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Welding of high chromium steels

Description: A brief description is given of different groups of high chromium steels (rustless iron and stainless steels) according to their composition and more generally accepted names. The welding procedure for a given group will be much the same regardless of the slight variations in chemical composition which may exist within a certain group. Information is given for the tensile properties (yield point and ultimate strength) of metal sheets and welds before and after annealing on coupons one and one-half inches wide. Since welds in rustless iron containing 16 to 18 percent chromium and 7 to 12 percent nickel show the best combination of strength and ductility in the 'as welded' or annealed condition, it is considered the best alloy to use for welded construction.
Date: June 1, 1928
Creator: Miller, W B

Wind-tunnel and flight tests of slot-lip ailerons

Description: The slot-lip ailerons developed by the NACA consist of a flap-type spoiler with an adjoining continuously open slot. The ailerons were developed in an investigation of the delayed response, or lag, of spoiler-type lateral controls. This report presents the results of tests of these slot-lip ailerons made on wing models in the 7 by 10-foot wind tunnel, on a Fairchild 22 airplane in the full-scale wind tunnel and in flight, and on the Weick W1-A airplane in flight.
Date: January 1, 1937
Creator: Shortal, Joseph A

Wind-tunnel corrections at high subsonic speeds particularly for an enclosed circular tunnel

Description: A review of existing publications on wind-tunnel corrections is followed by an approximate method for determining the corrections due to model and wake displacement and to lift. Relations are investigated for fuselages and wings of various spans in closed circular tunnels. A comparison is made between the computations and the tests in the DVL high-speed wind tunnel.
Date: February 1, 1952
Creator: Gothert, Bernhard Hermann

The wave drag of arbitrary configurations in linearized flow as determined by areas and forces in oblique planes

Description: From Summary: "The wave drag, based on linearized theory, of any lifting or non-lifting planar or nonplanar object in a steady supersonic flow is shown to be identical at a fixed Mach number to the average wave drag of a series of equivalent bodies of revolution. The streamwise gradient of area, measured normal to the free stream, at a section of each of these equivalent bodies of revolution is given by the sum of two quantities: 1. the streamwise gradient of area, measured in parallel oblique planes tangent to the Mach cones, along the given object. 2. A term proportional to the resultant force on the object measured in the same oblique planes."
Date: March 24, 1955
Creator: Lomax, Harvard

Weight-flow and thrust limitations due to use of rotating combustors in a turbojet engine

Description: Report presenting the suggestion of an engine configuration that is intended to minimize difficulties caused by exhaust products that are expected to adhere to stationary parts but not rotating parts and exploit the high reactivity of fuel. Component efficiencies of the engine are assigned and its performance is compared with that of a single-stage turbine engine. Results regarding the effect of reaction-nozzle-jet angle, effect of turbine-exit axial Mach number, comparison of rotojet and turbojet performance, and performance of fixed-geometry rotojet engine are provided.
Date: August 17, 1956
Creator: Lezberg, Erwin A.; Blackshear, Perry L., Jr. & Rayle, Warren D.

Welding in airplane construction

Description: The present article attempts to explain the principles for the production of a perfect weld and to throw light on the unexplained problems. Moreover, it is intended to elucidate the possibilities of testing the strength and reliability of welded parts.
Date: February 1, 1928
Creator: Rechtlich, A & Schrenk, M

Welding rustproof steels

Description: The following experimental results will perhaps increase the knowledge of the process of welding rustproof steels. The experiments were made with two chrome-steel sheets and with two chrome-steel-nickel sheets having the composition shown in Table I.
Date: September 1, 1929
Creator: Hoffmann, W

Approximations for the thermodynamic and transport properties of high-temperature air

Description: Report presenting the thermodynamic and transport properties of high-temperature air in closed form starting from approximate partition functions for the major components in air and neglecting all minor components. The compressibility, energy, entropy, specific heats, speed of sound, coefficients of viscosity and thermal conductivity, and Prandtl numbers for air are provided for a range of temperatures and pressures.
Date: March 1958
Creator: Hansen, C. Frederick

Pressure-distribution measurements on the rotating blades of a single-stage axial-flow compressor

Description: Investigation of the pressure distribution about the mean-radius section of the rotating blades of a single-stage axial-flow compressor at a blade Mach number of 0.35. The results indicated that the maximum suction pressure for thin low-camber rotor blades was only slightly greater than for the isolated airfoil of the same section. Results regarding the performance of the compressor, performance of the pressure-transfer device, pressure distribution, critical Mach number, and lift characteristics are provided.
Date: February 1947
Creator: Runckel, Jack F. & Davey, Richard S.

Normal-force and hinge-moment characteristics at transonic speeds of flap-type ailerons at three spanwise locations on a 4-percent-thick sweptback-wing-body model and pressure distribution measurements on an inboard aileron

Description: Report presenting an investigation conducted at the 16-foot transonic tunnel to determine the loading characteristics of flap-type ailerons located at inboard, midspan, and outboard positions on a 45 degree sweptback-wing-body combination. Results indicated that the loading over the ailerons was established by the wing-flow characteristics and the loading shapes were irregular in the transonic speed range.
Date: December 5, 1957
Creator: Runckel, Jack F. & Hieser, Gerald

Condensation of air in supersonic wind tunnels and its effects on flow about models

Description: Report presenting the results of an investigation of condensation phenomena in supersonic wind tunnel. Lower and upper limits for the degree of supersaturation attainable before the onset of condensation of air are discussed. A method is presented for calculating the properties of a stream containing a small fraction of condensed air.
Date: April 1952
Creator: Hansen, C. Frederick & Nothwang, George J.

Calculative method for estimating the interference pressure field at zero lift on a symmetrical swept-back wing mounted on a circular cylindrical body

Description: Report presenting an approximate method for calculating the interference pressure distribution at zero lift of a symmetrical sweptback wing mounted on a circular cylindrical body with the chord plane of the wing passing through the axis of the body. An example is provided using a circular cylindrical body and an untapered wing with 60 degrees of sweepback.
Date: August 5, 1949
Creator: Nielsen, Jack N. & Matteson, Frederick H.

X-ray instrumentation for density measurements in a supersonic flow field

Description: Report describing an instrument based on the principle that an x-ray beam is essentially undeviated while traversing a short path in air. It was used to measure the product of air density and the path length in the 10- by 14-inch supersonic wind tunnel. The measurements obtained were accomplished by comparing the intensity of two beams from the same X-ray source.
Date: December 1952
Creator: Dimeff, John; Hallet, Ralph K., Jr. & Hansen, C. Frederick

The erosion of meteors and high-speed vehicles in the upper atmosphere

Description: From Summary: "A simple inelastic collision model of meteor-atmosphere interaction is used and analytic relations for velocity, deceleration, size, and relative luminous magnitude of meteors are derived and expressed in dimensionless parametric form. The analysis is compared with available quantitative observations of meteor behavior and it is indicated that a large fraction of the atmospheric bombardment energy is used in eroding meteor material. The erosion from large, high-speed vehicles as they traverse the high-altitude, free-molecule portion of the atmosphere is calculated, on the assumption that the vaporization process is similar to that which occurs for meteors."
Date: March 1957
Creator: Hansen, C. Frederick