On Wed, 3 Dec 2008 11:28:46 -0800, "Calif Bill"
wrote:

The problem with lots of the aluminum ship structures was bad design. Lots
of cracks happening. So better designers were needed. Harry maybe?

Actually, since aluminum and steel have the same strength to weight
ratio, it would seem that someone heard rumors that aluminum is
lighter, and designed it that way. Lighter is weaker. Duh.

Casady

"Richard Casady" wrote in message
...
On Wed, 3 Dec 2008 11:28:46 -0800, "Calif Bill"
wrote:

The problem with lots of the aluminum ship structures was bad design.
Lots
of cracks happening. So better designers were needed. Harry maybe?

Actually, since aluminum and steel have the same strength to weight
ratio, it would seem that someone heard rumors that aluminum is
lighter, and designed it that way. Lighter is weaker. Duh.

Casady


Good grief.

Use steel in the places you need strength.
Use aluminum in the places you need light weight.
Use titanium when you need both.

Eisboch

On Thu, 4 Dec 2008 12:07:32 -0500, "Eisboch" wrote:


"Richard Casady" wrote in message
.. .
On Wed, 3 Dec 2008 11:28:46 -0800, "Calif Bill"
wrote:

The problem with lots of the aluminum ship structures was bad design.
Lots
of cracks happening. So better designers were needed. Harry maybe?

Actually, since aluminum and steel have the same strength to weight
ratio, it would seem that someone heard rumors that aluminum is
lighter, and designed it that way. Lighter is weaker. Duh.

Good grief.

Use steel in the places you need strength.
Use aluminum in the places you need light weight.
Use titanium when you need both.

I'm not an expert on steel or aluminum, but a few years ago I had to
do some research on this very subject.

As I understand it, and again this is remembering what I learned at
the time, the major difference between steel and aluminum is that
aluminum will reach it's failure point, given the same strength
standard, 40% sooner than steel.

Again, that's how I remember the issue.

I could be entirely wrong.

"Tom Francis - SWSports" wrote in
message ...
On Thu, 4 Dec 2008 12:07:32 -0500, "Eisboch" wrote:


"Richard Casady" wrote in message
. ..
On Wed, 3 Dec 2008 11:28:46 -0800, "Calif Bill"
wrote:

The problem with lots of the aluminum ship structures was bad design.
Lots
of cracks happening. So better designers were needed. Harry maybe?

Actually, since aluminum and steel have the same strength to weight
ratio, it would seem that someone heard rumors that aluminum is
lighter, and designed it that way. Lighter is weaker. Duh.

Good grief.

Use steel in the places you need strength.
Use aluminum in the places you need light weight.
Use titanium when you need both.

I'm not an expert on steel or aluminum, but a few years ago I had to
do some research on this very subject.

As I understand it, and again this is remembering what I learned at
the time, the major difference between steel and aluminum is that
aluminum will reach it's failure point, given the same strength
standard, 40% sooner than steel.

Again, that's how I remember the issue.

I could be entirely wrong.

There is no cycling rating for aluminum It will eventually crack if flexed.
Where as steel has a rating (B10?) where if the metal is not flexed beyond a
certain point will last forever.

On Thu, 4 Dec 2008 12:07:32 -0500, "Eisboch" wrote:

Use steel in the places you need strength.

You mean that's why airplanes use so very little of it?
Funny, I thought planes needed to be sturdy.

Casady

"Richard Casady" wrote in message
...
On Thu, 4 Dec 2008 12:07:32 -0500, "Eisboch" wrote:

Use steel in the places you need strength.

You mean that's why airplanes use so very little of it?
Funny, I thought planes needed to be sturdy.

Casady


Airplanes are safe because they are flexible and allowed to move within
their yield. The sturdiness is
a result of monocock frame design.

Eisboch

Eisboch wrote:
"Richard Casady" wrote in message
...
On Thu, 4 Dec 2008 12:07:32 -0500, "Eisboch" wrote:

Use steel in the places you need strength.
You mean that's why airplanes use so very little of it?
Funny, I thought planes needed to be sturdy.

Casady


Airplanes are safe because they are flexible and allowed to move within
their yield. The sturdiness is
a result of monocock frame design.

Eisboch




Are you referring to Monocock Lewinsky?

Or her sister, Monocoupe?

On Dec 4, 11:43*am, (Richard Casady)
wrote:
On Wed, 3 Dec 2008 11:28:46 -0800, "Calif Bill"

wrote:
The problem with lots of the aluminum ship structures was bad design. *Lots
of cracks happening. *So better designers were needed. *Harry maybe?

Actually, since aluminum and steel have the same strength to weight
ratio, it would seem that someone heard rumors that aluminum is
lighter, and designed it that way. Lighter is weaker. Duh.

Casady

Well, kind of. There are lots of variables that will put holes in that
blanket statement. If it were going to be a generality then you could
include wood, too.

Richard Casady wrote:
On Wed, 3 Dec 2008 11:28:46 -0800, "Calif Bill"
wrote:

The problem with lots of the aluminum ship structures was bad design. Lots
of cracks happening. So better designers were needed. Harry maybe?

Actually, since aluminum and steel have the same strength to weight
ratio, it would seem that someone heard rumors that aluminum is
lighter, and designed it that way. Lighter is weaker. Duh.

Casady


Gee, I just bought a carbon fiber tripod. Maybe they could make warships
out of that. It wouldn't be any more a waste of taxpayer money than what
they are doing now.

On Thu, 04 Dec 2008 14:20:20 -0500, Boater
wrote:

Richard Casady wrote:
On Wed, 3 Dec 2008 11:28:46 -0800, "Calif Bill"
wrote:

The problem with lots of the aluminum ship structures was bad design. Lots
of cracks happening. So better designers were needed. Harry maybe?

Actually, since aluminum and steel have the same strength to weight
ratio, it would seem that someone heard rumors that aluminum is
lighter, and designed it that way. Lighter is weaker. Duh.

Casady


Gee, I just bought a carbon fiber tripod. Maybe they could make warships
out of that. It wouldn't be any more a waste of taxpayer money than what
they are doing now.

In northern climes the ships could be made of ice.
The sailors would wear "penguin" dress and waddle.
Enemy recon would just see ice floes.
With penguins.

--Vic