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U.S. Space Launch Systems Chapter 9 U.S. SPACE LAUNCH SYSTEMS Space systems can be divided into two categories: the launch vehicle and the payload. The launch vehicle, commonly called the booster, propels the spacecraft and its associated payload into space. Typically for military missions, a specific payload is always flown on a specific booster. For example, the Global Positioning System (GPS) satellites are always launched on a Delta II launch vehicle. The same is true for most of our military payloads. US SPACE LAUNCH SYSTEM Challenger disaster and other launch DEVELOPMENT failures. The first Delta II was successfully launched on 14 February 1989. The Legacy Boosters Delta II 6925 carried nine GPS satellites into orbit. The Delta II model 7925, the Delta current version of this venerable launch vehicle, boosted the remainder of the Delta rockets are a family of medium original GPS constellation and is lift class vehicles by which a variety of currently used to launch the new Block satellites have been launched as part of 2R version of GPS. U.S. and international space programs. It The Delta II's first stage is 12 feet was originally designed as an interim longer than previous Deltas, bringing the launch vehicle consisting of a Thor total vehicle height to 130.6 feet. The Intermediate Range Ballistic Missile payload fairing (shroud covering the third (IRBM) first stage and Vanguard second stage and the satellite) was widened from and third stages. Continued improvements eight to 9.5 feet to hold the GPS satellite. allow the Delta to inject over 4,000 The nine solid-rocket motors (SRM) that pounds into a geosynchronous transfer ring the first stage contain a more powerful orbit (GTO). propellant mixture than previously used. The National Aeronautics and Space Delta 7925 began boosting GPS Administration (NASA) placed the satellites in November 1990. The Delta original contract with the Douglas 7925 added new solid rocket motors with Aircraft Company in April 1959. The cases made of a composite material early three-stage vehicle had a length of called graphite-epoxy. The motor cases 85.4 feet, a first stage diameter of eight built by Hercules Aerospace are lighter, feet and a lift-off weight of 113,500 but as strong as the steel cases they pounds. The modified Thor first stage replaced. The new motors are six feet had a thrust of about 170,000 pounds. longer and provide much greater thrust. On 13 May 1960, the first Delta failed to The main-engine nozzle on the first stage achieve orbit, but subsequent vehicles was also enlarged to give a greater proved to be highly reliable. expansion ratio for improved performance. Built by McDonnell Douglas (which The Delta program has had a history of merged with Boeing in August 1997), successful domestic/foreign military and The Delta II entered the Air Force commercial launches. The Delta has inventory in February 1988. The vehicle accomplished many firsts over its was developed after the Air Force lifetime: it was the first vehicle to launch decided to return to a mixed fleet of an international satellite (Telstar I in expendable launch vehicles following the 1962); the first geosynchronous orbiting AU Space primer 7/23/2003 9 - 1 satellite (Syncom II in 1963) and the first The first Atlas launches were at Cape commercial communication satellite Canaveral in 1957, but only the third (COMSAT I in 1965). launch on 2 August 1958 was a complete success, traveling about 2,500 miles Atlas downrange. The operational Atlas D was flight-tested from the Pacific Test Range The Atlas (Fig. 9-1) was produced in in California, between April and August the 1950s as the first U.S. of 1959. Improved versions, Atlas E and intercontinental ballistic missile to F, were test launched in 1960 and 1961, counter the threat posed by the Soviet respectively. Some operational missiles development of large ballistic missiles. were contained in coffin-like shelters An Atlas booster carried U.S. astronaut (Atlas E) from which they were raised to John Glenn into orbit under the first U.S. a vertical position for launch. The manned program, Project Mercury. increasing vulnerability of launch sites to Its design profited from Soviet ICBMs led to the construction of the thermonuclear break- an underground silo in which the Atlas F through of 1954, which led was fueled, serviced and elevated to the to warheads of lighter surface for launching. weight. Atlas rockets also In its role as a space launch vehicle, played a prominent role in systems are modified for specific space the U.S. space program. missions. Current Atlas II boosters, The Atlas ICBM stood provide a medium lift capability for the 82.5 feet high and had a Fleet Satellite Communications Systems diameter of 10 feet. The (FLTSATCOM) and the Defense lift-off weight was about Satellite Communications System 266,000 pounds, with a (DSCS). The booster generates range exceeding 9,000 approximately 340,000 pounds of thrust miles. at liftoff and can place payloads of up to Attached to the base of 1,750 pounds into polar orbit. Atlas the Atlas structure was a space launch vehicles were used in all gimbal-mounted Rocket- three unmanned lunar exploration dyne LR-105 engine of programs. Atlas Centaur vehicles also 57,000 lb thrust, which launched Mariner and Pioneer planetary operated together with two probes. 