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The Mercury-Redstone Launch Vehicle, designed for NASA's Project Mercury, was the first American crewed space booster. It was used for six sub-orbital Mercury flights from 1960–1961; culminating with the launch of the first, and 11 weeks later, the second American (and the second and third humans) in space.
Project Mercury was the first human spaceflight program of the United States, running from 1958 through 1963. An early highlight of the Space Race, its goal was to put a man into Earth orbit and return him safely, ideally before the Soviet Union.
The Little Joe 1B was a launch escape system test of the Mercury spacecraft, conducted as part of the U.S. Mercury program. The mission also carried a female rhesus monkey (Macaca mulatta) named Miss Sam in the Mercury spacecraft. The mission was launched January 21, 1960, from Wallops Island, Virginia.
Mercury-Redstone 1 (MR-1) was the first Mercury-Redstone uncrewed flight test in Project Mercury and the first attempt to launch a Mercury spacecraft with the Mercury-Redstone Launch Vehicle. Intended to be an uncrewed sub-orbital spaceflight , it was launched on November 21, 1960 from Cape Canaveral Air Force Station , Florida .
It was the fourth Mercury flight launched with the Mercury-Redstone Launch Vehicle, [Note 1] from Cape Canaveral, Florida, close to the Atlantic Ocean. During the flight, Shepard observed the Earth and tested the capsule's attitude control system , turning the capsule around to face its blunt heat shield forward for atmospheric re-entry.
Mercury-Atlas 6 (MA-6) was the first crewed American orbital spaceflight, which took place on February 20, 1962. [4] Piloted by astronaut John Glenn and operated by NASA as part of Project Mercury, it was the fifth human spaceflight, preceded by Soviet orbital flights Vostok 1 and 2 and American sub-orbital flights Mercury-Redstone 3 and 4.
Mercury-Redstone 2 (MR-2) was the test flight of the Mercury-Redstone Launch Vehicle just prior to the first crewed American space mission in Project Mercury. Carrying a chimpanzee named Ham on a suborbital flight, Mercury spacecraft Number 5 was launched at 16:55 UTC on January 31, 1961, from LC-5 at Cape Canaveral , Florida .
Before the Mercury-Redstone 4 mission, Lewis Research Center and Space Task Group engineers had determined that firing the posigrade rockets into the booster-spacecraft adapter, rather than in the open, developed 78 percent greater thrust. This achieved a greater spacecraft-booster separation through a kind of "pop-gun" effect.