The Vanguard rocket explodes shortly after launch.
|Mission type||Earth science|
|Operator||Naval Research Laboratory (NRL)|
|Launch mass||1.36 kilograms (3.0 lb)|
|Start of mission|
|Launch date||December 6, 1957, 16:44:34UTC|
|Launch site||Cape Canaveral LC-18A|
Vanguard TV3 was the first attempt of the United States to launch a satellite into orbit around the Earth. It was a small satellite designed to test the launch capabilities of the three-stage Vanguard and study the effects of the environment on a satellite and its systems in Earth orbit. It was also to be used to obtain geodetic measurements through orbit analysis.
At its launch attempt on December 6, 1957 at Cape Canaveral, the booster ignited and began to rise; but about two seconds after liftoff, after rising about four feet (1.2 m), the rocket lost thrust and began to fall back to the launch pad. As it settled the fuel tanks ruptured and exploded, destroying the rocket and severely damaging the launch pad. The Vanguard satellite was thrown clear and landed on the ground a short distance away with its transmitters still sending out a beacon signal. The satellite was damaged, however, and could not be reused. It is now on display at the National Air and Space Museum of the Smithsonian Institution.
The exact cause of the accident was never determined with certainty, but the commonly accepted explanation is that low fuel tank pressure during the start procedure allowed some of the burning fuel in the combustion chamber to leak into the fuel system through the injector head before full propellant pressure was obtained from the turbopump.
Satellite construction project
The history of the Vanguard TV3 project dates back to the International Geophysical Year (IGY). Initiated in 1952, orbiting a satellite became one of the main goals of the IGY. This was an enthusiastic international undertaking that united scientists globally to conduct planet-wide geophysical studies. The IGY guaranteed free exchange of information acquired through scientific observation which led to many important discoveries in the future. As early as July 1955, President Dwight D. Eisenhower announced, through his press secretary, that the United States would launch “small, unmanned, earth-circling satellites as part of the U.S. participation in the I.G.Y.”  On September 9, 1955, the United States Department of Defense wrote a letter to the secretary of the Navy authorizing the mission to proceed. The US Navy had been assigned the task of launching Vanguard satellites as part of the program. Project Vanguard had officially begun.
|This section does not cite any references or sources. (December 2012)|
The payload was a 1.36 kg aluminium sphere 152 mm in diameter, nearly identical to the later Vanguard 1. It contained a mercury battery powered, 10 mW, 108 MHz transmitter and a 5 mW, 108.03 MHz transmitter powered by six solar cells mounted on the body of the satellite. Six short antennas protruded from the sphere. The transmitters were used primarily for engineering and tracking data, but were also used to determine the total electron content between the satellite and ground stations. Vanguard also carried two thermistors to measure the interior temperatures in order to track the effectiveness of the thermal protection.
Engineers recovered the payload from the launch area, still functioning. It was restored and put on display at the entrance to the Apollo gallery when the National Air and Space Museum opened in 1976. Since then the display has been modified to show TV3 in a condition closer to what it was found in.
Launch vehicle design
The Vanguard TV3 utilized a three-stage launch vehicle known as the Vanguard designed to send the satellite into orbit around the earth. The fins were removed from the rocket as a way to reduce the drag, but instead, a big motor is mounted in gimbals which allow it to pivot and direct its thrust for steering. The same feature is similarly rigged for the second and third stages of the rocket as well.
The first stage allows the rocket to rise vertically under the powerful thrust of exploding liquid oxygen, ethyl alcohol, gasoline and silicone oil which propels the vehicle at a rate of 4000 miles per hour, lifting the satellite through the denser layers of the atmosphere in 130 seconds. At this point, the second stage burns its fuel carrying it away from the stage one motor and tanks. The satellite rises to an altitude of 300 miles above the earth. The flight path has been programed to change from a vertical into a more horizontal course. Then, the third stage takes over to provide spin and the final boost, shoving stage three horizontally into orbit at the rate of 18000 miles per hour. The satellite slowly disengaged from the third-stage rocket where at this speed, the satellite falls toward earth at the same rate earth’s surface curves away from it. As a result, the satellite’s distance from the earth remains about the same.
Newspapers in the United States, published prominent headlines and articles noting the failure including plays on the name of the Russian satellite, Sputnik, such as "Flopnik", "Kaputnik", "Oopsnik", and "Stayputnik".
Later analysis of this technological failure characterized this as a humiliation and loss of prestige for the United States which had presented itself to the world as the leader in science and technology. Its rival in the Cold War, the Soviet Union exploited this at the time. The American’s failed attempt of launching a satellite was an international embarrassment on their part for wanting to publicly show in front of media through television and newspaper cameras from around the world. The amount of research and development to create the Vanguard TV3 was destroyed in a matter of seconds. A few days after the incident, a Soviet delegate to the United Nations inquired solicitously whether the United States was interested in receiving aid earmarked for "undeveloped countries”. The Soviets were quick to mock their rivals in the space race for not being as technologically advanced as they were.
- YouTube - Vanguard (Flopnik) (in black and white)
- YouTube - Vanguard TV3 Failed Rocket Launch (in color)
- Google Newspapers - The Ottawa Citizen - "US fails to fire Satellite"
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