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Airspeed Fluctuations as a Measure of Atmospheric Turbulence

Description: "Increments in structural loads due to atmospheric turbulence can be accurately expressed in terms of flight speed and effective gust velocities (reference 4). Data from which the effective gust velocities could be computed were also obtained during the flights of the XC-35 airplane. These data have been used to determine the significance of the fluctuations in the pilot's indicated-airspeed readings in relation to structural loads to due to atmospheric turbulence" (p. 3).
Date: July 1945
Creator: Tolefson, H. B.
Item Type: Refine your search to only Report
open access

Axial Fatigue Test at Two Stress Amplitudes of 0.032-Inch 24S-T Sheet Specimens With a Circular Hole

Description: Report presenting testing of the effect of applying a number of cycles of a high fatigue stress followed by a number of cycles of relatively low stress to failure has been investigated on 93 drilled specimens of a 24S-T sheet. The results indicated that any general formula for endurance must take sequence into consideration, which makes overly simple formulas inadequate to describe endurance over varying stress amplitudes.
Date: July 1945
Creator: Brueggeman, W. C.; Mayer, M., Jr. & Smith, W. H.
Item Type: Refine your search to only Report
open access

Blade Design Data for Axial-Flow Fans and Compressors

Description: Report presenting an investigation to obtain blade design data for high-efficiency axial-flow fans and compressors, which were carried out in a two-dimensional low-speed cascade tunnel. The effects of camber, solidity, and stagger on blade turning angle and the shape of pressure distributions were determined for a family of five low-drag airfoils.
Date: July 1945
Creator: Bogdonoff, Seymour M. & Bogdonoff, Harriet E.
Item Type: Refine your search to only Report
open access

Charts for the Minimum-Weight Design of 24S-T Aluminum-Alloy Flat Compression Panels With Longitudinal Z-Section Stiffeners

Description: "Design charts are developed for 24S-T aluminum-alloy flat compression panels with longitudinal z-section stiffeners. These charts make possible the design of the lightest panels of this type for a wide range of design requirements. Examples of the use of the charts are given and it is pointed out on the basis of these examples that, over a wide range of design conditions, the maintenance of buckle-free surfaces does not conflict with the achievement of high structural efficiency" (p. 553).
Date: July 9, 1945
Creator: Schuette, Evan H.
Item Type: Refine your search to only Report
open access

Column and plate compressive strengths of aircraft structural materials: extruded 24S-T aluminum alloy

Description: Report presenting column and plate compressive strengths of extruded 24S-T aluminum alloy determined both within and beyond the elastic range from tests of thin-strip columns and local-instability tests of H-, Z-, and channel-section columns. The tests are part of a research investigation to provide data on the structural strength of various aircraft materials. Results regarding compressive stress-strain curves and column and plate compressive strengths are provided.
Date: July 1945
Creator: Heimerl, George J. & Roy, J. Albert
Item Type: Refine your search to only Report
open access

Column and Plate Compressive Strengths of Aircraft Structural Materials: Extruded 24S-T Aluminum Alloy

Description: Column and plate compressive strengths of extruded 24S-T aluminum alloy were determined both within and beyond the elastic range from tests of thin-strip columns and local-instability tests of H-, Z-,and channel-section columns. These tests are part of an extensive research investigation to provide data on the' structural strength of various aircraft materials. The results are presented in the form of curves and charts that are suitable for use in the design and analysis of aircraft structures.
Date: July 1945
Creator: Heimerl, George J. & Roy, J. Albert
Item Type: Refine your search to only Report
open access

Column and plate compressive strengths of aircraft structural materials: extruded 75S-T aluminum alloy

Description: Report presenting column and plate compressive strengths of extruded 75S-T aluminum alloy both within and beyond the elastic range from tests of thin-strip columns and local-instability tests of H-, Z-, and channel-section columns. The tests are part of an extensive research investigation to provide data on the structural strength of various aircraft materials. Results regarding compressive stress-strain curves and column and plate compressive strengths are provided.
Date: July 1945
Creator: Heimerl, George J. & Roy, J. Albert
Item Type: Refine your search to only Report
open access

Comparison of Structural Efficiencies of Diagonal-Tension Webs and Truss Webs of 24S-T Aluminum Alloy

