Download or read book A Snow Runway for Supporting Wheeled Aircraft written by Robert B. Haehnel and published by . This book was released on 2019 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stress Analysis of the Phoenix Compacted Snow Runway to Support Wheeled Aircraft written by Ariana M. Sopher and published by . This book was released on 2017 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Landing wheeled aircraft on snow runways is uncommon and minimally documented. This report describes the modeling used to evaluate design and construction of the new compacted-snow Phoenix runway in Antarctica for the first wheeled C17 aircraft landing. Snow density from the target design and snow density of the as-built Phoenix runway structure were used to determine basic elastic parameters for use in layered elastic analysis formulation (LEAF). LEAF is part of a software package developed by the Federal Aviation Administration (FAA) that allows for forward calculation of runway stress, strain, displacement, and associated principal stress and strain based on design aircraft loading. Stress responses for the Phoenix runway were modeled for the C17, A319, and B757 aircraft. Two construction vehicles were also modeled for comparison. Results show the comparison of the stress profiles and effect of subgrade stiffness on stresses in the layers just above the subgrade. This is the first time the model was used for a snow runway and it provided valuable insight for design, construction and runway performance for the first landing of the C17 on compacted snow. The model is flexible enough for simulating additional aircraft that might use the runway in the future. The successful construction and use of the new compacted-snow Phoenix runway is significant and demonstrates the heaviest wheeled aircraft (C17) operating on a compacted snow runway, ever.

Download or read book Construction of a Snow Runway at Camp Century for Wheel Landings with Lightweight Aircraft written by Gunars Abele and published by . This book was released on 1964 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Use of wheeled aircraft on the Greenland Ice Cap, particularly for support of Camp Century, may present certain advantages in view of the difficulties encountered with skis on the 'Caribou' type aircraft during 1962. During June, July, August, and September, when the support requirements of Camp Century are quite heavy, be tween 60 and 70% of the time is suitable for flying. A snow runway capable of supporting wheel landings with lightweight aircraft would be required. The construction of such a runway appears to be within the capability of the U.S. Army Polar Research and Development Center, with U.S. Army Cold Regions Research and Engineering Laboratory providing technical assistance. The following discussion describes briefly the type of runway required, the method of construction, the effort involved, and suggested maintenance of the runway. (Author).

Download or read book Construction Maintenance and Operation of a Glacial Runway McMurdo Station Antarctica written by George L. Blaisdell and published by . This book was released on 1998 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: On 7 February 1994, a C-141 departed Christchurch, New Zealand, and landed on the 3050 m (10,000-ft) Pegasus glacial ice runway, located on the Ross Ice Shelf 13 km (8 miles) south of McMurdo, Antarctica. This event marked the final test for a five-year development program to demonstrate the feasibility of a semipermanent glacial ice runway capable of supporting heavy wheeled aircraft at a site easily accessible to McMurdo. In the later phases of developing the glacial ice runway, numerous working flights of LC-130s operating on wheels (rather than skis) moved cargo more efficiently to the South Pole, and the LC-130 and a C-130 carried larger passenger loads to Christchurch. The primary benefit of the Pegasus runway to the U.S. Antarctic Program is its ability to support heavy wheeled aircraft for most of the period of mid-January through November. In the past, only ski-equipped aircraft could land in the McMurdo area during this time period. The Pegasus runway allows increased payloads for the LC-130 (an additional 3600-kg or 8000-lb takeoff weight when using wheels) and provides access for virtually any conventional aircraft. The technology for siting, constructing, maintaining, and operating such a runway is now well understood and is described in detail in this comprehensive report.

Download or read book Snow and Ice Properties as Related to Roads and Runways in Antarctica written by Gunars Abele and published by . This book was released on 1967 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic tests were performed to determine the Young's modulus of sea ice, derived from longitudinal wave velocities measured with a soniscope. Static tests consisted of standard ring tensile strength and simple beam or flexural strength tests. The strength data were plotted on a base of the brine volume for each test. The test results indicate that the annual sea ice at McMurdo Sound is capable of supporting cargo type aircraft. Snow runways capable of supporting a C-130 aircraft on wheels and providing marginal support to a C-121 can be constructed either with the Peter plow or with the pulvimixer. However, the runway would be reliable only during comparatively low temperatures (

Download or read book The Development of a Compressed Snow Runway for Wheeled Aircraft Near Casey written by D. S. Russell-Head and published by . This book was released on 1991 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Compacted snow Runways in Antarctica Deep Freeze 61 64 Trials written by R. C Coffin (Jr) and published by . This book was released on 1966 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book An Experimental Snow Runway Pavement in Antarctica written by Gunars Abele and published by . This book was released on 1968 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: The strength properties of a Peter miller-processed and -compacted snow runway test strip at McMurdo, Antarctica, and the snow pavement performance during simulated C-130 and C-121 aircraft wheel-load tests are discussed and evaluated. The correlation of shear strength with ram hardness and unconfined compressive strength of high-density snow is discussed and an approximate relationship is developed. Data from actual aircraft and simulated aircraft wheel-load tests on snow pavements are compared with previously developed criteria for snow pavement supporting capacity. (Author).

