[rollei_list] Re: I'm back!

  • From: Jerry Lehrer <jerryleh@xxxxxxxxxxx>
  • To: rollei_list@xxxxxxxxxxxxx
  • Date: Thu, 06 Jul 2006 19:48:31 -0700

Kieth,

WOW! Are you wrong!  The majority of commercial
aircraft, from the 707 to the 777 have their outer skins
on the wing, fuselage and empennage made of clad
aluminium.  Mostly clad one side, because the inner
surface is usually machined or chem-milled and protected
with a zinc chromate or phenolic primer.

Several years ago, I checked the skin panels of Air Force
One, the older 707.  All the cladding had been polished
or buffed away due to the regular shine-ups.

Jerry

keith_w wrote:

> Don Williams wrote:
> > At 04:28 PM 7/6/2006 -0700, Keith wrote:
> >> "Bi-metal?" Please explain, Don.
> >>
> >> the only bi-metal I know is in a thermostat!  ;-)
> >>
> >> keith
>
> > Keith, time to expand your range of knowledge.  Sounds like you missed
> > the buildup of air power during WWII.
> >
> > Look up alclad.  Jerry knows all about it.
>
> I know a little about alclad materials.
> Seems to me the need for such an alloy or construct has gone away as a result
> of many sophisticated advances in corrosion protection. What they do today was
> not even a gleam in a metallurgist's eye in 1945, let alone 1985!
> I'm making an educated guess here, but offhand I'd say, the need for Alclad®
> has gone the way of high-button shoes...
>
> keith whaley
>
> >  From one website there is a definition:
> >
> > *Alclad Sheet* - A composite sheet having , on both surfaces, a
> > metallurgically bonded aluminium or aluminium alloy coating which is
> > anodic to the core alloy to which it is bonded, thus electrolytically
> > protecting the core alloy against corrosion. Alclad on-side sheet has
> > been treated on one surface only.
> >
> > Or, from a different company, have a look here:
> >
> > http://www.kaiseral.com/glossary_a.htm
> >
> > alclad was used in the manufacture of WW2 aircraft to combing the
> > strength of one aluminum alloy while protecting it from corrosion by
> > coating it with another, softer alloy.  Worked fine except where the
> > edges were exposed.  No problem if they were waxed or painted, and no
> > problem for the duration of the war.
> >
> > I have no idea whether alclad is in current use for non-composite
> > aircraft now, but Jerry will know.
> >
> > I think there have even been problems with cameras due to this effect,
> > the first Nikonos I think is a good example when folks didn't properly
> > care for them.
> >
> > Finally, bi-metallic thermostats are not very accurate, but they are
> > very cheap and that's why they are used in most low-end domestic
> > products.  You won't find them in an industrial system where fine
> > temperature control is required.
> >
> > Jerry?
> >
> > DAWAluminium Sheet, Aluminum Sheet
> >
> > Don Williams
> > La Jolla, CA
> ---
> Rollei List
>
> - Post to rollei_list@xxxxxxxxxxxxx
>
> - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe'
> in the subject field OR by logging into www.freelists.org
>
> - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with
> 'unsubscribe' in the subject field OR by logging into www.freelists.org
>
> - Online, searchable archives are available at
> //www.freelists.org/archives/rollei_list
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.0.394 / Virus Database: 268.9.9/382 - Release Date: 07/04/2006

---
Rollei List

- Post to rollei_list@xxxxxxxxxxxxx

- Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' 
in the subject field OR by logging into www.freelists.org

- Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 
'unsubscribe' in the subject field OR by logging into www.freelists.org

- Online, searchable archives are available at
//www.freelists.org/archives/rollei_list

Other related posts: