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Flight Measurements of the Vibratory Bending and Torsional Stresses on a Modified Supersonic Propeller for Forward Mach Numbers up to 0.95

Description: Note presenting vibratory stress measurements obtained in flight on a modified supersonic propeller for forward mach numbers up to 0.95. The magnitude of the vibratory bending stress was low in relation to the strength of the material throughout the flight range of the airplane. Results of a propeller feathering operation at a Mach number of 0.95 indicated no excessive stresses.
Date: June 1958
Creator: O'Bryan, Thomas C.
Item Type: Refine your search to only Report
open access

Effects of Propeller Position and Overlap on the Slipstream Deflection Characteristics of a Wing-Propeller Configuration Equipped With a Sliding and Fowler Flap

Description: Report of an investigation in a static-test facility to determine some of the effects of propeller position and overlap on the slipstream deflection characteristics of a configuration equipped with a sliding and Fowler flap. An investigation of a leading-edge slat, nacelle size, flap segmentation, and number of propellers was also conducted. Results regarding the effect of number of propellers, effect of vertical position of propeller, effect of extending nacelles through flaps, effect of chord… more
Date: September 1958
Creator: Hayes, William C., Jr.; Kuhn, Richard E. & Sherman, Irving R.
Item Type: Refine your search to only Report
open access

Wind-tunnel investigation at low speeds of flight characteristics of a sweptback-wing jet-transport airplane model equipped with an external-flow jet-augmented slotted flap

Description: Report presenting a wind-tunnel investigation at low speeds to determine the flight characteristics of a model of a sweptback-wing jet-transport airplane equipped with an external-flow jet-augmented slotted flap. Results regarding the longitudinal stability characteristics, longitudinal control characteristics, lateral stability characteristics, and lateral control characteristics are provided.
Date: July 1958
Creator: Johnson, Joseph L., Jr.
Item Type: Refine your search to only Report
open access

Application of obliquely mounted strain gage to measurement of residual stresses in disks

Description: Report presenting a method by which the residual stress distribution in a disk can be determined with the aid of the obliquely mounted strain gage when the directions of the principal stresses are radial and tangential. The strain gages are mounted in such a way as to make them sensitive only to the tangential stresses in the disk. Results regarding cutting procedure, accuracy of the method, and an independent check of the method are required.
Date: September 1957
Creator: Hirschberg, M. H.; Kemp, R. H. & Manson, S. S.
Item Type: Refine your search to only Report
open access

Performance at low speeds of compressor rotors having low-cambered NACA 65-series blades with high inlet angles and low solities

Description: Report presenting three compressor rotors with low-cambered 6-percent-thick NACA 65-series blade sections tested at low speeds. The tests were made at three solidities, without guide vanes or stators, over ranges of blade-setting angles and quantity-flow rates. Results regarding the efficiency and pressure-rise coefficients, variation of section turning angle with angle of attack, comparison between low-speed rotor and cascade turning angles, and carpet pots are provided.
Date: August 1958
Creator: Emery, James C. & Howard, Paul W.
Item Type: Refine your search to only Report
open access

Free-Flight Investigation to Determine the Drag of Flat- and Vee- Windshield Canopies on a Parabolic Fuselage With and Without Transonic Indentation Between Mach Numbers of 0.75 and 1.35

Description: Note presenting a free-flight investigation between Mach numbers of 0.75 and 1.35 to determine the effects on model total drag and pressure drag of (a) canopy location, (b) canopy windshield shape, (c) canopy fineness ratio, and (d) transonic-area-rule indentation.
Date: September 1958
Creator: Kouyoumjian, Walter L. & Hoffman, Sherwood
Item Type: Refine your search to only Report
open access

Results of an experimental investigation of small viscous dampers

Description: Report presenting the results of an experimental investigation of several small viscous dampers. The characteristics of the dampers are presented in the form of the magnitudes of the damping forces and spring forces as a function of the maximum velocity of the piston. The results indicated that the temperature has a large effect on the force produced by the dampers and demonstrated the necessity for consideration of the heat generated and dissipated as a result of work done by the dampers.
Date: June 1958
Creator: Silveira, Milton A.; Maglieri, Domenic J. & Brooks, George W.
Item Type: Refine your search to only Report
open access

