UNT Libraries Government Documents Department - 32 Matching Results

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Aerodynamic and Hydrodynamic Tests of a Family of Models of Flying-Boat Hulls Derived From a Streamline Body: NACA Model 84 Series

Description: Report presenting a series of related flying-boat hull forms with various combinations of aerodynamic and hydrodynamic requirements that were tested in an NACA tank and high-speed tunnel. Effects explored included varying the height of the bow, varying the height of the stern, increasing the angle of dead rise at the bow, decreasing the angle of dead rise on the afterbody, increasing the depth of step, increasing the angle of afterbody keel, adding chine flare, adding a third planing surface, a… more
Date: September 1943
Creator: Parkinson, John B.; Olson, Roland E.; Draley, Eugene C. & Luoma, Arvo A.
Item Type: Refine your search to only Report
open access

An Approximate Method of Shear-Lag Analysis for Beams Loaded at Right Angles to the Plane of Symmetry of the Cross Section

Description: Report discussing strain measurements made on a box beam of triangular cross section and on two beams of D-section under transverse bending. Information about the arrangement of the beams and experimental and calculated stresses for different boxes.
Date: September 1943
Creator: Kuhn, Paul & Brilmyer, Harold G.
Item Type: Refine your search to only Report
open access

Calculated and measured turning performance of a Navy F2A-3 airplane as affected by the use of flaps

Description: Report presenting results of flight tests to determine the turning performance of a Navy F2A-3 airplane over a range of speeds for three flap deflections at two altitudes. The results are correlated with an analytical study of turning performance in which the effect of thrust on maximum lift coefficient was considered.
Date: September 1943
Creator: Clousing, Lawrence A.; Gadeberg, Burnett L. & Kauffman, William M.
Item Type: Refine your search to only Report
open access

Critical Compressive Stress for Curved Sheet Supported Along All Edges and Elastically Restrained Against Rotation Along the Unloaded Edges

Description: "A formula is given for the critical compressive stress for slightly curved sheet with equal elastic restraints against rotation along the unloaded edges. The theory of small deflections is used and the formula reduces to that given by Timoshenko for the case of simply-supported edges. For larger curvatures, a modification of Redshaw's formula to include the effect of edge restraint is suggested" (p. 1).
Date: September 1943
Creator: Stowell, Elbridge Z.
Item Type: Refine your search to only Report
open access

The Effect of Xylidines on the Load-Carrying Capacity of an Aircraft Engine Oil - 2

Description: Report presenting testing of the effect of xylidines on the load-carrying capacity of an aircraft-engine oil in several test devices. There is also interest in the suitability of xylidines as an antiknock component in aviation gasoline, so xylidines were added to the gasoline mixes used in several different machines.
Date: September 1943
Creator: Olson, Walter T. & Spurr, Robert A.
Item Type: Refine your search to only Report
open access

Effects of Mean-Line Loading on the Aerodynamic Characteristics of Some Low-Drag Airfoils

Description: "The effect of variations in the type of mean line on the section characteristics of several representative NACA low-drag airfoils was investigated. The test results are compared with theoretical predictions and indicate trends that facilitate the choice of mean line in the absence of tests" (p. 1).
Date: September 1943
Creator: Davidson, Milton & Turner, Harold R., Jr.
Item Type: Refine your search to only Report
open access

The Flow of a Compressible Fluid Past a Curved Surface

Description: "An iteration method is employed to obtain the flow of a compressible fluid past a curved surface. The first approximation which leads to the Prandtl-Glauert rule, is based on the assumption that the flow differs but little from a pure translation. The iteration process then consists in improving this first approximation in order that it will apply to a flow differing from pure translatory motion to a greater degree. The method fails when the Mach number of the undisturbed stream reaches unity … more
Date: September 13, 1943
Creator: Kaplan, Carl
Item Type: Refine your search to only Report
open access

General porpoising tests on flying-boat-hull models

Description: Report presenting evidence in support of the propriety of substituting a general porpoising test of flying boat hull models in place of the usual specific test. The results of a general test are presented and compared with the results of a specific test of the same model.
Date: September 1943
Creator: Locke, F. W. S., Jr.
Item Type: Refine your search to only Report
open access

Heat Transfer Through Turbulent Friction Layers

Description: "The "general Prandtl number" Pr(exp 1) - A(sub q)/A Pr, aside from the Reynolds number determines the ratio of turbulent to molecular heat transfer, and the temperature distribution in turbulent friction layers. A(sub q) = exchange coefficient for heat; A = exchange coefficient for momentum transfer. A formula is derived from the equation defining the general Prandtl number which describes the temperature as a function of the velocity" (p. 1).
Date: September 1943
Creator: Reichardt, H.
Item Type: Refine your search to only Report
open access

Magnolia Oil Field, Columbia County, Arkansas: Part 1. Petroleum-Engineering Study; Part 2. Derivation and Application of Material-Balance Equations

Description: Report issued by the U.S. Bureau of Mines on studies conducted at the Magnolia oil fields in Columbia County, Arkansas. History, geology, and methods are presented. This report includes tables, graphs, maps, and illustrations.
Date: September 1943
Creator: Carpenter, Charles B.; Schroeder, H. J. & Cook, Alton B.
Item Type: Refine your search to only Report
open access

Measurements of the flying qualities of a Bell P-39D-1 airplane (AAF NO. 41-28378)

