Hi Rudy, 6061-T6 aluminum has a yield strength rating the same as 6063-T832
that is sold by Texas Towers and others.
The 6061-T6 costs more than 6063-T832 because of the extra
heating/quenching steps needed to reach the rated yield strength. 6063-T832
reaches the
rated yield strength by work hardening the material in the drawing process.
If you want a self supporting vertical, then you would need to go through
the same process as designing a 80 meter beam element with most of the
material weight left out of the calculations. Just as a guess I would expect
the
bottom section to be about 4" diameter with a .25" wall.
This is not a trivial structure! Please proceed with caution!
If you want a guyed vertical, there are a number of them that have been on
the air long enough to think about duplicating one. W5UN is one that comes
to mind.
73,
Gerald K5GW
In a message dated 10/13/2012 4:09:30 P.M. Central Daylight Time,
r_bakalov@yahoo.com writes:
I was wondering if anyone can help me select the right material for
full-size 80m verticals. My questions are as follows:
1) metalsupermarkets.com offers 6061-T6 aluminum, but not T8. Is there a
difference between T6 and T8 for my purpose?
2) Should go for the 0.125 or 0.065 wall thickness?
3) Is 1" tubing OK for the topmost segment? Too stiff for the wind at 70'?
Not strong enough?
I am aware that many ham stores offer 6061-T8 tubing, but I do want to buy
it local in VE3, close to my QTH, in 12' lengths (instead of 6') and avoid
shipping complications due to length or clearing customs.
73 Rudy N2WQ
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|