Preliminary investigation of propane combustion in a 3-inch-diameter duct of inlet-air temperatures of 1400 to 1600 F

Description: Report presenting a determination of ignition delays and combustion efficiencies for propane injected into a heated airstream. Two types of flames were observed for multipoint fuel injectors: a diffusion flame that stabilized at the injector orifices and an ignition-stabilized flame that formed a flame front downstream of the fuel injector. Results regarding combustion of injector-stabilized flames and combustion of ignition-stabilized flames are provided.
Date: July 1957
Creator: Lezberg, Erwin A.
Item Type: Refine your search to only Report
open access

A numerical method for evaluating wave drag

Description: "A numerical method for evaluating the Von Karman wave-drag equation has been developed and applied to the calculation of wave drag for several bodies of revolution. Results indicated good agreement with the exact solution. Sufficient accuracy of wave drag was obtained by using a simple numerical method to determine the second derivatives of the area distributions" (p. 1).
Date: June 1958
Creator: Cahn, Maurice S. & Olstad, Walter B.
Item Type: Refine your search to only Report
open access

Low tire friction and cornering forces on a wet surface

Description: Report presenting an investigation to study typical tire behavior on wet runways, to determine the mechanisms by which water on runways reduced tire forces, and to determine the extent of this tire-force reduction. Under certain conditions of tire pressure, velocity, and water depth, the smooth-treaded tires stop rotating and begin to plane even without the application of brakes. Results regarding the smooth-tire friction coefficients, friction coefficients of the diamond-treaded tire, effect o… more
Date: September 1958
Creator: Harrin, Eziaslav N.
Item Type: Refine your search to only Report
open access

Temperature-Pressure-Time Relations in a Closed Cryogenic Container

Description: Note presenting an experimental study using liquid nitrogen made to verify the existence of a temperature gradient as the factor causing the increase in pressure and to investigate the effect on pressure of altering the temperature gradient. The effect on pressure of different heat-leak rates into the container and different quantities of liquid was also investigated. Results regarding the typical pressure history and temperature gradient, effect of stirring liquid on pressure, effect of heat-l… more
Date: February 1958
Creator: Huntley, Sidney C.
Item Type: Refine your search to only Report
open access

Effects of ground proximity on the thrust of a simple downward-directed jet beneath a flat surface

Description: Report presenting an investigation to determine the effects of some of the basic parameters on the thrust of a simple downward-directed jet beneath a flat plate in a static-thrust facility. Some of the variables investigated included the size and shape of the flat plate, aspect ratio of the plate, distance of the flat plate and nozzle exit above the ground, and surface conditions of the ground.
Date: September 1958
Creator: Spreemann, Kenneth P. & Sherman, Irving R.
Item Type: Refine your search to only Report
open access

Investigation of Minimum Drag and Maximum Lift-Drag Ratios of Several Wing-Body Combinations Including a Cambered Triangular Wing at Low Reynolds Numbers and at Supersonic Speeds

Description: Theoretical and experimental data for wing-body combinations with wings of triangular, arrow, and diamond plan form are presented for Mach numbers of 1.62, 1.93, and 2.41 and a Reynolds number range of 1.4 x 10 to the 6th power to 0.7 x 10 to the 6th power. Included are two each of triangular and arrow plan-form wings cambered for approximately uniform load at m = 1.62 and lift coefficients of 0.08 and 0.20. Liquid-film studies of the flow over the various configurations are also presented.
Date: September 1958
Creator: Brown, Clinton E. & Hargrave, L. K.
Item Type: Refine your search to only Report
open access

Flutter analysis of rectangular wings of very low aspect ratio

Description: Report presenting a flutter analysis for rectangular wings of very low aspect ratio with a constant thickness, which used slender-body aerodynamic theory and thin-plate theory. The results show that the variation of flutter speed and mode shape with aspect ratio. Approximation of the chordwise deflection shape by use of parabolic or cubic curves yields flutter speeds in fair agreement with those of the "exact" theory for a ratio of chord to semispan less than 3 with the cubic approximation givi… more
Date: June 1958
Creator: Fralich, Robert W. & Hedgepeth, John M.
Item Type: Refine your search to only Report
open access

