Accession Number:

AD0621563

Title:

THE ACCURACY OF DRAG MEASUREMENTS AS A FUNCTION OF NUMBER AND DISTRIBUTION OF TIMING STATIONS

Descriptive Note:

Corporate Author:

ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s):

Report Date:

1948-02-01

Pagination or Media Count:

23.0

Abstract:

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.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Ballistics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE