FREE-FIELD PRESSURES, STATION ZERO
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
Free-field pressures as a function of time were measured at eight positions above the Wigwam weapon at distances from the charge varying from 800 to 1975 ft. Tourmaline PE gauges were used. Signals were either telemetered to a remote receiving location or were recorded in place on a magnetic-tape recorder that was recovered after the shot. The variation of maximum observed pressure in pounds per square inch with distance in feet from the weapon in this range is given by the expression Pmax 2.03 x 10 to the 7th powerR to the 1.16th power. Impulse, at locations not affected by surface cutoff, is given by the expression I 3.36 x 10,000R to the .77th power where I is in pound seconds per square inch. Energy flux density, at locations not affected by surface cutoff, is given by the expression E 3.81 x 10 to the 10th powerR to the 1.87th power where E is in inch pounds per square inch. The fiducial pulse was recorded at 12.5 1 msec be fore weapon detonation. The shock wave arrived at the water surface 385.5 msec after the fiducial pulse. The equivalent weight of TNT required to produce the same peak pressures as the Wigwam weapon at 2000 ft was 4.05 x 10 to the 7th power lb.
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