Equivalent Route Winds for Helicopter Air Routes at Heights of 5,000, 10,000, and 18,000 Feet. Volume I
BOEING VERTOL CO PHILADELPHIA PA
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Equivalent headwinds or equivalent winds are computed using Sawyers method for approximately 4400 strategic world air routes contained in Volumes I and 2. The seasonal mean equivalent wind and its standard deviation and the annual 50-, 75-, and 85- percent reliability equivalent winds are tabulated. Route winds are computed for the 5000-, 10,000-, and 18,000 foot levels. An IBM 36065 program was used to compute the equivalent winds. Input data for the program consist, for each level, of a grid composed of the mean vector wind and the standard vector deviation at the intersection of each 5 degrees of latitude with each 10 degrees of longitude between 60 degrees S and 60 degrees N and at the intersection of each 5 degrees of latitude and each 20 degrees of longitude south and north of 60 degrees S and 60 degrees N respectively. In addition to the equivalent winds, great circle distances are computed and tabulated for each route.