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Aluminum is good in salt water | 226 comments | Create New Account
Comments belong to whoever posts them. Please notify us of inappropriate comments.
Steve Jobs Yacht Venus
Authored by: Anonymous on Monday, October 29 2012 @ 03:01 PM EDT
No

A lot of modern high speed passenger ferries have aluminium
alloy hulls.
Hulls also have anodised surfaces and sacrificial anodes to
counteract corrosion.

I don't know about modern aircraft, so you may well be
right, but I would guess that as weight is much more
critical they are probably using alloys with higher strength
to weight ratios.

e.g magnesium/ aluminium alloys.

one news item I did see not long ago was of the wreck of a
second world war fighter being recovered from the sea.
it certainly looked like a good bit of the alloy panels were
still relatively intact despite having been in there for 60
odd years.

[ Reply to This | Parent | # ]

Aluminum hulls
Authored by: bugstomper on Monday, October 29 2012 @ 03:07 PM EDT
A bit of googling shows plenty of literature on how to build aluminum hulls for
salt water ships, with advice on things like avoiding grounding any electrical
equipment to the hull, use of sacrificial anodes of zinc or zinc-aluminum alloy,
etc. In other words, presumably Steve Jobs made use of the expertise of real
boat designers and did not naively insist on the construction of something that
looks good but would not work.

[ Reply to This | Parent | # ]

Vanderdecken
Authored by: BJ on Monday, October 29 2012 @ 03:15 PM EDT
Venus, in modern American mobile IT legend, spectre ship doomed
to sail forever; its appearance to Samsung is believed to signal
imminent disaster. In the most common version, the captain, Jobs,
gambles his salvation on a rash pledge to round the corners of
the iPad of Good Hope during a storm and so is condemned to that
course for eternity.


bjd



N.B.:
free, after
http://www.britannica.com/EBchecked/topic/211656/Flying-Dutchman#ref172463 :

Flying Dutchman, in European maritime legend, spectre ship doomed
to sail forever; its appearance to seamen is believed to signal
imminent disaster. In the most common version, the captain,
Vanderdecken, gambles his salvation on a rash pledge to round
the Cape of Good Hope during a storm and so is condemned to that
course for eternity.



[ Reply to This | Parent | # ]

Steve Jobs Yacht Venus
Authored by: Anonymous on Monday, October 29 2012 @ 03:33 PM EDT
I think you will find that Jobs "designed" the ship in the same way he
"designed" phones. He contracted with a company to build something,
gave them his vague aspirational goals, and then said "no" to 27
different designs until he approved a 28th that was really the first design with
the date on the drawing changed.

[ Reply to This | Parent | # ]

What's with the big boats?
Authored by: Anonymous on Monday, October 29 2012 @ 06:22 PM EDT
Maybe Steve wanted to be more like his good friend Larry (Ellison).

[ Reply to This | Parent | # ]

Steve Jobs Yacht Venus
Authored by: tiger99 on Monday, October 29 2012 @ 06:46 PM EDT
Despite differing opinions about the corrosion problem, there remains the
problem of the finite fatigue life of all aluminium structures which are subject
to dynamic loads, as ships are, especially in a rough sea. Mild steel, with any
normal safety factor, lasts for ever, ali does not.

[ Reply to This | Parent | # ]

Dieter Rams and Frank Lloyd Wright?
Authored by: Anonymous on Monday, October 29 2012 @ 10:56 PM EDT
The "Starck" design melds elements of Dieter Rams and Frank Lloyd Wright.

arstechnica

I don't have either of them listed as Naval Architects.

[ Reply to This | Parent | # ]

Aluminum is good in salt water
Authored by: argee on Monday, October 29 2012 @ 11:10 PM EDT
Aluminum does not corrode in salt water. SOME aluminum
alloys will, specially those that contain copper.

Marine aluminum is the 5000 series and is inert in sea
water.

However, anything electrically connected to the hull, made
of a different metal, will start galvanic current to the
detriment of the hull. This would include prop shafts,
propellers and most notably, steel piers and OTHER BOATS
tied to the dock because they are all connected together
by the ground wire in shore power.

As was said, zinc anodes can be applied to the hull.
The galvanic action is opposite; ie, zinc yields to the
aluminum, but more importantly, when there is iron or
copper in the vicinity, the galvanic current will flow
first to the zinc anode leaving the aluminum hull safe.

Although you need to take care of your aluminum hull, it
is nevertheless much easier to deal with than with a
steel hull. Steel simply corrodes in seawater and needs
all sorts of fancy paints and coatings. Aluminum in
seawater almost instantly builds a patina of aluminum
oxide that is 100% protection against corrosion (other
than the galvanic corrosion just mentioned).

I've built a number of welded aluminum boats, and worked
on others, and they are very, very good. Easy to work
with, easy to weld, stronger and stiffer than steel, etc.
Costs a bit more for the metal, but the labor to build is
a lot less.

Having said all that, Steve Jobs' boat is one UGLY boat.
No wonder they kept it hidden in that boat hangar, not
to be revealed until after his death.

---
--
argee

[ Reply to This | Parent | # ]

Don't forget the shape and it's relation to the environment
Authored by: Anonymous on Tuesday, October 30 2012 @ 12:01 PM EDT

It's certainly not very aerodynamic - which would lead one to think of the potential for an increase in fuel consumption.

RAS

[ Reply to This | Parent | # ]

Should have been named 'Hubris'...n/t
Authored by: albert on Tuesday, October 30 2012 @ 12:20 PM EDT
.

[ Reply to This | Parent | # ]

Steve Jobs Yacht Venus
Authored by: Anonymous on Tuesday, October 30 2012 @ 01:16 PM EDT
Venus ... It's a rather unfortunate name for a ship.

hairbear

[ Reply to This | Parent | # ]

Why Jobs' new Yacht seems familiar
Authored by: Anonymous on Tuesday, October 30 2012 @ 06:26 PM EDT

When I first saw it, it looked vaguely familiar.

I now know why:

    If Leggo built a toy boat, it would look blocky like Jobs' Yacht!

RAS

[ Reply to This | Parent | # ]

  • I stand corrected - Authored by: Anonymous on Tuesday, October 30 2012 @ 06:40 PM EDT
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