Saturn I SA-2

Template:Short description Template:Infobox spaceflight

Saturn-Apollo 2 (SA-2) was the second flight of the Saturn I launch vehicle, the first flight of Project Highwater, and was part of the American Apollo program. The rocket was launched on April 25, 1962, from Cape Canaveral, Florida.

HistoryEdit

Launch preparation for the mission began at Cape Canaveral on February 27, 1962, with the arrival of the second Saturn I launch vehicle. The only significant change made to the vehicle from the previous SA-1 flight was the addition of extra baffles in the propellant tanks to mitigate fuel sloshing. While no serious delays were encountered, there were several minor problems reported.<ref name="Benson1978" />

A leak was detected between the liquid oxygen dome and injector for the #4 H-1 rocket engine; while attempts were made to fix the problem, it was eventually decided to launch without replacing the engine. Minor problems were found in the guidance subsystem and service structure operations, damaged strain gauges were found in a liquid oxygen stud and truss member, and a manhole cover on the dummy Centaur (S-V-D) third stage had to be replaced. Problems arose with two of the fueling computers, but each was repaired. Three hydraulic systems were also listed as potential problems.<ref name="Benson1978" />

Despite the issues encountered during flight preparation, none required the target launch date of April 25 to be pushed back.<ref name="Benson1978" />

FlightEdit

File:Saturn SA2 launch.jpg

Launch of SA-2

Saturn-Apollo 2 was launched at 14:00:34 UTC on April 25, 1962, from Launch Complex 34.<ref name="Ryba2009" /> The only hold in the countdown sequence was for 30 minutes due to a vessel which entered the flight safety zone Template:Convert down range.<ref name="Benson1978" /><ref name="Brooks1979" /> The rocket carried Template:Convert of propellant, about 83% of its maximum capacity.<ref name="Benson1978" />

The H-1 engines shut down at an altitude of Template:Convert after firing for 1 minute 55 seconds and reaching a maximum velocity of Template:Convert.<ref name="nashua19620425" /><ref name="Ertel1969" /> The vehicle continued to coast to an altitude of Template:Convert,<ref name="Woodbridge1965" /> at which point, 2 minutes 40 seconds after launch,<ref name="nashua19620425" /> officials sent a terminate command to the rocket, setting off several charges which caused the vehicle to destruct.<ref name="Benson1978" />

ObjectivesEdit

The objectives of SA-2 were much the same as those of SA-1 in that it was primarily a test of the Saturn I rocket and the new H-1 engines. Specifically, its goals were to prove propulsion performance and mission adequacy, vehicle structural design and aerodynamic characteristics, guidance and control systems, and launch facility and ground support equipment. NASA declared all objectives as successful. Additionally, the fuel sloshing issue from SA-1 was minimized.<ref name="Brooks1979" />

A second objective of both this mission and SA-3 was Project Highwater, the intentional release of ballast water from the second and third stages which allowed scientists to investigate the nature of Earth's ionosphere, as well as noctilucent clouds and the behavior of ice in space.<ref name="Woodbridge1965" />

SA-2's dummy upper stages contained approximately Template:Convert of water,<ref name="Woodbridge1965" /> or Template:Convert,<ref name="Brooks1979" /> used to simulate the mass of future payloads. Stage two contained Template:Convert of water, and stage three contained Template:Convert.<ref name="Woodbridge1965" /> When the terminate command was sent to the rocket, dynamite charges<ref name="nashua19620425" /> split the second stage longitudinally, instantly releasing its water load.<ref name="Woodbridge1965" /> Primacord charges created several Template:Convert holes in the third stage, releasing its water over a period of several seconds.<ref name="Woodbridge1965" />

Cameras on the ground immediately recorded the water cloud, and personnel at a ground station began to observe it about four to five seconds after release.<ref name="Ryba2009" /><ref name="Woodbridge1965" /> Those personnel reported that the cloud dispersed from vision within an average of five seconds,<ref name="Woodbridge1965" /> while more sensitive instruments tracked the cloud to a maximum altitude of Template:Convert.<ref name="Benson1978" /> The cloud produced lightning-like effects, which Dr. Wernher von Braun described as "probably the first synthetic thunderstorm ever generated in space."<ref name="ap19620426" /> Project Highwater on this flight was also declared a success.<ref name="Ertel1969" />

ReferencesEdit

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External linksEdit

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