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open access

Diseases of raspberries and blackberries.

Description: Describes the characteristics of diseases that infect raspberries and blackberries as well as their respective treatments.
Date: September 1941
Creator: Dodge, B. O. (Bernard Ogilvie), 1872-1960.; Wilcox, R. B. (Raymond Boorman), 1889-1949. & Demaree, J. B. (Juan Brewer), 1885-
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department
open access

Wind-Tunnel Investigation of Control-Surface Characteristics 4: A Medium Aerodynamic Balance of Various Nose Shapes Used With a 30-Percent-Chord Flap on an NACA 0009 Airfoil

Description: Report presenting tests made in the 4- by 6-foot vertical wind tunnel of an NACA 0009 airfoil with a 30-percent-chord flap with a medium amount of aerodynamic overhanging balance. In this investigation, the effects of the shape of the flap-nose overhang and the gap at the nose of the flap have been determined. The results indicate that, generally, the lift effectiveness of the aerodynamically balanced flap was increased slightly over that of a plain flap when a blunt or medium flap nose was use… more
Date: September 1941
Creator: Ames, Milton B., Jr. & Eastman, Donald R., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Minimum Induced Drag in Wing-Fuselage Interference

Description: Note presenting a method for obtaining the minimum induced drag of airfoils in the proximity of ideal internal boundaries. The theorem is applied to the case of an ideal wing-fuselage combination consisting of a lifting line intersecting an infinitely long circular cylindrical fuselage to determine the effect of wing height on the minimum induced drag. The analysis used can be modified for combinations with different fuselage cross sections.
Date: September 1941
Creator: Pepper, Perry A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Wind-tunnel investigation of effect of yaw on lateral-stability characteristics 3: symmetrically tapered wing at various positions on circular fuselage with and without a vertical tail

Description: Report presenting testing of model combinations of an NACA 23012 tapered wing and a circular fuselage to determine the effect of longitudinal wing position on the change in lateral stability due to interference. Results regarding wing-fuselage interference and effect of wing-fuselage interference on vertical tail are provided.
Date: September 1941
Creator: Recant, Isidore G. & Wallace, Arthur R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Variation of Properties Throughout Cross Section of Two Extruded Shapes

Description: "Tensile and compressive properties were determined of specimens cut from the fins and the main bodies of two different extruded shapes of 24S-T aluminum alloy. The specimens from the fins as compared with those from the main body of the section showed: tensile strengths from 5000 to 10,000 pounds per square inch lower; tensile yield strengths and compressive yield strengths 4000 to 9000 pounds per square inch lower. The compressive yield strength values for any given location in the cross sect… more
Date: September 1941
Creator: Howell, F. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analytical Determination of Control System Pulley-Axis Angles

Description: From Introduction: "The ideas developed in this paper are presented as a means of saving the designer's time and as a method of reduction of control-system friction by an accurate calculation of pulley-axis angles without the errors and difficult checking incident to any graphical method."
Date: September 1941
Creator: Driggs, I. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

On the Use of Residue Theory for Treating the Subsonic Flow of a Compressible Fluid

Description: "A new mathematical technique, due to Milne-Thomson, is used to obtain an improved form of the method of Poggi for calculating the effect of compressibility on the subsonic flow past an obstacle. By means of this new method, the difficult surface integrals of the original Poggi method can be replaced by line integrals. These line integrals are then solved by the use of residue theory. In this way an equation is obtained giving the second-order effect of compressibility on the velocity of the fl… more
Date: September 8, 1941
Creator: Kaplan, Carl
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Test of single-stage axial-flow fan

Description: "A single-stage axial fan was built and tested in the shop of the propeller-research tunnel of the NACA. The fan comprised a simple 24-blade rotor having a diameter of 21 inches and a solidity of 0.86 and a set of 37 contravanes having a solidity of 1.33. The rotor was driven by a 25-horsepower motor capable of rotating at a speed of 3600 r.p.m. The fan was tested for volume, pressure, and efficiency over a range of delivery pressures and volumes for a wide range of contravane and blade-angle s… more
Date: September 22, 1941
Creator: Bell, E. Barton
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Wind-Tunnel Investigation of an NACA 23012 Airfoil With 30 Percent-Chord Venetian-Blind Flaps

Description: Report presents the results of an investigation made in the NACA 7 by 10-foot wind tunnel of a NACA 23012 airfoil with 30-percent-chord venetian-blind flaps having one, two, three, and four slats of Clark y section. The three-slat arrangements was aerodynamically the best of those tested but showed practically no improvement over the comparable arrangement used in the preliminary tests published in NACA Technical Report No. 689. The multiple-slat flaps gave slightly higher lift coefficients tha… more
Date: September 17, 1941
Creator: Rogallo, F. M. & Spano, Bartholomew S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Plate method of ground representation for wind-tunnel determination of elevator effectiveness in landing

