See Figure 3.8.Ī) Compute by hand the direction L j of the wire L j, j = 1, 2, 3.ī) What is the length of each wire, and what are the coordinates of the points P 1, P 2, P 3 of attachment of each wire on the roof?Ĭ) Graph the roof, the antenna, and the three guy wires. Let the roof slope up from negative x to positive x. A guy-wire, guy rope, or guy-line is a tensioned cable that is designed and manufactured to help a free-standing structure maintain its stability. Introduce coordinates by putting the base of the pole at the origin (0,0,0) and the point where the wires are attached at (0, 0, 25). When viewed from above, they will each make an angle of 120 degrees with the first wire, one on either side. Two wires will be shorter and of equal length. The reason behind the name dates back to its first original use, which was attaching sails to a mast on ships. ![]() Guy wires are commonly used in radio masts, ship masts, fire service extension structures, wind turbines, utility poles, the cables are also utilized in church raises and tents. Anchor the wires 45 degrees from your pole using screw eyes set 120 degrees apart. A guy-wire, guy rope, or guy-line is a tensioned cable that is designed and manufactured to enhance the stability of a free-standing structure. To keep the guy wire from unraveling, wrap it around seven or eight times. Run the mast ends of the guy wire through the holes in the ring. The otherįigure 3.8 Antenna on roof for Exercise 13. Clad in black and carrying a long pole for balance, Philippe Petit begins the most famous high-wire walk in history, calmly traversing the space between the Twin Towers at a height of 1,350 feet. Attach the wires to the upper half of each mast section before attaching the antenna. One of the wires is to be as long as possible and thus must go in the direction in which the roof slopes down. They are attached at a point 25 feet above the roof, and each is to make an angle of 30 degrees with the pole of the antenna. Three guy wires are to be stretched from the antenna to the roof. ![]() ![]() If we consider a horizontal cable with the origin at the centre of the span. The roof has a slope of 20 degrees from the horizontal. resulting from the action of the guy cables and guy outrigger.
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