Space activity suit
From Wikipedia, the free encyclopedia
A space activity suit is a kind of spacesuit which provides mechanical pressure by means of elastic garments, as opposed to pressurizing the suit with the breathing gas as is standard practice in regular suits.
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[edit] History
Original research was done by Paul Webb, who in 1968 published a paper titled "The Space Activity Suit: An Elastic Leotard for Extravehicular Activity" in the April 1968 issue of Aerospace Medicine. Research was funded by NASA.
In 1971, Webb, along with James F. Annis, published NASA CR-1892, "Development of a Space Activity Suit", including experimentation with a human volunteer put into a low-pressure chamber to exercise and perform tasks requiring manual dexterity. The results were positive, and the researchers felt that further improvements were possible.
NASA discontinued research into the space activity suit, and pressurized suits are still used as of 2006. However, research is under way at the Massachusetts Institute of Technology (MIT) on a Bio-Suit System as a preparation to President Bush's new space vision.
[edit] Technology
A space activity suit consists of a pressurized bubble helmet (much like those in fully pressurized spacesuits), a positive-pressure breathing system, and an elastic leotard, which provides mechanical counterpressure to the body. The main difference from a pressure suit is that the counterpressure to the surface of the body is provided by an elastic non-airtight fabric instead of gas pressure – skin itself is actually quite airtight.
This has certain advantages: Cooling is accomplished by the evaporation of sweat through the fabric (instead of water cooling systems). The unpressurized and elastic suit allows finer and less laborious movements (which leads to less fatigue and more manual accuracy), has less mass and is much simpler. It is also thought to be safer, since isolated damages to the suit may lead to localized skin swellings or injuries, but not to general (deadly) decompression.
Quoting the NASA Contractor Report from 1971:
In conclusion, the SAS at its present stage of development will protect man from the effects of the vacuum environment, in a garment, which permits improved mobility and natural body movements. Physiologically the approach is sound, and although there remain many problems to be solved, they are principally mechanical in nature. It has been suggested that solution of the mechanical problems, combined with careful tailoring based upon biomechanical analysis, plus the development of specific elastic fabrics, could eventually lead to a space qualified version of the SAS.
[edit] Space activity suits in fiction
For more on space activity suits in fiction, see Spacesuits in fiction.
Space activity suits have featured prominently in much space fiction. Writers including Stephen Baxter and Larry Niven have made use of these suits in their stories. The potential for greater mobility and simpler operation with space activity suit make this type of space suit an attractive choice for fiction, where flexibility of use can be a boon to plot development.
[edit] References
- Webb, Paul. "The Space Activity Suit: An Elastic Leotard for Extravehicular Activity". Aerospace Medicine, April 1968, pp. 376--383.
[edit] External links
- The Space Activity Suit: An Elastic Leotard for Extravehicular Activity, the original 1968 paper (Microsoft DOC format)
- Development of a Space Activity Suit, the 1971 NASA contractor report, NASA CR-1892, as a PDF file
- Physiological Effects of a Mechanical Counter Pressure Suit, PDF file
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| American models | Navy Mark V • Gemini Space suit • MOL Space suit • Apollo/Skylab A7L • Extravehicular Mobility Unit • Advanced Crew Escape Suit |  |
| Russian models | SK-1 • Yastreb • Krechet • Sokol • Orlan • Strizh | |
| Developing technologies | Mark III • I-Suit • Bio-Suit • Space activity suit | |
| Components | Hard Upper Torso • Liquid Cooling and Ventilation Garment • Primary Life Support System • Thermal Micrometeoroid Garment | |
| Related topics | Extra-vehicular activity • Manned Maneuvering Unit • Pressure suit | |
