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Extension of the Chaplygin Proofs on the Existence of Compressible-Flow Solutions to the Supersonic Region

Description: "It has been known for some time that the velocity of sound is not the upper limit for potential flow. S. A. Chaplygin in his paper "On Gas Jets" (NACA TM No. 1063) carried out some interesting proofs on the existence of solutions and gave proofs relating to maxima and minima of certain functions. In the present paper these proofs are extended to include the supersonic potential air-flow field adjacent to the subsonic region treated by Chaplygin" (p. 1).
Date: March 1946
Creator: Theodorsen, Theodore
Item Type: Refine your search to only Report
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A transonic propeller of triangular plan form

Description: Report presenting a proposal for the isosceles triangle twisted into a screw surface about its axis as a propeller for transonic flight speeds. The purpose is to attain the drag reduction associated with a large sweepback in a structurally practicable configuration.
Date: May 1947
Creator: Ribner, Herbert S.
Item Type: Refine your search to only Report
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The application of high-temperature strain gauges to the measurement of vibratory stresses in gas-turbine buckets

Description: The feasibility of measuring the vibration in the buckets of a gas turbine under service conditions of speed and temperature was determined by use of a high temperature wire strain gauge cemented to a modified supercharger turbine bucket. A high-temperature wire strain gauge and the auxiliary mechanical and electrical equipment developed for the investigation are described.
Date: April 1947
Creator: Kemp, R. H.; Morgan, W. C. & Manson, S. S.
Item Type: Refine your search to only Report
open access

Effect of Length-Beam on the Aerodynamic Characteristics of Flying-Boat Hulls

Description: Report presenting a wind-tunnel investigation to determine the effect of length-beam ratio on the aerodynamic characteristics of a family of flying-boat hulls in the presence of a wing. The hulls were designed to have approximately the same hydrodynamic performance with respect to spray and resistance characteristics. Results regarding the two-dimensional and three-dimensional mounting setups, drag reduction, and aerodynamic refinement effects are provided.
Date: June 1947
Creator: Yates, Campbell C. & Riebe, John M.
Item Type: Refine your search to only Report
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A Condition on the Initial Shock

Description: "Initial shocks of the type that occur on airfoils at stream Mach numbers less than unity are shown to satisfy a certain condition, namely, that the local Mach number behind the shock wave tends to approach unity. This result is, in nature, similar to the classic condition of Kutta on the circulation" (p. 1).
Date: March 1946
Creator: Theodorsen, Theodore
Item Type: Refine your search to only Report
open access

Investigation of Effect of Span, Spanwise Location, and Chordwise Location of Spoilers on Lateral Control Characteristics of a Tapered Wing

Description: Note presenting a wind-tunnel investigation of the effect of span, spanwise location, and chordwise location of spoilers on the lateral control characteristics of an unflapped semispan wing equipped with a simple spoiler with a projection 5 percent of the chord. The chordwise investigation involved moving a 50-percent-semispan spoiler from the 50-percent-chord station to the 80-percent-chord station. Results regarding the plain-wing characteristics, spanwise investigation, and chordwise investi… more
Date: May 1947
Creator: Fischel, Jack & Tamburello, Vito
Item Type: Refine your search to only Report
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Pressure Distributions and Force Tests of an NACA 65-210 Airfoil Section With a 50-Percent-Chord Flap

Description: Note presenting pressure distributions and force measurements in the two-dimensional low-turbulence pressure tunnel at low Mach numbers and high Reynolds numbers of an NACA 65-210 airfoil equipped with a 50-percent-chord plain flap. Tests were carried out for flap deflections of 0, 4, 7, and 10 degrees. These flap deflections provided considerably reduced drag coefficients at life coefficients above the design range of the plain airfoil.
Date: January 1947
Creator: Klein, Milton M.
Item Type: Refine your search to only Report
open access

Wind-Tunnel Investigation of the Air Load Distribution on Two Combinations of Lifting Surface and Fuselage

