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Some Investigations of the General Instability of Stiffened Metal Cylinders 5: Stiffened Metal Cylinders Subjected to Pure Bending

Description: This report summarizes the work that has been carried on in the experimental investigation of the problem of general instability of stiffened metal cylinders subjected to pure bending at the C.I.T. This part of the investigation included tests of 46 sheet-covered specimens. The most significant result was the determination of a new design parameter for the case of a stiffened metal cylinder subjected to pure bending.
Date: August 1943
Creator: Hoff, N. J.; Boley, Bruno A. & Nardo, S. V.
Item Type: Refine your search to only Report
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Some Investigations of the General Instability of Stiffened Metal Cylinders 3: Continuation of Tests of Wire-Braced Specimens and Preliminary Tests of Sheet-Covered Specimens

Description: "This is the third of a series of reports covering an investigation of the general instability problem by the California Institute of Technology. The first five reports of this series cover investigations of the general instability problem under the loading conditions of pure bending and were prepared under the sponsorship of the Civil Aeronautics Administration. The succeeding reports of this series cover the work done on other loading conditions under the sponsorship of the National Advisory … more
Date: August 1943
Item Type: Refine your search to only Report
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Correction of the Lifting-Line Theory for the Effect of the Chord

Description: "It is shown that a simple correction for the chord of a finite wing can be deduced from the three-dimensional potential flow around an elliptic plate. When this flow is compared with the flow around a section of an endless plate, it is found that the edge velocity is reduced by the factor 1/E, where E is the ratio of the semiperimeter to the span. Applying this correction to the circulation brings the theoretical lift into closer agreement with experiments" (p. 1).
Date: July 1941
Creator: Jones, Robert T.
Item Type: Refine your search to only Report
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Wind-tunnel investigation of an NACA 23012 airfoil with several arrangements of slotted flaps with extended lips

Description: "An investigation was made in the NACA 7- by 10-foot wind tunnel to determine the effect of slot-lip location on the aerodynamic section characteristics of an NACA 23012 airfoil with a 30-percent-chord slotted flap. Tests were made with slot lips located at 90 and 100 percent of the airfoil chord and with two different flap shapes. The results are compared with a slotted flap previously developed by the National advisory Committee for Aeronautics with a slot lip located at 83 percent of the air… more
Date: May 1941
Creator: Lowry, John G.
Item Type: Refine your search to only Report
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Bending tests of a monocoque box

Description: A monocoque box beam consisting of a 24S-T aluminum-alloy sheet reinforced by four bulkheads and by longitudinal stringers and corner posts was subjected to bending loads as follows: pure bending about the lift axis, cantilever bending about the lift axis, and pure bending about both lift and drag axis. Longitudinal strains were measured for loads up to a load at which permanent set became measurable. The loads were sufficient to produce buckling of the sheet between stringers on the compressio… more
Date: November 1942
Creator: McPherson, Albert E.; Ramberg, Walter & Levy, Samuel
Item Type: Refine your search to only Report
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The aerodynamics of a wind-tunnel fan

Description: From Introduction: "This paper deals only with the aerodynamics of the fan proper and demonstrates the manner in which the radial distribution of axial velocity of fluid through a fan is governed by geometry of the fan itself."
Date: August 1941
Creator: Corson, Blake W.
Item Type: Refine your search to only Report
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Some Investigations of the General Instability of Stiffened Metal Cylinders 2: Preliminary Tests of Wire-Braced Specimens and Theoretical Studies

Description: "This is the second of a series of reports covering an investigation of the general instability problem by the California Institute of Technology. The first five reports of this series cover investigations of the general instability problem under the loading conditions of pure bending and were prepared under the sponsorship of the Civil Aeronautics Administration. The succeeding reports of this series cover the work done on other loading conditions under the sponsorship of the National Advisory… more
Date: July 1943
Item Type: Refine your search to only Report
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Some Investigations of the General Instability of Stiffened Metal Cylinders 6: Stiffened Metal Cylinders Subjected to Combined Bending and Transverse Shear

Description: "This is the sixth of a series of reports covering an investigation of the general instability problem by the California Institute of Technology. This report and the succeeding reports of this series cover the work done on other loading conditions under the sponsorship of the National Advisory Committee for Aeronautics. This report summarizes the work that has been carried on in the experimental investigation of the problem of general instability of stiffened metal cylinders subjected to combin… more
Date: September 1943
Item Type: Refine your search to only Report
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Stresses in and general instability of monocoque cylinders with cutouts 1: experimental investigation of cylinders with a symmetric cutout subjected to pure bending

