t familiar speed-course method is probably that in which the airplane is flown in opposite directions along a straight ground course between two points. In the general case there would be a wind velocity inclined at an angle 6 to the ground course, so that the cross- wind component (perpendicular… … where V is the average true air speed in miles per hour. L, the length of the course in feet. t j_ and tg, the times in seconds for runs in op- posite directions.
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