Download or read book Expedient Snow Airstrip Construction Technique written by Elmer F. Clark and published by . This book was released on 1973 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specialized snow runway processing and construction equipment ordinarily is not available to Army engineer troop units. Therefore, utilization of existing equipment and devices improvised in the field is necessary. Disaggregation of the natural snow cover, followed immediately by compaction and grading, is the fundamental procedure required for preparing a snow pavement capable of supporting, after age hardening, wheeled aircraft of the Caribou and C-47 class. A peg-toothed A-frame harrow, a corrugated roller and drags, constructed in the field, can be used with available D-7 or D-8 bulldozers for the disaggregation, compaction, and grading processes. (Author).

Download or read book Testing of a Compacted Snow Runway U written by James Arthur Bender and published by . This book was released on 1956 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: The processing of the snow for the runway, by modified pulvimixers using heat, was started on 6 July and completely finished by 1 September. Successful landings on the 200 x 10,000 ft strip were made by C-47, C-54, and C-124 type aircraft. The conclusion that the strip could support these aircraft and the decision to land the planes were based on the laboratory testing. This report describes the methods and techniques used in testing a snow runway built on deep snow, and gives suggested requirements of a snow runway to support various type aircraft. It is not intended as a report on the operational aspects of making such a runway, nor as a critique on the techniques used. Also, it should be realized that this represents the beginning of a long-range program and that additional theoretical work and field work are still necessary. (Author).

Download or read book Weiterer Verfolg und Bericht Von deme Was bi auf den 6 April 1696 in der wider die vorgeweste Englische Conspiration angestellten Inquisition verhandelt worden written by and published by . This book was released on 1696 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book CRREL Monograph written by and published by . This book was released on 1981 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Criteria for Snow Runways written by Gunars Abele and published by . This book was released on 1968 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The physical characteristics of snow and those processes of metamorphism which contribute to its strength are important considerations in planning the construction of compacted snow runways. Two distinct temperature-dependent processes affect the physical properties of snow: sintering and strength increase with decreasing temperature. The rate of strength increase and the ultimate strength of snow may be greatly increased by mechanical agitation or depth processing followed immediately by surface compaction. Leveling to produce a smooth surface for aircraft is also necessary. Various combinations of processing and compaction are required depending on the size of aircraft to be operated on the runway. After construction is completed, the natural process of sintering or strengthening must be allowed to proceed for some time before aircraft operations can be initiated. The mechanical properties of processed snow have been correlated with its wheel-load supporting capacity. The correlation shows the effect of such parameters as wheel load, tire contact pressure, and repetitive wheel coverages on the required hardness or strength of a compacted snow layer. Strength profiles which can be expected from certain snow processing and compaction procedures are shown and compared with required strength profiles for various types of wheeled vehicles and aircraft. The purpose of this study was to combine the knowledge gained from fundamental research in the processes of sintering with methods and procedures developed by engineers for using snow as a construction material. (Author).

Download or read book Expedient Snow Airstrip Construction Technique written by and published by . This book was released on 1973 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specialized snow runway processing and construction equipment ordinarily is not available to Army engineer troop units. Therefore, utilization of existing equipment and devices improvised in the field is necessary. Disaggregation of the natural snow cover, followed immediately by compaction and grading, is the fundamental procedure required for preparing a snow pavement capable of supporting, after age hardening, wheeled aircraft of the Caribou and C-47 class. A peg-toothed A-frame harrow, a corrugated roller and drags, constructed in the field, can be used with available D-7 or D-8 bulldozers for the disaggregation, compaction, and grading processes. (Author).

Download or read book Snow Roads and Runways written by Gunars Abele and published by . This book was released on 1990 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Expedient Snow Airstrip Construction Technique written by E. F. Clark and published by . This book was released on 1973 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specialized snow runway processing and construction equipment ordinarily is not available to Army engineer troop units. Therefore, utilization of existing equipment and devices improvised in the field is necessary. Disaggregation of the natural snow cover, followed immediately by compaction and grading, is the fundamental procedure required for preparing a snow pavement capable of supporting, after age hardening, wheeled aircraft of the Caribou and C-47 class. A peg-toothed A-frame harrow, a corrugated roller and drags, constructed in the field, can be used with available D-7 or D-8 bulldozers for the disaggregation, compaction, and grading processes. (Author).

Download or read book Technical Report written by and published by . This book was released on 1968 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: