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Vector Plots To vectorially add the weighted wind speeds and directions, you must construct a wind vector plot as follows: 1. Label GZ and the GN line. Table 6-9-5.-Weight Factors to Obtain EDF Speed in Knots
Table 6-9-6.-Weight Factors to Obtain EDF Speed in Kilometers-per-hour
2. From GZ, plot (draw) the first vector toward the downwind direction. Vector length can be made to a scale of your choice. For example, if you want 1 knot to equal 2 centimeters, a 10-knot wind will result in a vector length of 20 centimeters.3. Draw the second vector from the end of the first vector. You proceed in this manner up to the yield level with which you are working.4. After drawing the last vector, draw a straight line from GZ to the end of the last vector. This is the effective downwind direction. 5. To obtain the effective downwind speed, measure the straight-line distance between GZ and the end of the last vector and convert the distance in centimeters into knots. |
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