Description: "Ten 24S-T alclad cylinders of 20-inch diameter, 45- or 58-inch length, and 0.012-inch wall thickness, reinforced with 24S-T aluminum alloy stringers and rings were tested in pure bending. In the middle of the compression side of the cylinders there was a cutout extending over 19 inches in the longitudinal direction, and over an angle of 45 degrees, 90 degrees, or 135 degrees in the circumferential direction. The strain in the stringers and in the sheet covering was measured with metal electric… more
Date: June 1946
Creator: Hoff, N. J. & Boley, Bruno A.
Item Type: Refine your search to only Report
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The Development of a Lateral-Control System for Use With Large-Span Flaps

Description: "A spoiler-type lateral-control system has been developed for use on the Northrop P-61 airplane. The lateral-control system is to be used with large-span flaps and consists of a thin circular arc spoiler, linked with a short-span plain aileron located just outboard of the spoiler. This unconventional lateral-control system has been accepted with enthusiasm by the pilots who have flown the airplane" (p. 1).
Date: January 1946
Creator: Ashkenas, I. L.
Item Type: Refine your search to only Report
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Notes on the Stability and Control of Tailless Airplanes

Description: "Problems involved in the stability and control of tailless airplanes are discussed. Such factors as the location of the aerodynamic center and its effect on the longitudinal stability, longitudinal trim with high-lift devices, the effects of various changes in the shape of the wing on lateral stability, and the effects of nacelles are covered. It appears that sufficient stability and controllability can be secured without sweepback" (p. 1).
Date: December 1941
Creator: Jones, Robert T.
Item Type: Refine your search to only Report
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Some Investigations of the General Instability of Stiffened Metal Cylinders 4: Continuation of Tests of Sheet-Covered Specimens and Studies of the Buckling Phenomena of Unstiffened Circular Cylinders

Description: "This is the fourth of a series of reports covering an investigation of the general instability problem by the California Institute of Technology. The succeeding reports of this series cover the work done on other loading conditions under the sponsorship of the National Advisory Committee for Aeronautics. This report is to deal primarily with the continuation of tests of sheet-covered specimens and studies of the buckling phenomena of unstiffened circular cylinders" (p. 1).
Date: August 1943
Item Type: Refine your search to only Report
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Wind-tunnel investigation of end-plate effects of horizontal tails on a vertical tail compared with available theory

Description: A vertical-tail model with stub fuselage was tested in combination with various simulated horizontal tails to determine the effect of horizontal-tail span and location on the aerodynamic characteristics of the vertical tail. Available theoretical data on end-plate effects were collected and presented in the form most suitable for design purposes. Reasonable agreement was obtained between the measured and theoretical end-plate effects of horizontal tails on vertical tails, and the data indicated… more
Date: April 1946
Creator: Murray, Harry E.
Item Type: Refine your search to only Report
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Requirements for Auxiliary Stiffeners Attached to Panels Under Combined Compression and Shear

Description: "Panels of aluminum alloy sheets, framed by side and end stiffeners, were subjected to combined loading by means of offset knife edges applying loads to top and bottom end plates with reacting forces against the end plates supplied by laterally acting rollers. The test specimens were 17S-T aluminum alloy shoots 0.040 inch thick in panels of 10-inch width and three different lengths (approximately 10, 26, and 30 inch). Data were obtained for the bowing of transverse and longitudinal ribs of rect… more
Date: September 16, 1943
Creator: Scott, Merit & Weber, Robert L.
Item Type: Refine your search to only Report
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Properties of low-aspect-ratio pointed wings at speeds below and above the speed of sound

Description: "Low-aspect-ratio wings having pointed plan forms are treated on the assumption that the flow potentials in planes at right angles to the long axis of the airfoils are similar to the corresponding two-dimensional potentials. For the limiting case of small angles of attack and low aspect ratios the theory brings out the following significant properties: (1) The lift of a slender, pointed airfoil moving in the direction of its long axis depends on the increase in width of the sections in a downst… more
Date: May 11, 1945
Creator: Jones, Robert T.
Item Type: Refine your search to only Report
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Stress Distribution in and Equivalent Width of Flanges of Wide, Thin-Wall Steel Beams

