USAF X-17 flight test program at Cape Canaveral studied reentry problems by simulating reentry velocities and conditions with a three-stage solid-fuel Lockheed X-17. A total of 26 X-17 flights were conducted until March 1957.
Personnel of NACA Langley and Ames Aeronautical Laboratories were engaged in research on aerodynamic characteristics of reentry configurations. Knowledge acquired from these efforts along with those of industry and the military services was used in Project Mercury, proved the ablation theory for the Army's Jupiter missile development program, and was used in the Air Force intercontinental ballistic missile nose cone reentry program.
USAF X-17 flight test program started at Cape Canaveral to study reentry problems by simulating reentry velocities and conditions with three-stage solid-fuel Lockheed X-17. A total of 26 X-17 flights were conducted until March 1957.
A five-stage, solid-fuel rocket test vehicle, the world's first, was launched to a speed of mach 15 from Wallops Island, Va. by the NACA Langley Aeronautical Laboratory's Pilotless Aircraft Research Division.
The Argus series were the only clandestine nuclear tests ever conducted by the United States. The rocket-launched nuclear warheads were set off at very high altitudes over the South Atlantic, 1800 km south-west of Capetown, South Africa. The purpose was to determine the effects of nuclear explosions on the Earth's magnetic field and the impact to military radar, communications, satellites and ballistic missiles electronics. The earth's magnetic field is not only off-axis from the earth, but also off centre from the earth's core. This means the Van Allen Radiation belts are closest to the earth in the region known as the 'South Atlantic Anomaly'. This made the selected launch point the ideal place for launching a rocket into the lower belt where the particles and radiation from the explosion would be trapped.
The 1.7 kiloton W-25 warhead used had been developed and previously tested for the Genie air-to-air missile. The first test was launched from 38.5 deg S, 11.5 deg. W, and exploded at an altitude of 160 km. The initial flash was followed by an auroral luminescence extending upward and downward along the magnetic lines where the burst occurred. The experiment verified the predicitons made in the original October 1957 proposal by N. C. Christofilos of the Lawrence Radiation Laboratory in Livermore.
Second covert Argus launch to study effect of nuclear explosions on the Van Allen radiation belts. The launch location was 49.5 deg South, 8.2 deg West; altitude reached 294 km; yield of the nuclear warhead, 1.7 kilotons.
Third and final covert Argus launch to study effect of nuclear explosions on the Van Allen radiation belts. The launch location was 48.5 deg South, 9.7 deg West ; altitude reached 750 km; yield of the nuclear warhead, 1.7 kilotons.
Deputy Secretary of Defense Quarles announced that three atomic blasts were secretly fired in space (Project Argus) in 1958, using modified X-17 rockets.