THE ACCURACY OF DRAG MEASUREMENTS AS A FUNCTION OF NUMBER AND DISTRIBUTION OF TIMING STATIONS
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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General formulae are given for the error to be expected in the drag coefficient of a projectile whose flight is observed over a given range containing timing stations distributed in an arbitrary manner. It is assumed that the time-distance relation can be represented by a cubic polynomial of the form t a0 a1z a2z-squared a3z-cubed. It is further assumed that the mean errors in time and distance are independent and constant at each observing station. Illustrative examples are included. A proof of optimum distribution of timing stations for drag determination is given.
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