Description: "A comparison is made of the structural efficiencies of truss webs of 24S-T aluminum alloy with previously published values of the structural efficiencies of diagonal-tension webs of 24S-T aluminum alloy on the basis of identical allowable stresses. It is concluded that the diagonal-tension beam (web and flanges) can usually be built to be a more efficient beam than the truss beam, even though over a small range the web of a Warren truss beam is slightly more efficient than the web of a diagona… more
Date: July 1945
Creator: Ochiltree, David W.
Item Type: Refine your search to only Report
open access

A Comparison of Two Flight-Test Procedures for the Determination of Aileron Control Capabilities of an Airplane

Description: Report presenting a comparison of two flight-test procedures for the determination of the aileron control capabilities of an airplane. The procedures consist of performing rudder-fixed aileron rolls from straight unbanked flight and from steady turning flight. Results regarding rate of roll comparison and sideslip-angle comparison are provided.
Date: July 1945
Creator: Skoog, Richard B.
Item Type: Refine your search to only Report
open access

Control of Cylinder Temperatures by Thermostatically Operated Internal-Coolant Valves

Description: Report discusses the results of testing conducted to determine the performance of automatic, internal-coolant valves actuated by cylinder temperatures.The performance of the valves with respect to temperature sensitivity, rapidity of response, and hunting characteristics is described. The relative effects on cylinder performance obtained by internally supplying water and additional fuel were also examined.
Date: July 1945
Creator: Biermann, Arnold E.; Henneberry, Hugh M. & Miller, George R.
Item Type: Refine your search to only Report
open access

The development and application of high-critical-speed nose inlets

Description: From Summary: "An analysis of the nose-inlet shapes developed in previous investigations to represent the optimum from the standpoint of critical speed has shown that marked similarity exists between the nondimensional profiles of inlets which have widely different proportions and critical speeds. With the nondimensional similarity of such profiles established, the large differences in the critical speeds of these nose inlets must be a function of their proportions. An investigation was underta… more
Date: July 1945
Creator: Baals, Donald D.; Smith, Norman F. & Wright, John B.
Item Type: Refine your search to only Report
open access

Economy of internally cooling only the overheated cylinders of aircraft engines

Description: Report presenting an analysis of cylinder-to-cylinder temperature and mixture distributions of four different aircraft engines to determine the possible economy of automatically supply water or additional fuel to only those cylinders having excessive temperatures. The cooling problem as distinguished from the fuel-knock problem was studied and an analysis limited to those cases in which additional cooling is ordinarily obtained by carburetor enrichment was made.
Date: July 1945
Creator: Biermann, Arnold E.; Miller, George R. & Henneberry, Hugh M.
Item Type: Refine your search to only Report
open access

Effect of Blade Loading of the Climb and High-Speed Performance of a Three-Blade Hamilton Standard No. 6507A-2 Propeller on a Republic P-47D Airplane

Description: Report presenting climb and high-speed tests of a Hamilton Standard No. 6507A-2 three-blade propeller, which have been made to determine the effect of blade loading on propeller efficiency. The normal and military power climb efficiencies were found to be about equal at altitudes below 16,000 feet.
Date: July 1945
Creator: Gardner, John J.
Item Type: Refine your search to only Report
open access

Effect of leakage past aileron nose on aerodynamic characteristics of plain and internally balanced ailerons on NACA 66(215)-216, a = 1.0 airfoil

Description: Report presenting an investigation in two-dimensional flow to determine the effect of leakage past the aileron nose on the aerodynamic characteristics of ailerons. The effects of amount and type of leakage, aileron contour, and Mach and Reynolds number are investigated.
Date: July 1945
Creator: Bird, J. D.
Item Type: Refine your search to only Report
open access

Effect of Mach and Reynolds Numbers on the Maximum Lift Coefficient Obtainable in Gradual and Abrupt Stalls of a Pursuit Airplane Equipped With a Low-Drag Wing

Description: Report discussing flight tests on a low-drag wing pursuit airplane to determine the effects of Mach and Reynolds numbers on the maximum lift coefficient obtainable in gradual and abrupt stalls. The obtainable maximum lift coefficient was found to be greatly affected by the Mach and Reynolds numbers in gradual stall. In abrupt stalls, the maximum lift coefficient was affected by the Mach number, but not the Reynolds number.
Date: July 6, 1945
Creator: Spreiter, John R.; Galster, George M. & Blair, William K.
Item Type: Refine your search to only Report
open access

