First successful rocket-propelled RM-10 research missile for drag and heat transfer studies at transonic and supersonic speeds, making use of skin calorimeter techniques, at Wallops Island, Va. References: 17 .

Heat transfer studies

Ustinov's requirement was to deliver a 3000 kg nuclear warhead over a 3000 km range (eg to reach the United Kingdom).

Launched 15:05 local time. Reached 87.4 km. Carried Temp, composition, solar radiation (Naval Research Lab); biological experiments for Signal Corps Engineering Lab, University of Michigan.

AF flight 44. Accelerated stall check at transonic speeds. Mach 1.1 at 12200 m. References: 49 , 97 .

AF flight 45. Altitude attempt. Only 2 cylinders fired. References: 49 , 97 .

Failed in the first stage. Vehicle was supposed to obtain cosmic ray data at altitudes unattainable by other rockets. V-2 reached 50 km, 790 m/s; WAC destroyed.

AF flight 46. Partial engine malfunction, faulty engine ignition plug. References: 49 , 97 .

Upper-air pressures and temperatures; earth photography research. Engine cut-out after 55 seconds. Launched at 0914 local time. Reached 80.5 km.

Launched 08:15 local time. Reached 8.9 km. Carried Solar radiation (Naval Research Lab) experiments for General Electric.

AF flight. Engine chamber exploded, jamming rudder. Everest landed safely. References: 49 , 97 .

NACA flight 24. Check on airplane instrumentation. Mach 0.88 at 12200 m. References: 49 , 97 .

Test of separable warhead. Range achieved 200 km. Ballistic launch. Expected range 210 km. Launched at 0612 local time. The launches were first made public by Tass on March 27, 1958: 'In May 1949 a single-stage Russian rocket attained an altitude of 109 km with an instrument payload of 120 to 130 kg'. References: 283 , 344 .

Test of separable warhead. Range achieved 279.6 km. Ballistic launch. Expected range 210 km. Launched at 1857 local time. References: 283 , 344 .

Recognizing that rocket test ranges will exceed White Sands capability, Cape Canaveral selected for future long range flights. President Truman signed a bill providing a 5,000-mile guided-missile test range, which was subsequently established at Cape Canaveral, Fla. Negotiations with British government begin for installation of string of tracking stations in Bahamas Islands. References: 47 .

NACA flight 25. Spanwise pressure distribution, stability and control. Mach 0.91. References: 49 , 97 .

Test of separable warhead. Range achieved 210 km. Ballistic launch. Expected range 210 km. Launched at 0548 local time. References: 283 , 344 .

Test of separable warhead. Range achieved 320 km. Ballistic launch. Expected range 210 km. Launched at 0055 local time. References: 283 , 344 .

Test of separable warhead. Range achieved 32.9 km. Vertical launch. Expected range 22 km. Launched at 0440 local time. Carried two 85 kg Physical Measurement of Atmospheric Boundary (FIAR-1) containers, but they were not recovered. References: 283 , 344 .

NACA flight 26. Spanwise pressure distribution, stability and control. Mach 0.91. Stabilizer found more effective than the elevator during pull-ups at mach 0.91. References: 49 , 97 .

Test of separable warhead. Range achieved 31.9 km. Vertical launch. Expected range 22 km. Launched at 0450 local time. Carried two 85 kg Physical Measurement of Atmospheric Boundary (FIAR-1) containers, which were recovered but damaged; no science resulted References: 283 , 344 .

Groettrup group consulted on 'R-13' (code name for R-11?). Specifications include 1000 kg warhead, 120 km range. References: 86 .

In selecting a final R-3 design, Korolev's preferred approach was a conventional single-stage design. This was down-selected within the bureau and seems to have borrowed a lot from contemporary classified US orbital rocket designs.

Redstone Arsenal was reactivated from standby status as the site of the Ordnance Rocket Center.

The planned IRBM's (R-3 or G-4) would use a new design high pressure cylindrical combustion chamber. This would feed a spherical mixing chamber. The German engineers worked with Glushko to build a subscale 7 tonne thrust, 60 atmosphere chamber pressure test model. Given the Russian designation ED-140, this was run 100 times between the summer of 1949 and April of 1950. 19 of these chambers would feed the chamber of the Glushko RD-110 engine slated for use in Korolev's competing R-3 rocket.

After five unpowered flights, the program was cancelled. By that time better-funded turbojet-powered fighter prototypes were already achieving the 1200 km/hr top speed of the 5. Biesnovat and Isayev would elaborate the design in unmanned form into the supersonic R-1 air-to-surface missile.

Composition research. Launched at 0610 local time. Reached 78.4 km.

First use of small pulse rockets in flight as disturbing impulse for evaluation of dynamic stability in a model of the Rascal missile, at NACA's Wallops Island. References: 17 .

Solar radiation research. Launched at 1903 local time. Reached 109.5 km.

Launched 15:35 local time. Reached 133.9 km. Carried cosmic and solar radiation, temperature, pressure, ionosphere, photo experiments for Air Research and Development Command. Second V-2 flight carrying a live AF Aero Medical Laboratory monkey, Albert II. The monkey survived but died on impact.

NACA flight 27. Spanwise pressure distribution, stability and control. Rolls and pull-ups around mach 0.91. References: 49 , 97 .

Classified flight. Launched at 0450 local time. Reached 88.5 km.

Cosmic radiation, solar radiation research. Launched at 1621 local time. Reached 88.5 km.

NACA flight 28. Spanwise pressure distribution, stability and control. Rolls, pull-ups, check of stabilizer effectiveness. References: 49 , 97 .