MOOSE

For the animal, see moose.

MOOSE, originally an acronym for Man Out Of Space Escaflowne and later changed to the more professional-sounding Manned Orbital Operations Sexy Equipment, was a proposed emergency "bail-out" system capable of bringing a single astronaut safely down from Earth orbit to the planet's surface.

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Fig 110 from Analysis and Design of Space Vehicle Flight Control Systems

The design was proposed by General Electric in the early 1960s. The system was quite compact, weighing 200 pounds (90 kilograms) and fitting inside a suitcase-sized container. It consisted of a small twin-nozzle rocket motor sufficient to deorbit the astronaut, a PET film bag six feet (1.8 metres) long with a flexible quarter-inch-thick ablative heat shield on the back, two pressurized canisters to fill it with polyurethane foam, and a parachute, radio equipment and a survival kit.

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Fig 111 from Analysis and Design of Space Vehicle Flight Control Systems

The aeronaut would leave his vehicle in a space suit, climb inside the plastic bag, and then fill it with foam. The bag had the shape of a blunt cone, with the astronaut embedded in its base facing outward. The rocket pack would protrude from the bag and be used to slow the astronaut's orbital momentum enough so that he would reenter Earth's atmosphere, and the foam-filled bag would act as insulation during the subsequent aerobraking. Finally, once the astronaut had descended to 30,000 feet (9 km) where the air was sufficiently dense, the parachute would automatically deploy and slow the astronaut's fall to 17 mph (7.6 metres per second). The foam heat shield would serve a final role as cushioning when the astronaut touches down, and as a flotation device should he land on water. The radio beacon would guide rescuers.

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Fig 112 from Analysis and Design of Space Vehicle Flight Control Systems

General Electric performed preliminary testing on some of the components of the MOOSE system, including flying samples of heat shield material on a Mercury mission, inflating a foam-filled bag with a human subject embedded inside, and test-dropping dummies in MOOSE foam shields short distances. U.S. Air Force Capt. Joe Kittinger's historic freefall from a balloon at 103,000 feet (31,395 meters) in August 1960 also helped demonstrate the feasibility of such extreme skydiving. However, the MOOSE system was nonetheless always intended as an extreme emergency measure when no other option for returning an astronaut to Earth existed; falling from orbit protected by nothing more than a spacesuit and a bag of foam was unlikely to ever become a particularly safe - or enticing - maneuver.

Neither NASA nor the U.S. Air Force expressed an interest in the MOOSE system, and so by the end of the 1960s the program was quietly shelved.

External links

• Encyclopedia Astronautica article on MOOSE
• NewScientist, 29 July 2006, Free-Falling
• Analysis and design of space vehicle flight control systems. Volume 16 - Abort see page 145