I have a question regarding computing guy tensions for an installation where
the 3 guy points and the tower base are not at the same elevation.
My guy posts are large I-beams that protrude 3.5 feet above ground level.
The referenced elevations are to the actual points on the I-beam where the
guy wires will attach. I used my bubble level (transit) to establish
elevations.
Tower Base = 0 inches
W guy point = +68 inches relative to tower base, at a distance from tower
base of 88 feet
SE guy point = +19 inches relative to tower base, at a distance from tower
base of 97 feet
NE guy point = - 48 inches relative to tower base, at a distance from tower
base of 113 feet
Using a tower guy point at + 100 feet (arbitrarily chosen for calculations),
I calculate the following angles, which are close but vary from guy post to
guy post
W = 47 degree angle with ground
SE = 45 degree angle with ground
NE = 43 degree angle with ground
I suppose I know just enough to be dangerous here. From physics classes
long ago, I believe that since the guy wire angles are different, it stands
to reason the tension in the wires needs to be different, because of the
vertical and horizontal components of the guy wire. However, I do not
remember those calculations. Before I go dig the formulas up, assuming my
angle calculations are correct, my question is simply:
Is there enough variance to matter?
Is there a "ready reference" anywhere for these calculations?
--Scott, W5WZ
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