[TowerTalk] aluminum mast

[thompson@mindspring.com]

7075-T6 must be special made in Arizona (according to Tull Metals).  Its for
use in the space program and HD industrial applications.   I found this out
when buying parts for the Mexican Space Program as the University of Mexico
(UNAM) UNAMSAT30.  Its just luck if the have some in stock.

Dave K4JRB

>
>OK, I give up.
>
>I have been trying for DAYS to find a source of 2" OD, 0.375" wall 7075-T6
>extruded aluminum tubing.
>
>Nobody seems to have any.  I have called more than 9 places, from coast to
>coast.  Only an Iranian website had any hope of providing this stuff, and
>I'll be damned if I have to buy it from the Iranians.
>
>I need at least a 16' long piece, and would take as much as 20' if I had
>to, in order to get it.  I do not want to weld 2 pieces together.
>
>I need the aluminum because I have a weight restriction, and steel is just
>too heavy for my application.  I am fully aware that this material runs $40
>a foot, versus chrome-moly 4043 at $20 or so.
>
>The aluminum weighs 2 1/4 lbs. a foot, and the steel is between 6 1/2 and 7
>1/2 lbs. foot.  That's 36 lbs. versus 120 lbs.!  I'll pay for the aluminum.
>
>And yes, I am also aware that the yield strength is lower... 110 kpsi
>versus 73 kpsi.  My calculations show I need 59 kpsi to survive a 90 mph
wind.
>
>Can anyone help with a source for this 'rare' pipe?
>
>Replies via the reflector, or e-mail at sjackson@baynetworks.com, or
>telephone 800-343-8977 ext. 29045.
>
>TIA 73 Steve KZ1X/4
>
>
>
>--
>FAQ on WWW:               http://www.contesting.com/towertalkfaq.html
>Submissions:              towertalk@contesting.com
>Administrative requests:  towertalk-REQUEST@contesting.com
>Problems:                 owner-towertalk@contesting.com
>Search:                   http://www.contesting.com/km9p/search.htm
>



--
FAQ on WWW:               http://www.contesting.com/towertalkfaq.html
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm