Space Shuttle Enterprise: Wikis

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Enterprise
OV-101
Space Shuttle Enterprise
Enterprise at SLC-6 at Vandenberg AFB
OV designation OV-101
Country United States
Contract award July 26, 1972
Named after USS Enterprise (NCC-1701)
Status On display at Smithsonian Institution, Steven F. Udvar-Hazy Center[1]
First flight Taxi test
February 15, 1977
Last flight Free flight
October 26, 1977
Time spent in space Never flew in space

The Space Shuttle Enterprise (NASA Orbiter Vehicle Designation: OV-101) was the first Space Shuttle orbiter. It was built for NASA as part of the Space Shuttle program to perform test flights in the atmosphere.[2] It was constructed without engines or a functional heat shield, and was therefore not capable of spaceflight.

Originally, Enterprise had been intended to be refitted for orbital flight, which would have made it the second space shuttle to fly after Columbia.[2] However, during the construction of Columbia, details of the final design changed, particularly with regard to the weight of the fuselage and wings. Refitting Enterprise for spaceflight would have involved dismantling the orbiter and returning the sections to subcontractors across the country. As this was an expensive proposition, it was determined to be less costly to build Challenger around a body frame (STA-099) that had been created as a test article.[2] Similarly, Enterprise was considered for refit to replace Challenger after the latter was destroyed, but Endeavour was built from structural spares instead.[2][3]

Contents

Service

Construction began on the first orbiter on June 4, 1974.[2] Designated OV-101, it was originally planned to be named Constitution. However, a write-in campaign caused it to be renamed after the Starship Enterprise, featured on the television show Star Trek.[3]

The design of OV-101 was not the same as that planned for OV-102, the first flight model; the tail was constructed differently, and it did not have the interfaces to mount OMS pods. A large number of subsystems - ranging from main engines to radar equipment - were not installed on this vehicle, but the capacity to add them in the future was retained. Instead of a Thermal Protection System, its surface was primarily fiberglass.

In mid-1976, the orbiter was used for ground vibration tests, allowing engineers to compare data from an actual flight vehicle with theoretical models.[2]

On September 17, 1976, Enterprise was rolled out of Rockwell's plant at Palmdale, California. In recognition of its fictional namesake, Star Trek creator Gene Roddenberry and most of the cast of the original series of Star Trek were on hand at the dedication ceremony.[4]

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Approach and landing tests (ALT)

Enterprise as it banks on its second Approach and Landing Test, September 13, 1977

On January 31, 1977, it was taken by road to Dryden Flight Research Center at Edwards Air Force Base, to begin operational testing.[2][5]

While at NASA Dryden, Enterprise was used by NASA for a variety of ground and flight tests intended to validate aspects of the shuttle program.[6] The initial nine-month testing period was referred to by the acronym ALT, for "Approach and Landing Test".[2][7]These tests included a maiden "flight" on February 18, 1977 atop a Boeing 747 Shuttle Carrier Aircraft (SCA) to measure structural loads and ground handling and braking characteristics of the mated system. Ground tests of all orbiter subsystems were carried out to verify functionality prior to atmospheric flight.

The mated Enterprise/SCA combination was then subjected to five test flights with Enterprise unmanned and unactivated. The purpose of these test flights was to measure the flight characteristics of the mated combination. These tests were followed with three test flights with Enterprise manned to test the shuttle flight control systems.[2]

Finally, Enterprise underwent five free flights where the craft separated from the SCA and was landed under astronaut control. These tests verified the flight characteristics of the orbiter design and were carried out under several aerodynamic and weight configurations.[7]

Preparation for STS-1

Enterprise visited pad 39-A in launch configuration 20 months before the first Shuttle launch.[8]

Following the ALT program, Enterprise was ferried among several NASA facilities to configure the craft for vibration testing. In June 1979, it was mated with an external tank and solid rocket boosters (known as a boilerplate configuration) and tested in a launch configuration at Kennedy Space Center Launch Pad 39A.[3]

Retirement

With the completion of critical testing, Enterprise was partially disassembled to allow certain components to be reused in other shuttles, then underwent an international tour visiting France, Germany, Italy, the United Kingdom, Canada, and the U.S. states of California, Alabama, and Louisiana (during the 1984 Louisiana World Exposition). It was also used to fit-check the never-used shuttle launch pad, SLC-6 at Vandenberg AFB, California. Finally, on November 18, 1985, Enterprise was ferried to Washington, D.C., where it became property of the Smithsonian Institution.[3]

Post-Challenger

After the Challenger disaster, NASA had a choice of which shuttle to use as a replacement. Refitting Enterprise with all of the necessary equipment needed for it to be used in space was considered, but instead it was decided to use spares constructed at the same time as Discovery and Atlantis to build Endeavour.[3]

Post-Columbia

In 2003, after the breakup of Columbia during re-entry, the Columbia Accident Investigation Board conducted tests at Southwest Research Institute, which used an air gun to shoot foam blocks of similar size, mass and speed to that which struck Columbia at a test structure which mechanically replicated the orbiter wing leading edge. They removed a fiberglass panel from Enterprise's wing to perform analysis of the material and attached it to the test structure, then shot a foam block at it.[9] While the panel was not broken as a result of the test, the impact was enough to permanently deform a seal. As the Reinforced Carbon-Carbon (RCC) panel on Columbia was 2.5 times weaker, this suggested that the RCC leading edge would have been shattered. Additional tests on the fiberglass were canceled in order not to risk damaging the test apparatus, and a panel from Discovery was tested to determine the effects of the foam on a similarly-aged RCC leading edge. (Many tests with various RCC panels struck by foam along various trajectories were done with the same experimental setup; only the particular tests with the most notable outcomes are mentioned in this article.) On July 7, 2003 a foam impact test created a hole 41 cm by 42.5 cm (16.1 inches by 16.7 inches) in the protective RCC panel. The tests clearly demonstrated that a foam impact of the type Columbia sustained could seriously breach the protective RCC panels on the wing leading edge.

