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Full-scale investigation of the aerodynamic characteristics of a typical single-rotor helicopter in forward flight

Description: Report presenting an investigation of the forward-flight performance characteristics of a typical single-rotor helicopter equipped with main and tail rotors. Testing occurred over a range of tip-speed ratios and thrust coefficients. Results regarding the fuselage effects and rotor characteristics are provided.
Date: May 1947
Creator: Dingeldein, Richard C. & Schaefer, Raymond F.
Item Type: Refine your search to only Report
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Wind-Tunnel Investigation of the Effect of Power and Flaps on the Static Longitudinal Stability Characteristics of a Single-Engine Low-Wing Airplane Model

Description: Note presenting testing to determine the longitudinal stability characteristics with and without power of a typical low-wing, single-engine airplane model with flaps neutral, with a full-span single slotted flap, and with a full-span double slotted flap. With flaps deflected, lift increments were increased by 0.16 for the single slotted flap and 0.42 for the double slotted flap when power was applied. Results regarding lift characteristics, landing characteristics, longitudinal stability, and l… more
Date: April 1947
Creator: Wallace, Arthur R.; Rossi, Peter F. & Wells, Evalyn G.
Item Type: Refine your search to only Report
open access

A rapid compression machine suitable for studying short ignition delays

Description: Report presenting an examination of a machine developed to study the ignition delay of fuels by means of a rapid adiabatic compression. The essential features of the machine are that the compression is completed in about 0.006 second, provision is made for obtaining simultaneous records of piston motion and cylinder pressure, and the combustion cylinder is unlubricated. An extensive explanation of the components of the machine and its applicability to different scenarios are provided.
Date: February 1948
Creator: Leary, W. A.; Taylor, E. S.; Taylor, C. F. & Jovellanos, J. U.
Item Type: Refine your search to only Report
open access

Estimation of control forces of spring-tab ailerons from wind-tunnel data

Description: Report presenting a method for estimating the control forces of spring-tab ailerons from nonlinear wind-tunnel data. Two principal arrangements of the ailerons and spring unit were used, one with the ailerons interconnected and a central spring unit and an arrangement with no interconnection between the ailerons with individual preloaded spring units for each aileron.
Date: June 1947
Creator: Deters, Owen J.
Item Type: Refine your search to only Report
open access

A collection of the collapsed results of general tank tests of miscellaneous flying-boat-hull models

Description: Presented here are the summary charts of the collapsed results of general tank tests of about 100 flying boat hull models. These summary charts are intended to be used as an engineering tool to enable a flying boat designer to grasp more quickly the significance of various hull form parameters as they influence his particular airplane. The form in which the charts are prepared is discussed in some detail in order to make them clearer to the designer. This is a data report, and no attempt has be… more
Date: March 1947
Creator: Locke, F. W. S., Jr.
Item Type: Refine your search to only Report
open access

The Preparation and Physical Properties of Several Aliphatic Hydrocarbons and Intermediates

Description: Note presenting an investigation of the knock ratings of aliphatic hydrocarbons, pure paraffins and olefins prepared in quantities sufficient for engine tests. The report describes the methods of preparation and purification of three pentanes, four hexanes, three heptanes, four octanes, eight nonanes, seven decanes, four hexenes, five octenes, six nonenes, six decenes, and a number of alcohols, ketones, esters, and alkyl halides.
Date: May 1947
Creator: Howard, Frank L.; Mears, Thomas W.; Fookson, A.; Pomerantz, Philip & Brooks, Donald B.
Item Type: Refine your search to only Report
open access

The One-Dimensional Theory of Steady Compressible Fluid Flow in Ducts With Friction and Heat Addition

Description: "Steady, diabatic (nonadiabatic), frictional, variable-area flow of a compressible fluid is treated in differential form on the basis of the one-dimensional approximation. The basic equations are first stated in terms of pressure, temperature, density, and velocity of the fluid. Considerable simplification and unification of the equations are then achieved by choosing the square of the local Mach number as one of the variables to describe the flow" (p. 1).
Date: July 1947
Creator: Hicks, Bruce L.; Montgomery, Donald J. & Wasserman, Robert H.
Item Type: Refine your search to only Report
open access

Experimental Verification of the Rudder-Free Stability Theory for an Airplane Model Equipped With a Rudder Having Positive Floating Tendencies and Various Amounts of Friction

Description: Note presenting an investigation in the free-flight tunnel to obtain an experimental verification of the theoretical rudder-free dynamic stability characteristics of an airplane model equipped with a rudder with positive floating tendencies and various amounts of friction in the rudder system. Results regarding the rudder-free stability without friction and with friction are provided.
Date: July 1947
Creator: Maggin, Bernard
Item Type: Refine your search to only Report
open access

Deformation Analysis of Wing Structures

Description: Note presenting theories of bending and torsion as applied to the problem of calculating the deflections in aircraft shell structures, particularly of wings. Bending as well as torsional deflections are discussed for wings without or with cut-outs.
Date: July 1947
Creator: Kuhn, Paul
Item Type: Refine your search to only Report
open access

Tests to determine the effect of heat on the pressure drop through radiator tubes

Description: Report presenting tests to determine the effect of heat on the pressure drop through radiator tubes made to establish the adequacy of previously developed theory. Results regarding the evaluation of incompressible pressure drop, tubes with smooth entrances, and tubes with transition fixed are provided.
Date: July 1947
Creator: Habel, Louis W. & Gallagher, James J.
Item Type: Refine your search to only Report
open access

A Theoretical Investigation of Hydrodynamic Impact Loads on Scalloped-Bottom Seaplanes and Comparisons With Experiment