Description: Report discussing an investigation of the flight qualities of the Bell P-39D-1 airplane. Information about the longitudinal stability and control characteristics, lateral and directional stability and control, stalling characteristics, and control friction is provided.
Date: September 21, 1943
Creator: Johnson, Harold I.; Liddell, C. J. & Hoover, H. H.
Item Type: Refine your search to only Report
open access

NACA Investigation of a Jet-Propulsion System Applicable to Flight

Description: "Following a brief history of the NACA investigation of jet propulsion, a discussion is given of the general investigation and analysis leading to the construction of the jet-propulsion ground-test mock-up. The results of burning experiments and of test measurements designed to allow quantitative flight performance predictions of the system are presented and correlated with calculations. These calculations are then used to determine the performance of the system on the ground and in the air at … more
Date: September 17, 1943
Creator: Ellis, Macon C., Jr. & Brown, Clinton E.
Item Type: Refine your search to only Report
open access

Notes on the Effect of Surface Distortions on the Drag and Critical Mach Number of Airfoils

Description: "The effect of two-dimensional bumps and surface waviness on the pressure distribution over airfoils is considered. It is shown that the results of the analysis may be useful in evaluating the effects of accidental or intended surface distortions on the drag and critical Mach number of airfoils" (p. 1).
Date: September 1943
Creator: Allen, H. Julian
Item Type: Refine your search to only Report
open access

Notes on the Skipping of Seaplanes

Description: Report discusses five tests related to seaplane skipping and attempts to prevent it by changing the depths of step to avoid large suction force on the afterbody generated by the flow behind a shallow step. Flying boats of various sizes and weights were tested during landing and several degrees of trim were tested for boats that had a particularly shallow step. Design suggestions for future flying boats are also included.
Date: September 1943
Creator: Parkinson, John B.
Item Type: Refine your search to only Report
open access

Periodic Heat Transfer at Small Pressure Fluctuations

Description: "The effect of cyclic gas pressure variations on the periodic heat transfer at a flat wall is theoretically analyzed and the differential equation describing the process and its solution for relatively. Small pressure fluctuations developed, thus explaining the periodic heat cycle between gas and wall surface. The processes for pure harmonic pressure and temperature oscillations, respectively, in the gas space are described by means of a constant heat transfer coefficient and the equally consta… more
Date: September 1943
Creator: Pfriem, H.
Item Type: Refine your search to only Report
open access

Protection of Nonmetallic Aircraft From Lighting 1: General Analysis

Description: Report presenting a preliminary way to give a logical and consistent analysis of the problem of providing adequate protection to the personnel, contents, and structure of nonmetallic aircraft against the effects of electric shock, mechanical damage, and fire which are almost certain to occur if an unprotected aircraft is struck by lightning. The analysis should bring out clearly the questions on which further experimental work is needed and the assumptions that must be present to bridge the gap… more
Date: September 1943
Item Type: Refine your search to only Report
open access

Representative Operating Charts of Propellers Tested in the NACA 20-Foot Propeller-Research Tunnel

Description: Report presents the results of tests of full-scale propellers made in the 20-foot propeller-research tunnel (PRT) at the Langley Memorial Aeronautical Laboratory. The power coefficients of all dual-rotating propellers in the report represent the sum of the power coefficients of the front and rear propellers and are for the test conditions in which blade angles of the front and rear propellers were set to absorb approximately equal power at peak efficiency only.
Date: September 1943
Creator: Gray, W. H. & Mastrocola, Nicholas
Item Type: Refine your search to only Report
open access

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
open access

Some Analyses of Systematic Experiments on the Resistance and Porpoising Characteristics of Flying-Boat Hulls

Description: Report discusses the results of analyses and test results of the porpoising characteristics of flying boats. Equations for calculating stability limits with given hull forms under various combinations of loading and aerodynamic conditions and for modifications of the afterbody are provided.
Date: September 1943
Creator: Davidson, Kenneth S. M. & Locke, F. W. S., Jr.
Item Type: Refine your search to only Report
open access

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
open access

Some Lift and Drag Measurements of Two Configurations of a Nacelle and Oil-Cooler Scoop for the Hughes-Kaiser Cargo Airplane

Description: Report presenting tests in the two-dimensional low-turbulence tunnel to determine the drag characteristics of two configurations of a 0.0476-scale nacelle and oil-cooler scoop for the Hughes-Kaiser cargo airplane. The nacelles were found to have a slightly favorable effect on the maximum lift coefficient.
Date: September 1943
Creator: Quinn, John H., Jr.
Item Type: Refine your search to only Report
open access

Some Notes on the Determination of the Stick-Fixed Neutral Point From Wind-Tunnel Data

Description: "Two methods are presented for determining the horizontal location of the stick-fixed neutral point from wind-tunnel data. One method involves the solution of a mathematical equation; whereas the other method is a graphical solution for the same mathematical equation. The combined horizontal and vertical variation of the neutral point completely describes the stick-fixed longitudinal stability of airplanes that have large allowable center-of-gravity shifts" (p. 1).
Date: September 1943
Creator: Schuldenfrei, Marvin
Item Type: Refine your search to only Report
open access

The Strength of Thin-Wall Cylinders of D Cross Section in Combined Pure Bending and Torsion

Description: "The results of tests of 56 cylinders of D cross section conducted in the Aeronautical Laboratory of the University of Maryland are presented in this report. These cylinders were subjected to pure bending and torsional moments of varying proportions to give the strength under combined loading conditions. The average buckling stress of these cylinders has been related to that of circumscribing circular cylinders for conditions of pure torsion and pure bending and the equation of the interaction … more
Date: September 1943
Creator: Sherwood, A. W.
Item Type: Refine your search to only Report
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