Air launch

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A Boeing X-43 being air launched from under the wing of a B-52 Stratofortress. B-52B with X43.jpg
A Boeing X-43 being air launched from under the wing of a B-52 Stratofortress.

Air launching is the practice of releasing a rocket, missile, parasite aircraft or other aircraft payload from a mother ship or launch aircraft. [1] The payload craft or missile is often tucked under the wing of the larger mother ship and then "dropped" while in flight. [2] It may also be stored within a bomb bay, beneath the main fuselage or even on the back of the carrier aircraft, as in the case of the D-21 drone. [3] Air launching provides several advantages over ground launching, giving the smaller craft an altitude and range boost, while saving it the weight of the fuel and equipment needed to take off on its own. [4]

Contents

History

A Sopwith Camel secured beneath the British HM Airship 23r. HMA R 23 Airship With Camel N6814.jpg
A Sopwith Camel secured beneath the British HM Airship 23r.

One of the earliest uses of air launching used an airship as a carrier and docking station for biplane parasite fighters. These planes would connect to their mothership through a trapeze-like rig, mounted to the top of the upper wing, that attached to a hook dangling from the bottom of the dirigible above. [5] Fighters could be both launched and retrieved this way, giving the airship the speed and striking power of fixed-wing craft, while giving the fighters the range and lingering time of an airship. With advances in airplane technology, especially in range, the value of a dirigible mothership was reduced and the concept became obsolete. [6]

The parasite fighter concept was later revived several times, in an attempt to solve the problem of how to protect bombers from fighter attack. The Convair B-36 was used to air launch several prototype fighters for defense, but none offered performance that could match ground-launched fighters. [5] Even the largest bomber ever mass-produced was too small a mothership for the jet age. Docking also presented its own plethora of problems. [7]

Air launch is the standard way to launch air-to-surface missiles and air-to-air missiles and is mainly used for rocket-powered craft, allowing them to conserve their fuel until lifted to altitude by a larger aircraft. The B-29, B-50, and B-52 have all served in the carrier role for research programs such as the Bell X-1 and X-15. [8] [9]

In the 1960s the SR-71 aircraft was used to launch the Lockheed D-21/M-21 drone to speeds of up to Mach 3. However, this added a degree of difficulty due to the shock wave pattern around an aircraft at supersonic speeds. After three successful tests, the fourth resulted in a collision with the carrier aircraft, in which both craft were destroyed and one crew member drowned. The project was subsequently abandoned. [10] [11]

During the development of the Space Shuttle orbiter in the 1970s, NASA used two modified Boeing 747 airliners, known as the Shuttle Carrier Aircraft, to launch the Space Shuttle Enterprise, a crewed atmospheric test vehicle used to test the orbiter's approach and landing capabilities. These aircraft were subsequently used throughout the Space Shuttle Program to transport the shuttles across long distances. [12] [13]

The Pegasus launch vehicle became the first air-launched orbital rocket when it was launched on April 5, 1990 by the private company Orbital Sciences Corporation (now a part of Northrop Grumman), from a NASA-owned B-52 Stratofortress. It has flown more than 40 times since, launched mostly from the company's own Lockheed L-1011 known as Stargazer. Orbital Sciences was developing the Pegasus II launcher that would have dropped from the purpose-built Scaled Composites Stratolaunch. Pegasus's capacity to low Earth orbit was projected to be 13,500 pounds (6,100 kg). [14] [15]

In the early 2000s, the B-52 was used to launch the X-43 hypersonic testbed aircraft. Recently, the air launch method has gained popularity with commercial launch providers. The Ansari X-Prize $10 million purse was won by a team led by Burt Rutan and Paul Allen for the successful launch of SpaceShipOne twice in a row in 2 weeks, which where the criteria. [16] [17]