Enterprise on display with IRBMs, ICBMs, and ABM equipment at the Steven F. Udvar-Hazy Center.

The board determined that the probable cause of the accident was that the foam impact caused a breach of a Reinforced Carbon-Carbon panel along the leading edge of Columbia's left wing, allowing hot gases generated during re-entry to enter the wing and cause structural collapse. This caused Columbia to spin out of control, breaking up with the loss of the entire crew.

Museum exhibit

Enterprise was stored at the Smithsonian's hangar at Washington Dulles International Airport before it was restored and moved to the newly built Smithsonian's National Air and Space Museum's Steven F. Udvar-Hazy Center at Dulles International Airport, where it is the centerpiece of the space collection.[1] Space Shuttle Discovery is expected to be added to the collection once the Shuttle fleet is retired. When that happens, Enterprise will be likely be loaned out to other institutions.[10] Engineers evaluated the vehicle in early 2010 and determined that it was safe to fly on the Shuttle Carrier Aircraft again.[11]

Gallery

See also

References

  1. ^ a b NASA (2000). "Shuttle Enterprise at Center of Museum's Space Hangar". NASA. http://www.nasa.gov/vision/earth/everydaylife/nasm_enterprise.html. Retrieved November 28 2007. 
  2. ^ a b c d e f g h i Jenkins, Dennis R. (2007). Space Shuttle: The History of the National Space Transportation System. Voyageur Press. pp. 524 pages. ISBN 0963397451. 
  3. ^ a b c d e NASA (2000). "Enterprise (OV-101)". National Aeronautics and Space Administration. http://www-pao.ksc.nasa.gov/kscpao/shuttle/resources/orbiters/enterprise.html. Retrieved November 28 2007. 
  4. ^ Terry Lee Rioux (2005). From Sawdust to Stardust: The Biography of DeForest Kelley, Star Trek's Dr. McCoy. Simon and Schuster. p. 221. 
  5. ^ NASA (2005). "Space Shuttle Basics". NASA. http://spaceflight.nasa.gov/shuttle/reference/basics/. Retrieved November 28 2007. 
  6. ^ NASA (2002). "Space Shuttle Approach and Landing Tests (ALT)". NASA. http://www.dfrc.nasa.gov/Gallery/Photo/ALT/HTML/. Retrieved November 28 2007. 
  7. ^ a b NASA - Dryden Flight Research Center (1977). "Shuttle Enterprise Free Flight". NASA. http://grin.hq.nasa.gov/ABSTRACTS/GPN-2000-000218.html. Retrieved November 28 2007. 
  8. ^ NASA (1979). "Shuttle Orbiter Enterprise on Launch Complex 39". NASA. http://images.ksc.nasa.gov/photos/1979/captions/KSC-79PC-0274.html. Retrieved January 21 2008. 
  9. ^ Harwood, William (June 4, 2003). "Critical foam impact test planned for Thursday". Spaceflight Now. http://spaceflightnow.com/shuttle/sts107/030604foamtest/. Retrieved 2007-07-12. 
  10. ^ Berger, Eric (December 7, 2009). "Counting down to who will land a retired shuttle". Houston Chronicle. http://www.chron.com/disp/story.mpl/nation/6756689.html. Retrieved March 16, 2010. 
  11. ^ Bergin, Chris (March 14, 2010). "Enterprise in good condition for potential SCA ferry from Smithsonian NASM". NASAspaceflight.com. http://www.nasaspaceflight.com/2010/03/enterprise-good-condition-potential-sca-ferry-smithsonian/. Retrieved March 16, 2010. 

External links

Spacecraft named Enterprise
NASA Space Shuttle (1976–1985)Virgin Space Ship (2009—)Star Trek starships (Fictional)

Simple English


The Space Shuttle Enterprise (OV-101) is a spacecraft used by NASA for testing of the space shuttles. Enterprise was built without engines and without the heat protection system needed for it to travel into space and return to the atmosphere.[1] Enterprise began being built in June 4, 1974, and was completed on September 17, 1976.[2] Enterprise was used for flight tests in 1977.[3] Scientists wanted to test how the shuttle could be transported on top of a Boeing 747. They also did three test manned test flights with the shuttle still joined to the Boeing. When these test were finished they did another five tests with the shuttle flying without engines like a glider.[2] The pilots practiced landing the shuttle at the Edwards Airforce Base. The pilots were astronaut Gordon Fullerton, Apollo 13 astronaut Fred Haise, Joe Engle and Dick Truly.[2] After the test flights, the Enterprise was used for vibration tests at NASA's Marshall Space Flight Center in Huntsville, Alabama. After all the tests were finished, some parts of the Enterprise were used in the building of the the other shuttles.[4]

The Enterprise was going to be named the "Constitution", but many people wrote to the President and asked for it to be named after the space craft on the TV show Star Trek.[3] Enterprise can be seen today by visitors to the Smithsonian's National Air and Space Museum's Steven F. Udvar-Hazy Center near Washington, D.C.[3]

References


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