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Martin Marietta X-24B

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Martin Marietta X-24B

The X-24B in flight
Role Lifting body
Manufacturer Martin Marietta
First flight 1 August 1973
Retired 26 November 1975
Status Out of service
Primary users United States Air Force
Number built 1 (rebuilt X-24A)
Developed from Martin Marietta X-24A

The Martin Marietta X-24B was an experimental US aircraft developed from a joint USAF-NASA program named PILOT (1963–1975). It was designed and built to test lifting body concepts, experimenting with the concept of unpowered reentry and landing, later used by the Space Shuttle.[1] The X-24 was drop launched from a modified B-52 Stratofortress at high altitudes before igniting its rocket engine; after expending its rocket fuel, the pilot would glide the X-24 to an unpowered landing.[2][3]

Design and development

The X-24B on the lakebed at the NASA Dryden Flight Research Center, California

The X-24 was one of a group of lifting bodies flown by the NASA Flight Research Center (now Dryden Flight Research Center) in a joint program with the U.S. Air Force at Edwards Air Force Base in California from 1963 to 1975. The lifting bodies were used to demonstrate the ability of pilots to maneuver and safely land wingless vehicles designed to fly back to Earth from space and be landed like an airplane at a predetermined site.

The X-24B's design evolved from a family of potential reentry shapes, each with higher lift-to-drag ratios, proposed by the Air Force Flight Dynamics Laboratory. To reduce the costs of constructing a research vehicle, the Air Force returned the X-24A to the Martin Marietta Corporation (as Martin Aircraft Company became after a merger) for modifications that converted its bulbous shape into one resembling a "flying flatiron" -- rounded top, flat bottom, and a double delta planform that ended in a pointed nose.[2][3]

First to fly the X-24B was John Manke, in a glide flight on 1 August 1973. He was also the pilot on the first powered mission, on 15 November 1973.[3]


There were a variety of "X-24C" proposals floated between 1972 and 1978. Perhaps the most notable was a Lockheed Skunk Works design, the L-301, which was to use scramjets to reach a top speed of Mach 8.[4]

Operational history

The X-24B made two precise landings on the main concrete runway at Edwards which showed that accurate unpowered reentry vehicle landings were operationally feasible. Pilots on these missions would fly steep descents and then perform a "flare out" maneuver at high speeds to make a 200 mph landing, simulating the landing speed and approach pattern of the Space Shuttle orbiter.[3] These missions, flown by Manke and Air Force Maj. Mike Love, represented the final milestone in a program that helped write the flight plan for the NASA Space Shuttle program.[5]

Top speed achieved by the X-24B was 1,164 mph (1873 km/h), and the highest altitude it reached was 74,130 feet (22.59 km). The pilot on the last powered flight of the X-24B was Thomas C. McMurtry, who also flew the last X-15 flight about seven years earlier.

The X-24B was the last aircraft to fly in Dryden's Lifting Body program. The X-24B was flown 36 times.

The X-24B is on public display at the National Museum of the United States Air Force, Wright-Patterson AFB, Ohio.

X-24B pilots

Specifications (X-24B)

General characteristics

  • Crew: one pilot
  • Length: 37 ft 6 in (11.43 m)
  • Wingspan: 19 ft 0 in (5.79 m)
  • Height: 9 ft 7 in (2.92 m)
  • Wing area: 330 ft² (30.7 m²)
  • Empty weight: 8,500 lb (3,855 kg)
  • Loaded weight: 11,800 lb (5,350 kg)
  • Max. takeoff weight: 13,800 lb (6,260 kg)
  • Powerplant: 1 × XLR-11-RM-13 four-chamber rocket engine, 8,480 lbf (37.7 kN)


See also

Related development
Aircraft of comparable role, configuration and era
Related lists


  1. ^ Reed, R. Dale; Darlene Lister (2002). Wingless Flight: The Lifting Body Story. University Press of Kentucky.   also available as a PDF file.
  2. ^ a b "MARTIN X-24B". National Museum of the US Air Force. 26 August 2009. Retrieved 25 March 2013. 
  3. ^ a b c d "X-24B launch - air drop from mothership". Dryden Flight Research Center. Retrieved 25 March 2013. 
  4. ^ Jenkins, Dennis R. (2001). Space Shuttle: The History of the National Space Transportation System (3rd edition ed.). Voyageur Press.  
  5. ^ "X-24B Precision Landings Proved That Shuttle Could Land Unpowered". 1 July 2011. Retrieved 25 March 2013. 

Miller, Jay. The X-Planes: X-1 to X-45. Hinckley, UK: Midland, 2001.

Rose, Bill, 2008. Secret Projects: Military Space Technology. Hinckley, England: Midland Publishing.

External links

  • NASA Dryden X-24 Photo Collection
  • X-24B at Encyclopedia Astronautica
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