In 2010, the SpaceShipTwo launch vehicle began launching. It was the successor the SpaceShipOne launch vehicle, which was retired in 2004. The first SpaceShipTwo aircraft, the VSS Enterprise flew 35 flights successfully from 2010 to 2014. However, on 31 October 2014, the vehicle was destroyed in-flight after an unintentional feathering. Michael Alsbury was killed and Peter Siebold was severely injured. [18] In 2016, another ship, the VSS Unity conducted it's maiden flight, which went smoothly. The VSS Unity conducted 20 test flights. The last one reached space, but without commercial crew onboard. [19] On 11 July 2021, SpaceShipTwo launched 6 people to space. 2 were pilots and the rest tourists. [20] [21] Virgin Galactic repeatdly announced plans to refly the SpaceShipTwo. These plans have been delayed by more than a year and a half. It is currently expected to fly no earlier than the second quarter of 2023. [22] [23]

In 2021, Virgin Galactic announced plans for a SpaceShipThree. This would provide point-to-point transportation across the world. Two ships, the VSS Imagine and VSS Inspire are planned. [24] [25] In 2022, Virgin Galactic announced plans for the new Delta-class launch vehicle. This would be able to reach orbit. It is expected to launch in 2026. [26] [27]

See also

Related Research Articles

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<span class="mw-page-title-main">Spaceplane</span> Spacecraft capable of aerodynamic flight in atmosphere

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<span class="mw-page-title-main">Mother ship</span> Large vehicle that leads, serves, or carries other smaller vehicles

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<span class="mw-page-title-main">Northrop Grumman Pegasus</span> Air-launched rocket

Pegasus is an air-launched launch vehicle developed by Orbital Sciences Corporation (OSC) and now built and launched by Northrop Grumman. Pegasus is the world's first privately developed orbital launch vehicle. Capable of carrying small payloads of up to 443 kg (977 lb) into low Earth orbit, Pegasus first flew in 1990 and remains active as of 2021. The vehicle consists of three solid propellant stages and an optional monopropellant fourth stage. Pegasus is released from its carrier aircraft at approximately 12,000 m (39,000 ft), and its first stage has a wing and a tail to provide lift and altitude control while in the atmosphere. Notably, the first stage does not have a thrust vector control (TVC) system.

<span class="mw-page-title-main">Virgin Galactic</span> Space tourism company

Virgin Galactic Holdings, Inc. is an American spaceflight company founded by Richard Branson and the Virgin Group conglomerate which retains an 11.9% stake through Virgin Investments Limited. It is headquartered in California, and operates from New Mexico. The company is developing commercial spacecraft and aims to provide suborbital spaceflights to space tourists. Virgin Galactic's suborbital spacecraft are air launched from beneath a carrier airplane known as White Knight Two. Virgin Galactic's maiden spaceflight occurred in 2018 with its VSS Unity spaceship. Branson had originally hoped to see a maiden spaceflight by 2010, but the date was delayed for several years, and then delayed again, primarily due to the October 2014 crash of VSS Enterprise.

VSS<i> Enterprise</i> SpaceShipTwo (SS2) spaceplane

VSS Enterprise was the first SpaceShipTwo (SS2) spaceplane, built by Scaled Composites for Virgin Galactic. As of 2004, it was planned to be the first of five commercial suborbital SS2 spacecraft planned by Virgin Galactic. It was also the first ship of the Scaled Composites Model 339 SpaceShipTwo class, based on upscaling the design of record-breaking SpaceShipOne.

<span class="mw-page-title-main">SpaceShipTwo</span> Suborbital spaceplane for space tourism

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<span class="mw-page-title-main">The Spaceship Company</span> Spacecraft manufacturing company

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VSS <i>Unity</i> American commercial sub-orbitable space ship

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<i>Stargazer</i> (aircraft) Aircraft

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<span class="mw-page-title-main">LauncherOne</span> Two-stage, air-launched rocket by Virgin Orbit

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<i>Spirit of Mojave</i> 747 mothership for air launch hypersonic vehicle testbed

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<span class="mw-page-title-main">Kelly Latimer</span>

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VSS <i>Unity</i> VP-03 First SpaceShipTwo spaceflight

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Virgin Galactic <i>Unity</i> 22 2021 American crewed sub-orbital spaceflight

