I have no idea what the strength is but I have a 2 inch (3/8 wall) x 24 foot
mast with about 15 feet out of tower and 9 feet inside tower at a location that
has been installed for 39 years. It has had a 4 element 20 up 7.5 feet on the
mast and a 4 element 15 at the top all that time. For 35 of those years it
also had a short 2 element 40 just above the tower. The mast is quite heavy
with a 3/8" wall, but I'm convinced based on its longevity it is pretty strong.
However, I have no idea how to equate 3/8 wall out of tower by 15 feet as
compared to 1/4 inch wall out of tower by 10 feet nor do I know what you are
planning to put on it.
73...Stan, K5GO
Sent from my iPad
On Feb 24, 2014, at 11:39 AM, Chris Pinholster <k4win@mac.com> wrote:
> I have been researching tower mast material. Both aluminum and steel.
>
> If aluminum 60601 tubing with 2"OD and .125 wall fails at 35000 ps, what
> happens when you increase wall thickness?
>
> If you increase the thickness of the mast wall, wouldn't that increase make a
> difference in the bend or failure rating?
> The charts at the metal company I visited seemed to indicate that would be
> true. (I was looking at aluminum 2"OD and 1.5"ID)
>
> Also I ran across a chart that showed that using a 14 ft mast, with 4 ft
> inside the tower and 10 ft above was stronger than an 11 ft mast with only
> 1ft inside the tower and 10 ft above.
>
> Any opinion or science from this learned group?
>
>
>
> CHRIS PINHOLSTER
> k4win@mac.com
>
>
>
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