Description: Note presenting an analytical method for calculating the hydrodynamic impact loads and motions experienced by seaplane floats and hulls with scalloped (fluted) bottoms. The analysis, which is applicable to floats with cross sections of any shape, considers that the flow about an immersing planing bottom occurs largely in transverse flow planes which are normal to the keel.
Date: July 1947
Creator: Milwitzky, Benjamin
Item Type: Refine your search to only Report
open access

Strength Analysis of Stiffened Beam Webs

Description: Note presenting a method for strength analysis of stiffened shear webs, which has been revised and extended from a previous report. A set of formulas and graphs which cover all aspects of strength analysis is given, experimental data are presented, and the accuracy of the formulas as judged by comparison with the data is discussed.
Date: July 1947
Creator: Kuhn, Paul & Peterson, James P.
Item Type: Refine your search to only Report
open access

Theory of ground vibrations of a two-blade helicopter rotor on anisotropic flexible supports

Description: Report presenting an extension of previous work on the theory of self-excited mechanical oscillations of hinged rotor blades. This particular report details the missing case of one or two blades on unequal supports. Results regarding types of instability, general behavior of rotor system as a function of rotor speed, and effect of damping is provided.
Date: January 1947
Creator: Coleman, Robert P. & Feingold, Arnold M.
Item Type: Refine your search to only Report
open access

Friction Coefficients in a Vaneless Diffuser

Description: Note presenting a determination of friction coefficients for three constant-area vaneless diffusers, used in conjunction with a centrifugal impeller, from static- and total-pressure surveys taken at several radii and from the usual overall measurements of temperature, pressure, and air flow. The average value of the friction coefficient through the entire diffuser was approximately 50 percent higher than that for fully developed turbulent flow in smooth pipes.
Date: May 1947
Creator: Brown, W. Byron
Item Type: Refine your search to only Report
open access

Application of the Analogy Between Water Flow With a Free Surface and Two-Dimensional Compressible Gas Flow

Description: From Introduction: "The development of the measuring apparatus and techniques is presented herein. The application of the analogy to flows through nozzles and about circular cylinders at subsonic velocities extending into supercritical range is also presented."
Date: February 1947
Creator: Orlin, W. James; Lindner, Norman J. & Bitterly, Jack G.
Item Type: Refine your search to only Report
open access

Performance Tests of Wire Strain Gages 5: Error in Indicated Bending Strains in Thin Sheet Metal Due to Thickness and Rigidity of Gage

Description: Note presenting the results of tests to determine the combined effects of rigidity and thickness of wire strain gages on indicated bending strains in thin sheet metal for 15 types of single-element multistrand wire strain gages. In most cases, the indicated extreme-fiber bending strain was greater than the actual strain. The positive error caused by the finite thickness of the gage predominated over the negative error caused by the rigidity of the gage.
Date: July 1947
Creator: Campbell, W. R. & Medbery, A. F.
Item Type: Refine your search to only Report
open access

Performance of a Radial-Inlet Impeller Designed on the Basis of Two-Dimensional-Flow Theory for an Infinite Number of Blades

Description: Note presenting an investigation of a radial-inlet impeller based on two-dimensional-flow theory to establish correlation between flow theory and impeller performance. The simplifying assumptions of an infinite number of blades and an incompressible fluid were made for the impeller design. Results regarding performance characteristics based on standard overall measurements, performance characteristics based on static-pressure measurements, and hydraulic-efficiency characteristics are provided.
Date: March 1947
Creator: Johnsen, I. A.; Ritter, W. K. & Anderson, R. J.
Item Type: Refine your search to only Report
open access

An improved method for calculating the dynamic response of flexible airplanes to gusts

Description: Report presenting a set of equations based on the first mode of wing bending for determining the dynamic responses of an airplane wing structure as induced by gusts. The representation of the airplane is such that the aerodynamic damping of the vibratory motion of the wing is separate from that of the vertical motion of the airplane as a whole.
Date: May 1947
Creator: Putnam, Abbott A.
Item Type: Refine your search to only Report
open access

An Improved Continuous-Indicating Dew-Point Meter

Description: Note presenting the development of a continuous-indicating dew-point meter that automatically maintains a mirror surface at the dew point. The instrument was found to have an average accuracy of 1 degrees Fahrenheit over the range of 75 to -45 degrees. The accuracy of the instrument is uncertain at temperatures below 32 degrees Fahrenheit by the difference in vapor-solid and vapor-liquid equilibrium temperatures.
Date: February 1947
Creator: Friswold, Frank A.; Lewis, Ralph D. & Wheeler, R. Clyde, Jr.
Item Type: Refine your search to only Report
open access

Comparison of design specifications with the actual static transverse stability of 25 seaplanes

Description: Report presenting a comparison of the maximum amount of transverse righting moment at rest provided by auxiliary floats or stub wings for 25 seaplanes and the minimum righting moment required by certain design specifications. Large differences were found to exist between the specifications and 25 designs studied.
Date: April 1947
Creator: Carter, Arthur W.
Item Type: Refine your search to only Report
open access

The Spot Welding of Dissimilar Aluminum Alloys in the 0.040-Inch Thickness

Description: Note presenting an investigation of the spot welding of eight dissimilar alloy combinations in 0.40-inch thickness as part of a program on aircraft spot-welding. The results indicate that in many instances, the chemical treatment of dissimilar alloys prior to spot welding is a less difficult problem than the treatment of some similar alloy combinations. They also indicated that all of the combinations can be spot-welded with little difficulty.
Date: October 1947
Creator: Hess, W. F.; Wyant, R. A. & Winsor, F. J.
Item Type: Refine your search to only Report
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