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  • Other Sources  (7)
  • Mechanical Engineering  (7)
  • 1955-1959  (7)
  • 1959  (7)
  • 1
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    Tire-to-Surface Friction Especially Under Wet Conditions (1959)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: The results of measurements of the maximum friction available in braking on various runway surfaces under various conditions is shown for a C-123B airplane and comparisons of measurements with a tire-friction cart on the same runways are made. The.results of studies of wet-surface friction made with a 12-inch-diameter low-pressure tire on a tire-friction treadmill, with an automobile tire on the tire-friction cart, and with a 44 x 13 extra-high-pressure type VII aircraft tire at the Langley landing-loads track are compared. Preliminary results of tests on the tire-friction treadmill under wet-surface conditions to determine the effect of the wiping action of the front wheel of a tandem-wheel arrangement on the friction available in braking for the rear wheel are given.
    Keywords: Mechanical Engineering
    Type: NASA-MEMO-2-23-59L
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Tire-to-Surface Friction-Coefficient Measurements with a C-123B Airplane on Various Runway Surfaces (1959)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: An investigation was conducted to obtain information on the tire-to-surface friction coefficients available in aircraft braking during the landing run. The tests were made with a C-123B airplane on both wet and dry concrete and bituminous pavements and on snow-covered and ice surfaces at speeds from 12 to 115 knots. Measurements were made of the maximum (incipient skidding) friction coefficient, the full-skidding (locked wheel) friction coefficient, and the wheel slip ratio during braking.
    Keywords: Mechanical Engineering
    Type: NASA-TR-R-20
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Low-Speed Yawed-Rolling Characteristics of a Pair of 56-Inch-Diameter, 32-Ply-Rating, Type 7 Aircraft Tires (1959)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: The low-speed (up to 4 miles per hour) yawed-rolling characteristics of two 56 x 16 32-ply-rating, type 7 aircraft tires under straight-yawed rolling were determined over a range of inflation pressures and yaw angles for a vertical load approximately equal to 75 percent of the rated vertical load. The quantities measured or determined included cornering force, drag force self-alining torque, pneumatic caster vertical tire deflection, yaw angle, and relaxation length. During straight-yawed rolling the normal force generally increased with increasing yaw angle within the test range. The self-alining torque increased to a maximum value and then decreased with increasing angle of yaw. The pneumatic caster tended to decrease with increasing yaw angle.
    Keywords: Mechanical Engineering
    Type: NASA-MEMO-2-7-59L , L-171
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Preliminary Study of a Piston Pump for Cryogenic Fluids (1959)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: Preliminary data are presented covering the performance of a low-speed, five-cylinder piston pump designed for handling boiling hydrogen. This pump was designed for a flow of 55 gallons per minute at 240 rpm with a discharge pressure of 135 pounds per square inch. Tests were made using JP-4 fuel, liquid nitrogen, and liquid hydrogen. Pump delivery and endurance characteristics were satisfactory for the range of operation covered. In connection with the foregoing pump development, the cavitation characteristics of a preliminary visual model, glass-cylinder pump and of a simple reciprocating disk were studied. Subcooling of approximately 0.60 F was obtained from the cavitation produced by reciprocating a disk in boiling nitrogen and in boiling water. The subcooling obtained in a similar manner with liquid hydrogen was somewhat less.
    Keywords: Mechanical Engineering
    Type: NASA-MEMO-3-6-59E , E-239
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Externally Pressurized Journal Gas Bearings (1959)
    In:  Other Sources
    Details
    Publication Date: 2019-08-26
    Description: Externally pressurized gas-lubricated bearings with multiple orifice feed are investigated. An analytical treatment is developed for a semi-cylindrical bearing with 9 orifices and for a cylindrical journal bearing with 192 radial and 24 axial orifices. Experiments are described on models of the two bearing configurations with specially designed fixtures which incorporate pneumatic loading and means for determining pressure profiles, gas flow and gap height. The correlation between theory and experiment is satisfactory.
    Keywords: Mechanical Engineering
    Type: Report No. 30-14
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Investigation of the Maximum Spin-Up Coefficients of Friction Obtained During Tests of a Landing Gear Having a Static-Load Rating of 20,000 Pounds (1959)
    In:  CASI
    Details
    Publication Date: 2019-08-16
    Description: An experimental investigation was made at the Langley landing loads track to obtain data on the maximum spin-up coefficients of friction developed by a landing gear having a static-load rating of 20,000 pounds. The forward speeds ranged from 0 to approximately 180 feet per second and the sinking speeds, from 2.7 feet per second to 9.4 feet per second. The results indicated the variation of the maximum spin-up coefficient of friction with forward speed and vertical load. Data obtained during this investigation are also compared with some results previously obtained for nonrolling tires to show the effect of forward speed.
    Keywords: Mechanical Engineering
    Type: NASA-MEMO-12-20--58L , L-105
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Evaluation of Transpiration-Cooled Turbine Blades with Shells of "Poroloy" Wire Cloth (1959)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: An experimental investigation was made to evaluate the durability and permeability of a group of transpiration-cooled, strut-supported turbine blades. The porous shells were formed from a woven-wire material. The blades were fabricated by a contractor for the Bureau of Aeronautics. The results of permeability tests indicated that the shell material exhibited large random variations in local permeability, which result in excessive coolant flows and very nonuniform cooling. For this reason no heat-transfer evaluations were made because any results would have been inconclusive. Four blades were investigated for structural soundness in a turbo-jet engine operating at a turbine-inlet temperature of approximately 1670 deg F and a turbine tip speed of approximately 1305 feet per second. The maximum temperature of the porous-shell material was approximately 1050 deg F. Inspection of the first two blades after 10 minutes of engine operation revealed that the tips of both of the blades had failed. For the second pair of blades, an improved tip cap was provided by the use of built-up weld extending from strut tip to shell. One of these blades was then operated for 33 hours without failure, and was found to be in good condition at the end of this time. The second blade of this second pair failed within the first 10 minutes of operation because of a poor bond between shell and strut lands.
    Keywords: Mechanical Engineering
    Type: NASA-MEMO-1-29-59E
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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