On Tue, 3 Aug 2004 21:09:23 -0400 "Tom Rauch" <w8ji@contesting.com>
writes:
> When the tower twists all three
> guylines have to reach a longer distance, tension increases
> a large amount.
It's not the increase in tension that's the dominant
factor, it's the fact that once the tower twists, all
three guy wires move _sideways_, and are no longer in
line with the center of rotation of the tower. Therefore,
they exert a significant torque to rotate the tower back
in line with the guy points.
I don't know how long these torque bars are, but let's
assume 24 inches. Assume Rohn 25, which has a distance from
rotation center to leg of about 5 inches. If the torque
bar is 24" long, and is bent down at 45 degrees (the guy angle),
it will increase the sideways distance that the guy wire moves
by 24 x .707 = 17 inches. So, you have more than quadrupled
[(17+5)/5 = 4.4] the rotation resistance of the guy system by
adding the torque bars.
Dave Hachadorian, K6LL
Big Bear Lake, CA
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