: Re: Wanted - Propeller

----- Original Message -----
From: HAPPYHOUSE1024@CS.COM
To: amphicar-lovers@yahoogroups.com
Sent: Tuesday, July 01, 2003 7:11 AM
Subject: Re: [amphicar-lovers] Re: Wanted - Propeller


hey john, im the guy with brass props. thanks for the tip on alum. pins.
where could i get some? NEMO. 64 WHITE.


What is the make & model of those props?

Ed
El Cajon
67 Rust Guppy


[Non-text portions of this message have been removed]

 

[John Friese]

--- In amphicar-lovers@yahoogroups.com, HAPPYHOUSE1024@C... wrote:
> hey john, im the guy with brass props. thanks for the tip on alum.
pins.
> where could i get some? NEMO. 64 WHITE.
>
>
You might be able to buy such a thing but making some up from a piece
of aluminum sheet (of suitable thickness) would be easy enough. You
might check with a machinst to see if they can be bought. If not, he
can probably supply you with some himself by just making them up.

John Friese

White 67
Red 67