Encyclopedia Astronautica
Pegasus VTOVL



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Pegasus Reentry
Credit: NASA
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Pegasus SSTO
Pegasus SSTO Launch Vehicle
Credit: © Mark Wade
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Pegasus Landing
Credit: NASA
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Pegasus Abort
Credit: NASA
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Pegasus SSTO
Pegasus SSTO Launch Vehicle Cutaway
Credit: © Mark Wade
American manned spacecraft. Study 1966. Bono design for semi-single-stage-to-orbit ballistic VTOVL launch vehicle.

Drop tanks were shed on the way to orbit. Pegasus could deliver either a Saturn V-size payload to LEO or 172 passengers and their luggage the 12,000 km from Vandenberg to Singapore in 39 minutes.

The "Pegasus" was a Saturn V-class intercontinental rocket capable of transporting 170-260 passengers and 13-33.5t of cargo at 25,000km/h, or 90t to a 560km low Earth orbit. It would have been available in the 1980s and reduced the travel time from New York to Bombay from 22 hours to only 40 minutes. In Phil Bono's words:

"the SST would be just a small step in the direction of reducing transit time, whereas rocket-propelled vehicles would provide the ultimate in sub-orbital speed for transportation on the Earth's surface. The space age has equipped us with the technology for transporting emergency equipment to any disaster area on Earth in the time it would take for a bus ride across town, despite the conditions of aircraft runways upon arrival. In addition, diplomats, heads of state, chiefs of staff, as well as business executives, could be transported in person to consult, confer, inspect, decide and to lead in a manner currently impossible from distant shores, even with the aid from television."

Pegasus would have carried most of its hydrogen fuel in expendable drop tanks; hardly advisable for a low-cost suborbital launcher but necessary in order to improve the maneuverability of the rocket during reentry and landing since the vehicle then could be made much lighter and smaller. The projected gross liftoff mass was 1520t and the landing weight only 148t. The emergency landing procedure required all eight tanks to be jettisoned before the vehicle made an emergency landing on inflatable pontoons. Pegasus would have carried sixteen 1170KN thrust aerospike rocket modules so the engine-out safety would have been fairly good since only four engines were required for landing. The expected landing accuracy was only 1.6 * 3.2 kilometers so the spaceport would have to be located in a 5km wide uninhabited area for safe launch and landing operations.

Pegasus atmospheric reentry. The combined heatshield + plug nozzle rocket engine would be cooled by circulating liquid hydrogen fuel at the base of the vehicle. The intercontinental passenger version would incorporate fins between the external liquid hydrogen tanks to restrict reentry decelerations to a safe maximum of 2.5-3 g's. Pegasus would have been launched from spaceports which, by the 1980s, were expected to be established near most key cities throughout the world. Off-shore launch platforms were another possibility. Douglas estimated that the Pegasus would cost $3 billion (1964 $s -- $16.1B at 1999 rates) to develop, and the operational vehicles would cost $34M (=$183M in 1999 )per copy if two dozen were built. The first operational Pegasus would have cost $63 million (=$338M in 1999) to produce. According to Phil Bono, "we cannot afford to dismiss the rocket transport as a far-fetched impractical pipe dream. We must design today as if the next 10 years had already passed..."

Characteristics

Crew Size: 172.

Gross mass: 1,520,000 kg (3,350,000 lb).
Height: 34.80 m (114.10 ft).
Thrust: 18,730.00 kN (4,210,670 lbf).

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Associated Countries
See also
Associated Launch Vehicles
  • Pegasus VTOVL American SSTO VTOVL orbital launch vehicle. Bono design for semi-single-stage-to-orbit ballistic VTOVL launch vehicle. Drop tanks were shed on the way to orbit. Pegasus could deliver either a Satun V-size payload to LEO or 172 passengers and their luggage the 12,000 km from Vandenberg to Singapore in 39 minutes. More...

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

Bibliography
  • Gatland, Kenneth and Bono, Philip, Frontiers of Space, Macmillan, New York, 1969.
  • "Pegasus", Space World, 1964/December/p.20.

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