Orbital Space Plane Program

This article is about the specific NASA project. For the general topic, see spaceplane. For various programmes, see list of spaceplanes.

The Orbital Space Plane (OSP) program was a NASA spaceplane concept in the early 2000s designed to support the International Space Station requirements for crew rescue, crew transport and contingency cargo transport. It was part of the Space Launch Initiative.

Conceptual drawings of the Orbital Space Plane

When NASA began the Constellation program in 2004, NASA transferred the knowledge gained on the OSP to the development of the Crew Exploration Vehicle.^[1]

Origin

A small, low-cost 'Assured Crew Return Vehicle' (ACRV) had been envisaged for the International Space Station, serving as an emergency evacuation capability. The X-38 was the prototype.^[2] This evolved into the Orbital Space Plane concept: rather than being only a lifeboat, the OSP would serve as a crew transport vehicle to and from the ISS. This had been expected to enter service by 2010.^[3]

The Space Launch Initiative program began with the award of reusable launch vehicle study contracts in 2000.^[4] In November 2002 it was evolved into the Orbital Space Plane Program and the Next Generation Launch Technology Program.^[5]

Function

Future versions of the Orbital Space Plane would have been launched on an existing Evolved Expendable Launch Vehicle (EELV) rocket to carry crews to the International Space Station. It was envisaged that the OSP would operate alongside the Space Shuttle with the OSP responsible for crew flights and the shuttle handling construction and cargo flights. At the time, the shuttle program was not yet set for retirement and was thought to be technically viable up until the 2030s. Thus it was expected that the two spacecraft would complement each other throughout the lifespan of the ISS. One advantage of this approach would have been assured human access to space; the lack of this capability was to be highlighted starkly with the loss of Space Shuttle Columbia.^{[citation needed]}

Top level requirements for the Orbital Space Plane and its related systems were approved in February 2003.^[6] In March 2003, the program began evaluating system operations to ensure the alignment of systems design between the NASA mission and the contractor design.^{[citation needed]}

Transfer to the CEV program

The Crew Exploration Vehicle program was based on four groups of concepts considered for the physical design of the space plane itself — or the vehicle architecture: a capsule, a lifting body, a sharp body with wings and a blunt body with wings.^{[citation needed]}

After the Columbia accident investigation, the capsule design with a separate escape system was considered the optimal design for crew safety.^{[citation needed][when?]}

Other program components

Other components of the OSP program were the X-37 and the DART.^[7]

The X-37 vehicle was designed to flight test advancing technologies to reduce the risk of future reusable launch vehicle systems, including the Orbital Space Plane.^{[citation needed]}

The Demonstration for Autonomous Rendezvous Technology or DART, was another flight demonstrator vehicle designed to test technologies required to locate and rendezvous with other spacecraft. Using onboard guidance sensors, DART would have performed a series of maneuvers around a retired satellite. However, after a successful launch, unknown problems with the guidance system caused the vehicle to run out of thruster fuel prematurely, ending the mission before all objectives could be carried out.^{[citation needed]}

In 2010, Orbital Sciences Corporation reused some work done under OSP program contracts for its Prometheus spacecraft proposal to NASA under phase 2 of the Commercial Crew Development program.^[8]

See also

• Hermes
• Dream Chaser

References

1. "VA-HUD and Independent Agencies Subcommittee Hearing of FY05 Budget Request for NASA: Testimony of Sean O'Keefe, Administrator, NASA". Hearings & Testimony. U.S. Senate Committee on Appropriations. 2004-03-11. Archived from the original on 2006-12-27. Retrieved 2007-01-29.
2. Lindroos, Marcus. "NASA ACRV". Encyclopedia Astronautica. Archived from the original on 2006-12-10. Retrieved 2011-03-18.
3. Bray, Becky; Meyer, Patrick (2003-06-17). "Orbital Space Plane--Commuting To Space". Liftoff to Space Exploration. Marshall Space Flight Center. Archived from the original on 2006-12-11. Retrieved 2007-01-29.
4. "Space Launch Initiative fact sheet". NASA. April 2002.
5. "NASA's Space Launch Initiative: The Next Generation Launch Technology Program" (PDF). NASA. May 2003. Retrieved November 29, 2022.
6. "Beginning a New Era of Space Flight: The Orbital Space Plane". Marshall Space Flight Center. May 2003. Retrieved 2007-01-29.
7. Orbital Space Plane (OSP) Program at Lockheed Martin (Sept. 2003)
8. "Orbital Submits Proposal for NASA's Commercial Crew Development Program". Press Release. Orbital Sciences Corporation. 2010-12-14. Retrieved 2011-03-08.