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References

  1. ↑ Alireza Forouzandeh Tabrizi (May 2015). "Air Launch" (PDF). San Jose State University. Retrieved April 11, 2023.
  2. ↑ Rebecca A. Mitchell. "A Conceptual Analysis of Spacecraft Air Launch Methods" (PDF). University of Colorado. Retrieved April 11, 2023.
  3. ↑ "Lockheed D-21B Drone | The Museum of Flight". Museum of Flight. Retrieved 2023-04-09.
  4. ↑ "Pegasus Rocket". Northrop Grumman. Retrieved 2023-04-09.
  5. 1 2 "That time the Air Force designed a tiny fighter jet to launch from strategic bombers". Task & Purpose. 2022-10-27. Retrieved 2023-04-09.
  6. ↑ Miroshnychenko, Yevhen (2022-12-21). "З літака у космос. Історія та перспективи систем повітряного старту". Журнал The Universemagazine Space Tech. Retrieved 2023-04-09.
  7. ↑ "Parasite Fighters: 40 Years Were Spent Trying To Make Them Work". Disciples of Flight. 2017-01-24. Retrieved 2023-04-09.
  8. ↑ "Definition of AIR-LAUNCH". www.merriam-webster.com. Retrieved 2023-04-09.
  9. ↑ "A-10C Thunderbolt II". Air Force. Retrieved 2023-04-09.
  10. ↑ "Lockheed SR-71A". National Museum of the United States Air Force™. Retrieved 2023-04-09.
  11. ↑ "Creating the Blackbird". Lockheed Martin. 2021-01-10. Retrieved 2023-04-09.
  12. ↑ Gibbs, Yvonne (2015-08-11). "Shuttle Carrier Aircraft". NASA. Retrieved 2023-04-09.
  13. ↑ Wong, Daniel (2022-09-27). "The Story Of NASA's Boeing 747 Shuttle Carrier Aircraft". Simple Flying. Retrieved 2023-04-09.
  14. ↑ KSC, Elaine Marconi. "NASA - Pegasus: Countdown 101". www.nasa.gov. Retrieved 2023-04-09.
  15. ↑ "Pegasus XL Launch Vehicle | National Air and Space Museum". airandspace.si.edu. Retrieved 2023-04-09.
  16. ↑ "XPRIZE Foundation Ansari Prize | XPRIZE Foundation". XPRIZE. Retrieved 2023-04-09.
  17. ↑ XPRIZE. "Mojave Aerospace Ventures Wins The Competition That Started". XPRIZE. Retrieved 2023-04-09.
  18. ↑ Tariq Malik (July 28, 2015). "Deadly SpaceShipTwo Crash Caused by Co-Pilot Error: NTSB". Scientific American. Retrieved May 12, 2023.
  19. ↑ "Virgin Galactic rocket plane flies to edge of space". BBC News. 2021-05-22. Retrieved 2023-04-09.
  20. ↑ Space com Staff (2021-07-14). "In photos: Virgin Galactic's 1st fully crewed spaceflight with billionaire Richard Branson". Space.com. Retrieved 2023-04-09.
  21. ↑ Elizabeth Howell (2021-07-10). "Meet the crew launching on Virgin Galactic's 1st fully crewed flight Unity 22". Space.com. Retrieved 2023-04-09.
  22. ↑ "What's next for Virgin Galactic? CEO discusses flight plans in earnings call - Albuquerque Journal". www.abqjournal.com. Retrieved 2023-04-09.
  23. ↑ Foust, Jeff (2023-03-01). "Virgin Galactic in final phases of return to flight". SpaceNews. Retrieved 2023-04-09.
  24. ↑ Mike Wall (2021-03-30). "Meet VSS Imagine: Virgin Galactic unveils its first SpaceShip III spacecraft". Space.com. Retrieved 2023-04-09.
  25. ↑ "Virgin Galactic unveils its first 'SpaceShip III' suborbital spacecraft". SpaceFlight Insider. 2021-04-05. Retrieved 2023-04-09.
  26. ↑ "Virgin Galactic Announces Primary Suppliers for Delta Class Spaceships". www.virgingalactic.com. Retrieved 2023-04-09.
  27. ↑ Patrascu, Daniel (2022-11-03). "Virgin Galactic Delta Six-Passenger Spaceship to Enter Production in 2023, Bell on Deck". autoevolution. Retrieved 2023-04-09.
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