The Effect of Some Design Parameters on Ditching Characteristics

Description: "The purpose of this report is to provide designers of airplanes with information that will be helpful in obtaining good ditching characteristics in new designs. The results from a number of model tests and report of actual ditchings are used as a basis for which to draw conclusions as to the effect on ditching performance of general arrangement, interior arrangement, fuselage shape, and other design parameters. The characteristics of several types of ditching aids that could be incorporated in… more
Date: July 1945
Creator: Dawson, John R.
Item Type: Refine your search to only Report
open access

Effect of the Lift Coefficient on Propeller Flutter

Description: Report presenting flutter of propellers at high angles of attack and flutter data obtained in connection with tests of models of large wind-tunnel propellers. The stall flutter speed was found to be much lower than the calculated classical flutter speed. That flutter speed is only obtainable if the propeller operates at the ideal angle of zero twist.
Date: July 1945
Creator: Theodorsen, Theodore & Regier, Arthur A.
Item Type: Refine your search to only Report
open access

An Experimental Investigation of the Effect of Propellers Used as Aerodynamic Brakes on Stability and Control

Description: "Tests were made of a model representative of a single-engine tractor-type airplane for the purpose of determining the stability and control effects of a propeller used as an aerodynamic brake. The tests were made with single-and dual-rotation propellers to show the effect of type of propeller rotation, and with positive thrust to provide basic data with which to compare the effects of negative thrust. Four configurations of the model were used to give the effects of tilting the propeller thrus… more
Date: July 1945
Creator: Stevens, Victor I.; McCullough, George B. & Hanson, Frederick H.
Item Type: Refine your search to only Report
open access

Flight and Test-Stand Investigation of High-Performance Fuels in Modified Double-Row Radial Air-Cooled Engines 1: Determination of the Cooling Characteristics of the Flight Engine

Description: Report discussing the cooling characteristics of a modified 14-cylinder double-row radial air-cooled engine installed in a four-engine airplane at a pressure altitude of 7000 feet. Testing of the variable charge-air flow, variable cooling-air pressure drop, and variable fuel-air ratio was conducted. The cooling equation, temperature-limited performance, maximum engine temperatures, and other information predicted by calculations is described.
Date: July 9, 1945
Creator: Werner, Milton; Blackman, Calvin C. & White, H. Jack
Item Type: Refine your search to only Report
open access

Graphical and Analytical Methods for the Determination of a Flow of a Compressible Fluid Around an Obstacle

Description: "Chaplygin introduced the hodograph method in the theory of compressible fluid flows and developed a method for constructing stream functions of such flows. This method, which has been extensively used in investigation of compressible fluid flows, is limited in certain respects. The expression for the stream function obtained in this manner can represent only certain types of flow patterns. In general, flow patterns obtained in this way cannot represent the whole flow around an obstacle, but on… more
Date: July 1945
Creator: Bergman, Stefan
Item Type: Refine your search to only Report
open access

Investigation of a Method of Comparison of Metallic Surface Contours by Means of Stereoscopic Electron Micrographs

Description: An investigation to determine the feasibility of measuring surface contours with an aerial-mapping contour finder on stereoscopic electronic micrographs of replicas of metal surfaces. Results regarding the measurement of stereoscopic electron micrographs, measurement of surface contours, possible sources of low stereographic values, and limitations on stereoscopic-contour measurements are provided.
Date: July 1945
Creator: Powell, Allen S.; Clark, Thomas P. & Shaw, Milton C.
Item Type: Refine your search to only Report
open access

Measurement of Flying Qualities of a DeHavilland Mosquito F-8 Airplane (AAF No. 43-334960) 2: Longitudinal Stability and Control Characteristics

Description: Report discussing testing to determine the longitudinal stability and control and stalling characteristics of a DeHavilland Mosquito F-8. Special focus is given to the control forces, elevator control, trim changes, and stick fixed and stick free characteristics of the aircraft.
Date: July 1945
Creator: Crane, H. L.; Talmage, D. H. & Gray, W. E., Jr.
Item Type: Refine your search to only Report
open access

Micromechanical Study of Metals

Description: "The Institut Scientifique Experimental des Transports at Moscow established toward the end of 1925 had since its inception included in its program the study of the mechanism of plastic deformation and the problems associated with it with reference to the materials of the means of transport. Before the program thus determined upon could be carried out, it was necessary to adopt a method of research, or, more exactly, a system of such methods. Because of the modest equipment of the laboratory of… more
Date: July 1945
Creator: Velikov, P. A.; Stchapov, N. P. & Lorenz, W. F.
Item Type: Refine your search to only Report
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