Description: "The use of different forms of wide-flange, thin-wall steel beams is becoming increasingly widespread. Part of the information necessary for a national design of such members is the knowledge of the stress distribution in and the equivalent width of the flanges of such beams. This problem is analyzed in this paper on the basis of the theory of plane stress. As a result, tables and curves are given from which the equivalent width of any given beam can be read directly for use in practical design… more
Date: November 1940
Creator: Winter, George
Item Type: Refine your search to only Report
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Square Plate With Clamped Edges Under Normal Pressure Producing Large Deflections

Description: "A theoretical analysis is given for the stresses and deflections of a square plate with clamped edges under normal pressure producing large deflections. Values of the bending stress and membrane stress at the center of the plate and at the midpoint of the edge are given for center deflections up to 1.9 times the plate thickness. The shape of the deflected surface is given for low pressures and for the highest pressure considered" (p. 1).
Date: May 1942
Creator: Levy, Samuel
Item Type: Refine your search to only Report
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Damping characteristics of dashpots

Description: An investigation of the damping characteristics of dashpots was carried out combining theory and experiment. Laminar flow was assumed and three equations for the steady velocity of a piston moving in a cylinder filled with liquid were derived. In the first equation, the piston was assumed coaxial in the cylinder and, in the second equation, the piston was assumed eccentric in the cylinder with an element of the piston in contact with the cylinder wall. The third equation is for a piston of circ… more
Date: October 1941
Creator: Peterson, John B.
Item Type: Refine your search to only Report
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A Study of Combustion in a Flowing Gas

Description: Note presenting the results of a preliminary study of combustion in flowing gases and apparatus for obtaining high rates of heat release per unit volume of combustion space are described. Tests were made over a wide range of fuel-air ratios, inlet-mixture velocities, and electrical heat inputs, using propane gas as the fuel. Results indicate that the greater the surface-volume ratio, or the greater the amount of heat addible to the gas stream, the greater the inlet-mixture velocity at which app… more
Date: April 1946
Creator: Gilbert, Mitchell; Haddock, Gordon & Metzler, Allen
Item Type: Refine your search to only Report
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Stresses at Cut-Outs in Shear Resistant Webs as Determined by the Photoelastic Method

Description: "Stress concentration factors for shear stresses around cut-outs in the webs of beams having shear resistant webs were determined by the photoelastic method. Webs with circular, square, and rectangular cut-outs were tested. The effect of reinforcements around square and circular cut-outs was investigated" (p. 1).
Date: October 1945
Creator: Ruffner, Benjamin F. & Schmidt, Calvin L.
Item Type: Refine your search to only Report
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A Fixture for Compressive Tests of Thin Sheet Metal Between Lubricated Steel Guides

Description: Note presenting a fixture for compressive tests of thin sheet metal. It consists of two hardened steel guides between which the specimen is held by two adjustable clamps. Results and analysis regarding steel versus brass guides, the lubricant film, tests without the subpress, and comparison of tensile tests with compressive tests using steel guides are provided.
Date: April 1946
Creator: Miller, James A.
Item Type: Refine your search to only Report
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Charts of Thermodynamic Properties of Fluids Encountered in Calculations of Internal Combustion Engine Cycles

Description: "A single chart has been prepared that simplifies the calculation of the thermodynamic properties of air, various octene-air mixtures, and mixtures of those with their products of combustion at all temperatures below which chemical dissociation becomes unimportant. The chart is based on the use of 1 pound mol of mixture, and examples of its use are given in the form of the calculation of a turbocompressor power plant and a supercharged Otto engine cycle" (p. 1).
Date: May 1946
Creator: Hottel, H. C. & Williams, G. C.
Item Type: Refine your search to only Report
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Effect of Sweepback and Aspect Ratio on Longitudinal Stability Characteristics of Wings at Low Speeds

Description: Note presenting an analysis of the available data on the longitudinal stability characteristics of sweptback wings at low speeds. The analysis indicated that the shape of the pitching-moment curve near the stall for sweptback wings is greatly dependent on the aspect ratio. The addition of a horizontal tail behind the wings may be destabilizing and requires further investigation.
Date: July 1946
Creator: Shortal, Joseph A. & Maggin, Bernard
Item Type: Refine your search to only Report
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