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[[image]] National Aeronautics and Space Administration Space Shuttle Endeavour Lifts Off Into Space The Space Shuttle Endeavour lifts off on mission STS-54 from the NASA Kennedy Space Center in Florida. Endeavour is one of NASA's four reusable launch vehicles used to carry payloads and crewmembers into space to conduct experiments in a microgravity environment. The Space Shuttle system consists of four parts: the orbiter, external tank, and two solid rocket boosters. In the launch configuration, the orbiter and two solid rocket boosters (SRB) attach to the external tank (ET) in a vertical or nose-up position on the launch pad. Four bolts attach each of the SRB's to the platform. The silo-like brown external tank contains the propellants for the three main engines on the orbiter. At launch, the Space Shuttle's main engines ignite first at T minus 6 seconds. When computers verify the engines are operating at the proper thrust level, they send a signal to ignite the SRB. At T minus 0 seconds, the holddown explosive bolts blow and the Space Shuttle lifts off the launch pad. Little more than 2 minutes into the flight, the SRB's, their fuel expended, jettison. The boosters briefly continue to ascend, while small motors fire to push them away from the Space Shuttle. The boosters turn and begin to descend. Parachutes deploy to decelerate them for a safe splashdown in the Atlantic Ocean. Two ships recover the boosters and return them to a processing facility for refurbishment and eventual reuse. Meanwhile, the orbiter and external tank continue to ascend, using the thrust of the three main engines. Approximately eight minutes after launch, the three Space Shuttle engines shut down and the external tank jettisons from the orbiter. The external tank continues on a ballistic trajectory and enters the atmosphere where it disintegrates. After main engine cut-off, the orbiter and the external tank move along a trajectory that, if not corrected, would result in the vehicle entering the atmosphere about halfway around the world from the launch site. However, a brief firing of the orbiter's two Orbital Maneuvering System (OMS) thrusters changes the trajectory and orbit is achieved. The OMS engines are also used on orbit for any velocity changes and reentry. Electronic Resources Additional information is available over the World Wide Web at the following address: http://www.osf.hq.nasa.gov/heds Facts and Figures Orbiter Wing Span 23.79 meters Length 37.24 meters Height 17.27 meters Payload Bay 18.3 meters x 4.6 meters Payload Weight (launch max.) 24,948 kilograms (approx.) Main Engine (each) Thrust at 100% throttle setting: Sea Level 1,670 kilonewtons Vacuum 2,100 kilonewtons External Tank (ET) Length 47 meters Diameter 8.4 meters Gross Weight (full) 750,980 kilograms Solid Rocket Booster (SRB, each) Length 45.46 meters Diameter 3.7 meters Thrust at Lift-off 14,685 kilonewtons Gross Weight (approx.) 589,670 kilograms Operations Gross Lift-off Weight(approx.) 2,041,200 kilograms Total thrust at launch 33,327 kilonewtons SRB separation altitude 50 kilometers SRB splashdown distance from KSC 260 kilometers ET separation altitude (approx.) 120 kilometers Orbital velocity (approx.) 27,869 kilometers/hour Space Shuttle Launch to Orbit Profile [[series of images of a space shuttle]] Liftoff SRB separation at 50 km ET separation at 120 km OMS engines fire Orbiter operational at 185-402 km SRB splashdown at 260 km from the NASA Kennedy Space Center HqL-432 7/96