An Approach to the Problem of Estimating Severe and Repeated Gust Loads for Missile Operations

Description: Note presenting an analysis of available airplane measurements of vertical gust velocity in order to arrive at a simple description of the frequency and intensity of gust velocities experienced by airplanes in operations. For the purpose of application to missile operations, the results obtained are modified to eliminate the effects of storm-avoidance procedures normally followed in airplane operations.
Date: September 1958
Creator: Press, Harry & Steiner, Roy
Item Type: Refine your search to only Report
open access

Further Investigation of Fatigue-Crack Propagation in Aluminum-Alloy Box Beams

Description: Report presenting testing of twenty-one box beams constructed according to nine designs that were subjected to fatigue tests at one load level to study fatigue-crack propagation and accompanying stress redistribution. Six designs had stiffeners riveted to the skin, two had integrally stiffened covers, and one had stiffeners bonded to the skin. Results regarding crack initiation, crack propagation, and stresses are provided.
Date: June 1958
Creator: Hardrath, Herbert F. & Leybold, Herbert A.
Item Type: Refine your search to only Report
open access

Effect of Some External Crosswise Stiffeners on the Heat Transfer and Pressure Distribution on a Flat Plate at Mach Numbers of 0.77, 1.39, and 1.98

Description: Note presenting an experimental investigation to determine the aerodynamic heat transfer and pressure distribution on flat-plate models with various arrangements of external stiffeners mounted normal to the direction of air flow. At all three Mach numbers tested, the addition of stiffeners to a flat plate caused large pressure variations and large pressure losses in the flow along the plate. Results regarding pressure distributions, equilibrium temperatures, and heat transfer are provided.
Date: September 1958
Creator: Carter, Howard S.
Item Type: Refine your search to only Report
open access

Study of ground-reaction forces measured during landing impacts of a large airplane

Description: Report presenting the results of tests conducted on a large bomber-type airplane to determine the ground-reaction forces imposed on the main landing gear under actual landing conditions. The vertical force on the landing gear truck at which the oleopneumatic shock strut began to compress varied over a wide range. Results regarding vertical forces, drag forces, and side forces are provided.
Date: May 1958
Creator: Hall, Albert W.; Sawyer, Richard H. & McKay, James M.
Item Type: Refine your search to only Report
open access

Lag in Pressure Systems at Extremely Low Pressures

Description: "A theoretical formula for determining time lags in pressure-measuring systems at all pressures, including extremely low pressures where molecular flow occurs, is derived and shown to be accurate to within 10 percent for pressure down to approximately 0.2 millimeter of mercury (0.556 lb/sq ft) for nearly linear pressure changes" (p. 1).
Date: September 1958
Creator: Davis, William T.
Item Type: Refine your search to only Report
open access

Estimation of Compressible Boundary-Layer Growth Over Insulated Surfaces With Pressure Gradient

Description: Note presenting the incompressible boundary-layer theory of Truckenbrodt extended using a modified Stewartson-type transformation to include compressible boundary-layer development over insulated surfaces. The method is applicable to two-dimensional and axisymmetric, laminar and turbulent boundary layer, and accounts for the pressure gradient along the wall for both compressible and incompressible flow. Some experimental measurements of the boundary layer on small axisymmetric bodies on the wal… more
Date: June 1957
Creator: Englert, Gerald W.
Item Type: Refine your search to only Report
open access

Appraisal of the Hazards of Friction-Spark Ignition of Aircraft Crash Fires

Description: Note presenting a study to determine if common aircraft metals produce friction sparks capable of igniting combustibles that might be spilled in an airplane crash. Samples of aluminum, titanium, magnesium, chrome-molybdenum steel, and stainless steel were dragged over concrete and asphalt runways while a combustible mixture of gasoline, JP-4 fuel, kerosene, or preheated oil was sprayed around the sample.
Date: May 1957
Creator: Campbell, John A.
Item Type: Refine your search to only Report
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