1,000 lb thrust swiveling The Atlas booster has been in use for motors used for roll more than 30 years and remains a key control. part of the U.S. space program. The first Two Rocketdyne LR-89 space launch on an Atlas E was in 1974 boost engines burned at and the last launch of the “E” series was takeoff with the central in March 1995. The E series had been sustainer. Each of these used to launch the military’s Defense 165,000 lb-thrust engines Meteorological Satellite Program operated for about 145 (DMSP) satellites. Fig. 9-1. seconds before separating In May 1988, the Air Force chose ATLAS I (half-stage). The central General Dynamics to develop the Atlas II Atlas engine continued to vehicle, primarily to launch DSCS burn for a total of about 270 seconds. All payloads. This series uses an improved the engines drew their liquid oxygen- Centaur upper stage, the world's first kerosene (RP-1) propellants from common high-energy propellant stage, to increase tanks in the sustainer. Guidance its payload capability. Atlas II also has depended on an inertial system that lower-cost electronics, an improved flight deflected the main engines in conjunction computer and longer propellant tanks with the two roll jets. than Atlas I, which was developed for AU Space primer 7/23/2003 9 - 2 commercial payloads due to the lull of Titan II launch activity caused by several launch failures in the late 1980s. It was used Deployed as an ICBM from 1963 until throughout the 1990's primarily for 1987, the Titan II (Fig. 9-2) is not new to commercial comsats. the space launch role. In 1965, modified Atlas II provides higher performance Titan IIs began supporting NASA's than the earlier Atlas I by using engines manned Gemini and other unmanned with greater thrust and longer fuel tanks space flights. Fifteen of the 50 existing for both stages. The total thrust Titan II ICBMs were refurbished and capability of the Atlas II of modified to support future launches. approximately 490,000 pounds enables The two-stage Titan II ICBM stood the booster to lift payloads of about 6,100 103 feet tall with a diameter of 10 feet, pounds into geo-synchronous orbit. and a lift-off weight of about 330,000 On 15 December 1993, the first Atlas pounds. Operationally, the single reentry IIAS was launched. The rocket can carry vehicle usually carried a thermonuclear 8,000 pounds to a geo-synchronous warhead of five to 10 megatons with a transfer orbit and up to 18,000 pounds to top range of 9,300 miles. The a low earth orbit. The vehicle uses four Titan II was in service Castor 4A solid strap-ons, is 156 feet tall between 1963 and 1987, with and weighs 524,789 pounds at lift off. 54 operational missiles. The Only two of the strap-ons are used at force comprised three wings launch. The other two are air-starts about of 18 missiles each stored in one minute after launch. The launch of underground silos at Davis- the Atlas IIAS completes the Mothan AFB, Arizona, development of the original Atlas family. McConnell AFB, Kansas and The division of General Dynamics that Little Rock AFB, Arkansas. builds the Atlas was acquired by Martin Each of the two first-stage Marietta in 1994. They, in turn, merged Titan II engines develops a with Lockheed in 1996 to form the thrust of 215,000 pounds. Lockheed-Martin conglomerate. The single second-stage As of mid-1999, the radically new engine develops 100,000 Atlas III was about to make its inaugural pounds of thrust. Both stages flight. Due to numerous delays stemming use storable nitrogen from a problem with the upper stage tetroxide and aerozine-50 motor, The Atlas III was finally launched propellants. An inertial on 24 May 1999, flawlessly boosting an system provides guidance Eutelsat communications satellite to commands to the engines. geosynchronous orbit. The new model The engines are gimbal- use a Russian designed RD-180 engine Fig. 9-2. mounted for thrust vector Titan II with two thrust chambers rather than the control. traditional one sustainer/two booster Modified Titan IIs launched Gemini configuration of the original Atlases.
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