Monday, May 2, 2011
"HIBEX (High Booster Experiment) was a 2-year research project to investigate the technology of a very high acceleration, short range anti-ballistic missile interceptor, for hard point: defense. The HIBEX missile achieved nearly 400 g peak axiai and over 60 g lateral acceleration, reaching a velocity of nearly Ma = 8, in a little over 1-sec burn time, with pitch over from a vertical ejection from a silo to a trajectory of 15 deg elevation. In 2 more years, UPSTAGE, a maneuvering HIBEX second stage, demonstrated over 300 g lateral acceleration and a side-force specific impulse Isp > 1000 sec using external burning, jet flow control techniques and a laser gyro for guidance. The HIBEX technology furnished the basis for the Army's LoADS short range interceptor program. UPSTAGE jet maneuvering control technology has been incorporated into the SDI's HEDI missile."
Yep, that is mach 8 in 1 second.
Hibex at Alternatewars.com
Various other topics here.
"As in the case of the Sprint first stage, the principal means of control in
HIBEX was the injection of Freon gas into the exhaust of the booster.
However, in later flights, experiments with other control techniques were performed. The TVC system of HIBEX consisted of four valves spaced at 90 degrees around the nozzle of the motor; each valve was capable of injecting a total of 194 pounds of Freon per second at 1,400 psi. Each valve fed three nozzles. HIBEX carried a maximum of 98 pounds of Freon, but only 78 pounds were usable. The Freon was fed by means of a blow-down system that used compressed nitrogen as its source of pressure. This system was designed to provide 2.5 degrees maximum thrust vector deflection which amounted to 2.5 percent of motor impulse with a maximum response time of 20 milliseconds. This thrust was the equivalent to a “side force” of 15,000 pounds in less than 0.05 second."
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