Encyclopedia Astronautica

Credit: NASA
American winged orbital launch vehicle. Martin-Marrietta shuttle Phase A design. X-24B type lifting body orbiter with unique catamaran-configuration booster.

Martin Marietta's unsolicited company-funded shuttle proposal was named "Spacemaster". It was designed for carrying 11,340-22,680 kilogram payloads in the same 4.57 * 18.3-meter cargo envelope as the other Phase A shuttle proposals. Martin's twin-body booster would have reduced the overall length of the mated vehicle and would also have been compatible with different orbiters or rocket stages between bodies. The booster rocket engines are on the aft end of each body. Since the orbiter would be nested during ascent, Martin Marietta predicted that the centre of gravity shift from lift-off to staging would be relatively small. The nested orbiter design would also have reduced booster rocket engine gimbal angles, ascent drag and vehicle angle of attack. The booster landing jet motors were installed in the forward wing to achieve a good centre-of-gravity location.

Stage Data - Spacemaster

  • Stage 1. 1 x Spacemaster-1. Gross Mass: 1,224,490 kg (2,699,530 lb). Empty Mass: 203,342 kg (448,292 lb). Thrust (vac): 28,082.538 kN (6,313,206 lbf). Isp: 442 sec. Burn time: 155 sec. Isp(sl): 392 sec. Diameter: 8.00 m (26.20 ft). Span: 45.12 m (148.03 ft). Length: 57.93 m (190.05 ft). Propellants: Lox/LH2. No Engines: 14. Engine: SSME Study. Status: Study 1967. Comments: Unique Catamaran configuration.
  • Stage 2. 1 x Spacemaster-2. Gross Mass: 362,812 kg (799,863 lb). Empty Mass: 80,000 kg (176,000 lb). Thrust (vac): 4,549.049 kN (1,022,667 lbf). Isp: 459 sec. Burn time: 276 sec. Isp(sl): 359 sec. Diameter: 6.71 m (22.01 ft). Span: 32.62 m (107.02 ft). Length: 48.78 m (160.03 ft). Propellants: Lox/LH2. No Engines: 2. Engine: SSME Study. Status: Study 1967. Comments: Delta Winged, Cross Range 2,742 km.

Status: Study 1967.
Gross mass: 1,587,302 kg (3,499,401 lb).
Height: 128.00 m (419.00 ft).
Diameter: 8.00 m (26.20 ft).
Thrust: 24,905.80 kN (5,599,047 lbf).

More... - Chronology...

Associated Countries
Associated Engines
See also
  • Winged In the beginning, nobody (except Jules Verne) thought anybody would be travelling to space and back in ballistic cannon balls. The only proper way for a space voyager to return to earth was at the controls of a real winged airplane. More...

Associated Manufacturers and Agencies
  • Martin American manufacturer of rockets, spacecraft, and rocket engines. Martin Marietta Astronautics Group (1956), Denver, CO, USA. More...

  • Jenkins, Dennis R,, Space Shuttle: The History of the National Space Transportation System : The First 100 Missions, Third edition, Voyageur Press, 2001.
  • Rainey, "Progress in Technology for Space Shuttles", AAS, AAS 1970/vol.28/p. 3.

Associated Stages
  • Spacemaster-1 Lox/LH2 propellant rocket stage. Loaded/empty mass 1,224,490/203,342 kg. Thrust 28,082.54 kN. Vacuum specific impulse 442 seconds. Unique Catamaran configuration. More...
  • Spacemaster-2 Lox/LH2 propellant rocket stage. Loaded/empty mass 362,812/80,000 kg. Thrust 4,549.05 kN. Vacuum specific impulse 459 seconds. Delta Winged, Cross Range 2,742 km More...

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