Have you seen these?

www.rocksaltboats.com

Eisboch

"Eisboch" wrote in message
...
Have you seen these?

www.rocksaltboats.com

Eisboch



Also .... check your mail. I sent some interesting information for you.

Eisboch

Eisboch wrote:

Also .... check your mail. I sent some interesting information for you.

Eisboch


HEY! That's not fair!!! Having a private email conversation and not
allowing the NG nutjobs here to inject their political opinions into
EVERY boating thread might be a violation of protocol. I need to re-read
the official rules and get back to you.

On Sun, 23 Mar 2008 03:04:17 -0400, "Eisboch" wrote:

Have you seen these?

www.rocksaltboats.com

I haven't seen one as I don't think they've actually built one yet - I
think they are in process of building one, but I am aware of this
model.

From it's description, it's going to be quite the boat.

On Sun, 23 Mar 2008 10:35:46 -0400, DownTime
wrote:

Eisboch wrote:

Also .... check your mail. I sent some interesting information for you.

HEY! That's not fair!!! Having a private email conversation and not
allowing the NG nutjobs here to inject their political opinions into
EVERY boating thread might be a violation of protocol. I need to re-read
the official rules and get back to you.

This was a coded message - that's because we're plotting to take over
the world. And making a list - one of THOSE lists.

And now your name is on it.

Eisboch has all that executive experience, I figured I'd take
advantage of it and make him Grand Poobah of Everything while I, in my
role of Exhalted High and Mighty Galactic Overlord can ideate.

It's all about ideating.

And sleeping at a Holiday Inn Express at night. :)

Short Wave Sportfishing wrote:
On Sun, 23 Mar 2008 03:04:17 -0400, "Eisboch" wrote:

Have you seen these?

www.rocksaltboats.com

I haven't seen one as I don't think they've actually built one yet - I
think they are in process of building one, but I am aware of this
model.

From it's description, it's going to be quite the boat.

That's a very nice looking craft from what I can tell, but I wonder
what "Marine grade aluminum" is?

Some type of alloy? And I wonder how it would hold up to yearsa of
salt water and electrolysis?

On Mon, 24 Mar 2008 11:03:09 -0700 (PDT), Tim
wrote:



Short Wave Sportfishing wrote:
On Sun, 23 Mar 2008 03:04:17 -0400, "Eisboch" wrote:

Have you seen these?

www.rocksaltboats.com

I haven't seen one as I don't think they've actually built one yet - I
think they are in process of building one, but I am aware of this
model.

From it's description, it's going to be quite the boat.

That's a very nice looking craft from what I can tell, but I wonder
what "Marine grade aluminum" is?

Some type of alloy? And I wonder how it would hold up to yearsa of
salt water and electrolysis?

When they say alloy, it's generally a percentage of magnesium and a
couple of other trace elements. Most aluminum boats are made from
5000 series aluminum/magnesium alloy - the differences are in the
amount of mgnesium per use specifications.

As to strength - almost forever. There was an experiment done by
ALCOA (which is referenced by almost all aluminum boat manufacturers)
WAY back when with long term exposure and they stopped the experiment
with the 5000 series aluminum because nothing happened - zero, zip,
nada.

The main problem with aluminum has been fabrication - for years (much
like steel as well), the only true way to built an aluminum boat was
rivets, but as welding techniques improved, it became viable to start
producing welded hulls with plate aluminum instead of sheet.

With modern etching, paint and powder coating techniques, aluminum
will last a long time with little or no corrosion.

Short Wave Sportfishing wrote:
On Mon, 24 Mar 2008 11:03:09 -0700 (PDT), Tim
wrote:



Short Wave Sportfishing wrote:
On Sun, 23 Mar 2008 03:04:17 -0400, "Eisboch" wrote:

Have you seen these?

www.rocksaltboats.com

I haven't seen one as I don't think they've actually built one yet - I
think they are in process of building one, but I am aware of this
model.

From it's description, it's going to be quite the boat.

That's a very nice looking craft from what I can tell, but I wonder
what "Marine grade aluminum" is?

Some type of alloy? And I wonder how it would hold up to yearsa of
salt water and electrolysis?

When they say alloy, it's generally a percentage of magnesium and a
couple of other trace elements. Most aluminum boats are made from
5000 series aluminum/magnesium alloy - the differences are in the
amount of mgnesium per use specifications.

As to strength - almost forever. There was an experiment done by
ALCOA (which is referenced by almost all aluminum boat manufacturers)
WAY back when with long term exposure and they stopped the experiment
with the 5000 series aluminum because nothing happened - zero, zip,
nada.

The main problem with aluminum has been fabrication - for years (much
like steel as well), the only true way to built an aluminum boat was
rivets, but as welding techniques improved, it became viable to start
producing welded hulls with plate aluminum instead of sheet.

With modern etching, paint and powder coating techniques, aluminum
will last a long time with little or no corrosion.

Sounds good to me. I have a little dingy kind fo thing that was made
back in the 50's that was all rivet None of the strategic ones are
loose but some on the top side are. like the oar mounts and back where
the engine mount was.

"Tim" wrote in message
...



That's a very nice looking craft from what I can tell, but I wonder
what "Marine grade aluminum" is?

Some type of alloy? And I wonder how it would hold up to yearsa of
salt water and electrolysis?


Aluminum is made in many different alloys to achieve certain general
characteristics. I think the RockSalt boats are made of a series 5000 alloy
which has desirable attributes such as strength, weldability, and corrosion
resistance, particularly in marine applications.

Aluminum in general is a "self sealing" metal in terms of corrosion
resistance. If you scratch aluminum hard enough to get to the raw metal,
it quickly reacts with oxygen to form aluminum oxide on the surface of the
fresh metal. If I remember correctly, about 50 angstroms will form almost
immediately, then continue to build over time until the metal molecules are
no longer in contact with oxygen and the oxide barrier will stop growing.
BTW, aluminum oxide is non-conductive. That doesn't mean the boat won't
conduct electricity because the oxide layer is relatively thin (few microns)
and will break down at a high enough voltage. Often, though, low voltage
(like 12 volts) connections are difficult to properly make unless you
scrape off the oxide and make the connection before the oxide rebuilds.

Eisboch

"Eisboch" wrote in message
...

"Tim" wrote in message
...



That's a very nice looking craft from what I can tell, but I wonder
what "Marine grade aluminum" is?

Some type of alloy? And I wonder how it would hold up to yearsa of
salt water and electrolysis?


Aluminum is made in many different alloys to achieve certain general
characteristics. I think the RockSalt boats are made of a series 5000
alloy which has desirable attributes such as strength, weldability, and
corrosion resistance, particularly in marine applications.

Aluminum in general is a "self sealing" metal in terms of corrosion
resistance. If you scratch aluminum hard enough to get to the raw metal,
it quickly reacts with oxygen to form aluminum oxide on the surface of the
fresh metal. If I remember correctly, about 50 angstroms will form almost
immediately, then continue to build over time until the metal molecules
are no longer in contact with oxygen and the oxide barrier will stop
growing. BTW, aluminum oxide is non-conductive. That doesn't mean the
boat won't conduct electricity because the oxide layer is relatively thin
(few microns) and will break down at a high enough voltage. Often,
though, low voltage (like 12 volts) connections are difficult to
properly make unless you scrape off the oxide and make the connection
before the oxide rebuilds.

Eisboch


Forgot to include this link regarding aluminum alloys :

http://www.materialsengineer.com/E-Aluminum.htm

Eisboch