Description: Report presenting wind tunnel measurements of the air load distribution on a canard-type model. Two combinations of lifting surface and fuselage were obtained by removing the wing and stabilizer of the model. Results regarding the fuselage pressure distribution, spanwise loading curves, and variation of lift, drag, and pitching-moment coefficients with angle of attack are provided.
Date: May 1947
Creator: Sandahl, Carl A. & Vollo, Samuel D.
Item Type: Refine your search to only Report
open access

Effect of Variables in Welding Technique on the Strength of Direct-Current Metal-Arc-Welded Joints in Aircraft Steel 1 - Static Tension and Bending Fatigue Tests of Joints in SAE 4130 Steel Sheet

Description: Report presenting testing of arc-welded butt joints in a 1/8-inch SAE 4130 steel sheet of aircraft quality under various conditions of welding and heat treatment in order to evaluate the effects of specific welding-technique factors on the strength of the joints. Results regarding static tension tests and fatigue tests are provided.
Date: July 1947
Creator: Voldrich, C. B. & Armstrong, E. T.
Item Type: Refine your search to only Report
open access

Wind-tunnel investigation of the effects of surface-covering distortion on the characteristics of a flap having undistorted contour maintained for various distances ahead of the trailing edge

Description: Report presenting tests of a modified NACA 65(sub 1)-012 airfoil with a 30-percent airfoil-chord flap with contours simulating various distorted surface-covering shapes for the purpose of investigating practicability of reducing distortion effects to a negligible amount by maintaining an undistorted contour over a small part of the flap chord.
Date: May 1947
Creator: Toll, Thomas A.; Queijo, M. J. & Brewer, Jack D.
Item Type: Refine your search to only Report
open access

The effect of geometric dihedral on the aerodynamic characteristics of a 40 degree swept-back wing of aspect ratio 3

Description: Report presenting force tests at low Reynolds numbers to determine the effect of changes in the geometric dihedral on the aerodynamic characteristics of a wing of aspect ratio 3 with an angle of sweepback of 40 degrees measured at the quarter-chord line. Results regarding lift characteristics, pitching-moment characteristics, rolling-moment characteristics, and yawing moment and lateral force are provided.
Date: December 1946
Creator: Maggin, Bernard & Shanks, Robert E.
Item Type: Refine your search to only Report
open access

Effect of Horizontal-Tail Position on the Hinge Moments of an Unbalanced Rudder in Attitudes Simulating Spin Conditions

Description: Report presenting an investigation in the free-spinning tunnel to determine the effect of horizontal-tail position on rudder hinge moments in simulated spinning conditions. Hinge-moment measurements were made on an unbalanced rudder on a rectangular vertical tail at six positions on the horizontal tail. Results regarding rudder hinge moments, tuft tests, and application of the hinge-moment data are provided.
Date: June 1947
Creator: Stone, Ralph W., Jr. & Burk, Sanger M., Jr.
Item Type: Refine your search to only Report
open access

Effect of Reflex Camber on the Aerodynamic Characteristics of a Highly Tapered Moderately Swept-Back Wing at Reynolds Numbers Up to 8,000,000

Description: Report presenting testing at Reynolds numbers up to 8,000,000 to determine the effectiveness of a reflex-cambered mean line in shifting the low-drag range of a sweptback wing without affecting the longitudinal stability. Two models were tested, one with symmetrical airfoil sections and one with a reflex-cambered mean line. Results regarding the effect of camber, roughness, and variation of aerodynamic characteristics with Reynolds number are provided.
Date: March 1947
Creator: Conner, D. William
Item Type: Refine your search to only Report
open access

Wind-Tunnel Investigation of the Effect of Power and Flaps on the Static Longitudinal Stability and Control Characteristics of a Single-Engine High-Wing Airplane Model.

