Encyclopedia Astronautica

ROOST and Astro
Credit: NASA
ROOST - Reusable One-stage Orbital Space Truck
Credit: © Mark Wade
American SSTO orbital launch vehicle. Bono's first design for a reusable single stage to orbit LH2/Lox booster, using conventional engines.

LEO Payload: 454,500 kg (1,002,000 lb) to a 325 km orbit.

Stage Data - ROOST

  • Stage 1. 1 x ROOST. Gross Mass: 10,898,000 kg (24,025,000 lb). Empty Mass: 608,000 kg (1,340,000 lb). Thrust (vac): 165,447.000 kN (37,193,965 lbf). Isp: 410 sec. Burn time: 246 sec. Isp(sl): 345 sec. Diameter: 21.30 m (69.80 ft). Span: 21.30 m (69.80 ft). Length: 106.70 m (350.00 ft). Propellants: Lox/LH2. No Engines: 4. Engine: 5 mlbf. Status: Study 1963.

AKA: Reusable One stage Orbital Space Truck.
Status: Study 1963.
Gross mass: 11,443,400 kg (25,228,300 lb).
Payload: 454,500 kg (1,002,000 lb).
Height: 128.00 m (419.00 ft).
Diameter: 21.30 m (69.80 ft).
Thrust: 139,218.40 kN (31,297,541 lbf).
Apogee: 325 km (201 mi).

More... - Chronology...

Associated Countries
Associated Engines
  • 5 mlbf Notional lox/lh2 rocket engine. 41,361 kN. OOST, ROOST studies 1963. Isp=410s. First flight 1977. More...

See also
  • OOST Bono's earliest design for an expendable single-stage-to-orbit LH2/Lox booster. The baseline version used conventional engines. More...
  • SSTO Category of launch vehicles. Single Stage To Orbit. More...
  • VTOVL The concept of a reusable single-stage-to-orbit Vertical Take-Off Vertical Landing (VTOVL) launch vehicle that would reenter and return to its launch site for turnaround and relaunch was first proposed by Philip Bono in the 1960's. The appealing simplicity of the concept has been offset by the technological risk in developing it. The problem with any single-stage-to-orbit concept is that if the empty weight of the final vehicle has been underestimated it will not be able to deliver any payload to orbit, or even reach orbit. Since weight growth of up to 20% is not unknown in aerospace projects, this is a very real threat which has made both NASA and private investors reluctant to invest the billions of dollars it would take to develop a full-scale flight vehicle. More...

Associated Manufacturers and Agencies
  • Douglas American manufacturer of rockets, spacecraft, and rocket engines. Boeing Huntington Beach, Huntington Beach, CA, USA. More...

Associated Stages
  • ROOST Lox/LH2 propellant rocket stage. Loaded/empty mass 10,898,000/608,000 kg. Thrust 165,447.00 kN. Vacuum specific impulse 410 seconds. More...

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