In a message dated 9/2/03 3:22:40 PM Pacific Daylight Time,
stetrekve@yahoo.com writes:
> Thanks for the reply. The 16" should read be 16 feet
> for the approximate mast out of the top of the tower.
> The 2 meter antenna is: 2.7 sq ft
> The 6 meter antenna is: 2.5 sq ft
> The Force 12 C32XR is: 10.7 sq ft, weight. 82 lb
> Force 12 HF beam 1 foot above top of tower. 6 meter
> beam 6 feet above HF beam and 2 meter beam 6 feet
> above the 6 meter beam.
Hi, Steve --
The bending moment is 18,641 in-lbs. The mast recommended needs a yield
strength of 42,000 psi and 0.188" wall.
Since the yield strength of the of 6061-T6 is 35,000 psi, you're pretty
close to a potential failure. One thing you can do is to move the antennas
closer together. Or go to a steel alloy mast. Or put a piece of steel inside
the
bottom of the mast to strengthen up the place where it's going to bend - right
at the thrust bearing.
Cheers,
Steve K7LXC
TOWER TECH
Champion Radio Products
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