No coin nor oath required. For personal study only.
632 Miles-per-Hour Sled Run.--An Air Force officer has gone from a speed of 632 miles per hour to a dead stop in less than one and a half seconds in performance of a test for the Air Research and Development Command. Lt. Colonel John P. Stapp, Chief of the Aero-Medical Field Laboratory at Holloman Air Development Center, New Mexico, reached that speed while riding a rocket-propelled sled to reproduce exposure to windblast and slowdown effects experienced by aircrewmen when escaping from aircraft at supersonic speeds.
The test vehicle was a 2000-lb. sled mounted on rails and pushed by nine rockets which exerted a total force of 40,000 lb. thrust. The enormous force generated by the rockets accelerated the sled from a standing start to its top speed of 632 miles per hour in five seconds time and 2800-ft. distance. After the rockets burned out, the sled coasted for less than a half second and the actual braking to a stop took a fraction more than a second. During the test the subject, Colonel Stapp, withstood a deceleration of 35 times gravity and a wind pressure of more than two tons. With the exception of a plastic helmet and a clear plastic visor to protect his face, no special clothing was worn for the test.
The sled was stripped even of a wind shield for the test. The subject was strapped to his seat with a special nylon web harness made of individual strips of nylon comprising shoulder and leg straps, chest and lap belt and tie down straps.
At the 4100-ft. altitude of Holloman Air Development Center, the wind force against Colonel Stapp's body when he reached the speed of 632 miles per hour was equivalent to that of almost 1.7 times the speed of sound (more than 1000 miles per hour) at
๐ SIMILAR VOLUMES
## Abstract In this letter, the miniaturized bandstop filter with lumped capacitor element is presented. The resonator is based on a stopband characteristic of Uโshaped defected ground structure (DGS) section. Lumped capacitor element is embedded into DGS section without altering the geometry. The
This study focuses on testing the effects of one and several reflow processes on surface mount tantalum capacitor characteristics, especially in a humid environment. Effects on maximum voltage, moisture absorption, and durability in the standard 85/85 test were examined. Research was done by using a
## Abstract A novel miniaturized microstrip Wilkinson power divider with capacitor loading is presented in this article. The new divider not only effectively reduces the occupied area to 45% of the conventional one at 1.0 GHz, but also has good harmonic suppression performance. Furthermore, the new