Compacted-snow Runways in Antarctica, Deep Freeze 61-64 Trials PDF Download
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Author: R. C Coffin (Jr)
Publisher:
ISBN:
Category : Airports
Languages : en
Pages : 51
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Book Description
In Deep Freeze 61, NCEL provided technical guidance to a Navy snow- compaction team investigating the practicability of building roads on snow- covered sea ice over McMurdo Sound and runways on the deep snow cover of the Ross Ice Shelf adjacent to McMurdo Station. These investigations and trials continued through Deep Freeze 64. This work was directed toward the development of a layered, compacted-snow runway on deep snow which would support aircraft weighing up to 155,000 pounds with tires on the main wheels inflated to 135 psi; it was only partially successful. During the trials, there were intermittent areas of compacted snow capable of supporting aircraft weighing up to 100,000 pounds with main tires inflated to 90 psi, but low-strength areas prevented takeoffs and landings with aircraft weighing over 25,000 pounds with main tires inflated to 60 psi. New processing and elevating equipment introduced in the Deep Freeze 64 trials showed considerable promise of producing dense, uniform, high -strength, elevated areas of compacted snow. It was concluded that the trials should continue in Deep Freeze 65 to explore the capabilities of this equipment.
Author: R. C Coffin (Jr)
Publisher:
ISBN:
Category : Airports
Languages : en
Pages : 51
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Book Description
In Deep Freeze 61, NCEL provided technical guidance to a Navy snow- compaction team investigating the practicability of building roads on snow- covered sea ice over McMurdo Sound and runways on the deep snow cover of the Ross Ice Shelf adjacent to McMurdo Station. These investigations and trials continued through Deep Freeze 64. This work was directed toward the development of a layered, compacted-snow runway on deep snow which would support aircraft weighing up to 155,000 pounds with tires on the main wheels inflated to 135 psi; it was only partially successful. During the trials, there were intermittent areas of compacted snow capable of supporting aircraft weighing up to 100,000 pounds with main tires inflated to 90 psi, but low-strength areas prevented takeoffs and landings with aircraft weighing over 25,000 pounds with main tires inflated to 60 psi. New processing and elevating equipment introduced in the Deep Freeze 64 trials showed considerable promise of producing dense, uniform, high -strength, elevated areas of compacted snow. It was concluded that the trials should continue in Deep Freeze 65 to explore the capabilities of this equipment.
Author: E. H Moser (Jr)
Publisher:
ISBN:
Category : Runways (Aeronautics)
Languages : en
Pages : 81
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Book Description
Snow-compaction investigations were conducted on the Ross Ice Shelf adjacent to McMurdo Sound during Deep Freeze 65 following investigations made during Deep Freeze 61 through Deep Freeze 64. A 150-by 6,000-foot runway was constructed by adding a 16-inch layer of compacted snow over an existing layer. Construction was completed on 24 November 1964 and the runway was maintained and repaired for aircraft tests until 14 February 1965. Snowplow carriers used in clearing the runway of drift snow greatly reduced the time required for this operation over previous methods using a snowplane. A 6 by 6 truck-tractor with high-flotation tires served as a prime mover for maintenance equipment, and resulted in large savings in time over use of a size 2 snow tractor. This wheeled vehicle also eliminated damage to the runway surface caused by track vehicles. The runway was tested early in the season by a 25,000-pound C-47J aircraft with tire inflation pressure of 60 psi; it was tested five times at approximately 2-week intervals by an LC-130F aircraft weighing from 90,000 to 135,000 pounds with tire inflation pressures of 85 to 95 psi. During the first LC-130F tests, intermittent failures occurred in the DF-65 layer of compacted snow due to misses between lanes of snow processed by the mixers and seams of unprocessed snow between the DF-64 and DF-65 layers.
Author: E. H. Moser
Publisher:
ISBN:
Category : Runways (Aeronautics)
Languages : en
Pages : 73
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Author: G. E. Sherwood
Publisher:
ISBN:
Category : Runways (Aeronautics)
Languages : en
Pages : 26
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Techniques and equipment have been developed to utilize clean, undisturbed snow as a building material for emergency and temporary roads, runways, and skiways in polar regions. However, these routes are often needed in areas where the snow is contaminated. During Deep Freeze 65, a compacted-snow runway was constructed in an area of contaminated snow near McMurdo, Antarctica. The area had been contaminated by oil spillage, soot, and debris from previous operations. Physical property tests were conducted on the compacted snow near the end of Deep Freeze 65 and during Deep Freeze 66. It was concluded that contaminated snow can be processed to produce load-carrying material capable of supporting C-130 aircraft and other heavy loads at temperatures below 20F; however, because of the extra work involved to clear and process such snow, its marginal load-carrying capabilities at temperatures above 20F, and the possibility of low-strength areas, its use is not recommended where clean snow is available. New processing techniques resulted in improved quality control of compacted snow, and it was recommended that effort be continued to improve processing techniques. (Author).
Author:
Publisher:
ISBN:
Category : Civil engineering
Languages : en
Pages : 90
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1348
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Author: Cold Regions Research and Engineering Laboratory (U.S.)
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 36
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Author:
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ISBN:
Category : Arctic regions
Languages : en
Pages : 106
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Author: Naval Civil Engineering Laboratory (Port Hueneme, Calif.)
Publisher:
ISBN:
Category : Bibliographical services
Languages : en
Pages : 374
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 778
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