Description: Note presenting an investigation conducted to determine the effect of power and full-span slotted flaps on the longitudinal stability and control characteristics of a single-engine high-wing airplane. The model was tested at three power conditions: propeller off, propeller windmilling, and power on, and with the flap neutral, single slotted flap, and double slotted flap. The results indicated that deflection of the double slotted flap produced almost twice as much lift increment as did the defl… more
Date: July 1947
Creator: Hagerman, John R.
Item Type: Refine your search to only Report
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Thermodynamic Charts for the Computation of Combustion and Mixture Temperatures at Constant Pressure

Description: Report presenting charts for calculating the combustion temperatures and temperature changes involved in constant-pressure thermodynamic processes of air and the products of combustion of air and hydrocarbon fuels. Examples for different types of fuel and temperature calculation using the charts are also provided.
Date: June 1946
Creator: Turner, L. Richard & Lord, Albert M.
Item Type: Refine your search to only Report
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Critical Stress of Thin-Walled Cylinders in Torsion

Description: Note presenting a theoretical solution for the critical stress of thin-walled cylinders loaded in torsion. The results are presented in terms of simple formulas and curves which are applicable to a wide range of cylinder dimensions. The theoretical results are found to be in fairly good agreement with experimental results.
Date: June 1947
Creator: Batdorf, S. B.; Stein, Manuel & Schildcrout, Murry
Item Type: Refine your search to only Report
open access

Critical Shear Stress of Long Plates With Transverse Curvature

Description: "A theoretical solution is presented for the buckling stress of long plates with transverse curvature loaded in shear. The results are given in the form of curves and formulas for plates with simply supported or clamped edges for a wide range of plate dimensions. Comparisons are made with theoretical solutions obtained in previous investigations" (p. 1).
Date: June 1947
Creator: Batdorf, S. B.; Schildcrout, Murry & Stein, Manuel
Item Type: Refine your search to only Report
open access

Critical Combinations of Torsion and Direct Axial Stress for Thin-Walled Cylinders

Description: "A theoretical solution is presented for the determination of the combinations of direct axial stress and torsion which cause thin-walled cylinders with either simply supported or clamped edges to buckle. This theoretical solution is used in conjunction with available test data to develop empirical curves and formulas for use in design. Comparisons are made with theoretical and empirical solutions obtained in other investigations" (p. 1).
Date: June 1947
Creator: Batdorf, S. B.; Stein, Manuel & Schildcrout, Murry
Item Type: Refine your search to only Report
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Critical Combinations of Shear and Longitudinal Direct Stress for Long Plates With Transverse Curvature

Description: Note presenting a theoretical solution for the buckling stresses of long plates with transverse curvature loaded in shear and longitudinal direct stress. The theoretical critical-stress combinations for plates with either simply supported or clamped edges are given in figures and tables and a comparison is made with previous theoretical solutions. Results regarding the theoretical results, empirical results and design curves, and some interaction formulas are provided.
Date: June 1947
Creator: Batdorf, S. B.; Schildcrout, Murry & Stein, Manuel
Item Type: Refine your search to only Report
open access

Comparison of Static Strengths of Machine Countersunk Riveted Joints in 24S-T, X75S-T, and Alclad 75S-T Sheet

Description: Note presenting static tests made on machine-countersunk riveted joints in 24S-T, X75S-T, and Alclad 75S-T sheet using A17S-T and 24S-T rivets. In order to intensify the cutting action of the rivets, all specimens were made with the depth of countersink just equal to the thickness of the sheet.
Date: May 1946
Creator: Hartmann, E. C. & Zamboky, A. N.
Item Type: Refine your search to only Report
open access

Some Considerations of the Lateral Stability of High-Speed Aircraft

Description: Note presenting an investigation to determine the effect of variations in the lateral-stability derivatives, wing loading, altitude, and radii of gyration on the combination of directional stability and effective dihedral required for lateral stability at the landing and cruising condition. The results of the investigation showed that an airplane with a high wing loading designed for high-speed and high-altitude flight would be laterally stable if the moments of inertia, the location of the pri… more
Date: May 1947
Creator: Sternfield, Leonard
Item Type: Refine your search to only Report
open access

The Langley Two-Dimensional Low-Turbulence Pressure Tunnel

Description: "A description is presented of the Langley two-dimensional low-turbulence pressure tunnel and a history is given of the work done at the Langley Memorial Aeronautical Laboratory which led to the achievement of a remarkably low level of turbulence in the air stream of this wind tunnel. The types of investigations to which the tunnel is suited and the methods of obtaining and correcting data are also discussed" (p. 1).
Date: May 1947
Creator: von Doenhoff, Albert E. & Abbott, Frank T., Jr.
Item Type: Refine your search to only Report
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