[TowerTalk] Mast loading calc's
Mon, 2 Nov 1998 10:40:07 EST
In a message dated 98-11-02 09:12:02 EST, firstname.lastname@example.org writes:
> I need the formulas for wind loading and on a mast. And the constants for
> 2" water pipe.
They are all in W6NL, ex-W6QHS, Dave Leeson's book, "Physical Design of
Yagi Antennas". Buy a copy for your library.
> In particualr what is the max wind rating for 2" water pipe 10' high with 5
> Sq feet of antenna?
> or said another way
> How high above the tower can I go with 5 SQ ft of antenna using 2" water
> pipe for 85 MPH wind survivability?
According to my MARC Program (Mast, Antenna and Rotator Calculator),
five feet of mast @ 85MPH produces 9506 in-lbs of bending moment and
recommends a 32K psi yield strength mast with 0.120" wall. I think schedule
40/80 is somewhere around 25/30K psi. You could go a couple of feet but that's
The MARC Program is available from Champion Radio Products for only
$9.95. www.championradio.com or 888-833-3104 for more information.
Cheers, Steve K7LXC
Champion Radio Products
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