Description: Report presenting an investigation in the wind tunnel to determine the validity of the stationary-plate method of ground representation for tests of ground effect on the pitching moment of complete airplane models. Results regarding the elevator deflection for landing, effect of ground on pitching-moment coefficient, angles at the tail, and effect of ground on maximum lift are provided.
Date: September 1941
Creator: Recant, I. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Tests of Bell XP-63 Low-Drag Wing Model With Split Flap

Description: Report presenting tests on the Bell XP-63 wing root section fitted with an 0.18c split flap hinged at approximately 0.805c on the lower surface. The tests were conducted to determine the effect of a 10 degree deflection of the split flap on the drag characteristics of the model at low lift coefficients.
Date: September 1941
Creator: Underwood, W. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Dynamic stress calculations for two airplanes in various gusts

Description: Report presenting a series of calculations made to determine the probable dynamic wing stress of two large airplanes in atmospheric gusts. The results indicate that in both isolated and repeated gusts of probable occurrence, the dynamic overstress is about 10 percent when referred to the present static design standard.
Date: September 1941
Creator: Pierce, Harold B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Heat treating and inspection of metals

Description: This report discusses these topics: I. Principles of heat treating -- II. Heat-treating equipment -- III. General heat treatment of steel -- IV. Specific heat treatments for aircraft steels -- V. General heat treatment of aluminum alloys -- VII. Hardness testing -- VIII. Magnaflux inspection.
Date: September 10, 1941
Creator: United States. War Department.
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department
transcript

Clifton Utley, September 12, 1941; Elmer Davis and the News

Description: Track 1 contains Clifton Utley reading the news, sponsored by Skelly Oil, a day after President Franklin Delano Roosevelt's speech on freedom of the seas. Utley is followed by local programing from Oklahoma City station WKY, with reference to a WKY listening post for German shortwave radio. Track 2 contains a weekly summary of news from CBS, followed by Elmer Davis and the News, which was broadcast locally in Oklahoma City on KOMA. This recording appears to have been copied from a tape, and art… more
Date: 1941-09~
Duration: 34 minutes 52 seconds
Creator: Utley, Clifton M. (Clifton Maxwell), 1904-1978 & Davis, Elmer, 1890-1958
Item Type: Refine your search to only Sound
Partner: UNT Music Library
open access

Critical Speeds and Profile Drag of the Inboard Sections of a Conventional Propeller

Description: Report presenting the section critical speeds and profile drags of the shank and hub sections of a propeller used on a current liquid-cooled-engine pursuit type of airplane. Results indicated that serious adverse compressibility effects can be expected at speeds of about 400 miles per hour. Suitable fairings for shank and hub sections were found to be necessary for maximum propulsive efficiency.
Date: September 1941
Creator: Luoma, Arvo A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Observations of the Effect of Wing Appendages and Flaps on the Spread of Separation of Flow Over the Wing

Description: "The spread of the separation of flow on three tapered wings insymmetrical and unsymmetrical flow was observed with silk tufts. By equal thickness and chord distribution the wings manifested a different form of lifting line. The principal result of the study was that the wings alone first disclosed complete breakdown of the flow at the tips, even the one with twist, but that after adding fuselage and engine nacelles, the twisted wing broke down completely first in the wing center" (p. 1).
Date: September 1941
Creator: Hartwig, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Factors Influencing the Fatigue Strength of Materials

Description: "A number of factors are considered which influence the static and fatigue strength of materials under practical operating conditions as contrasted with the relations obtaining under conditions of the usual testing procedure. Such factors are interruptions in operation, periodically fluctuating stress limits and mean stresses with periodic succession of several groups and stress states, statistical changes and succession of stress limits and mean stresses, frictional corrosion at junctures, and… more
Date: September 1941
Creator: Bollenrath, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

New Frictional Resistance Law for Smooth Plates

Description: From measurements in the free boundary layer of a plate the laws governing the velocity distribution and a new resistance law are derived which, by increasing Reynolds number Re(sub x) afford lower resistance values than the logarithmic law. The transverse velocities, the shearing stress, and the mixing path profiles were also defined.
Date: September 1941
Creator: Schultz-Grunow, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Mechanical Properties of Wood of Different Moisture Content Within -200 Degrees to +200 Degrees C Temperature Range

Description: Systematic experiments were undertaken with special reference to the effect of gross specific weight (specific weight inclusive of pores) and the moisture content of wood. It was found that the modules of elasticity of wood at room temperature and frozen at -8 degrees is practically the same. The effect of moisture on the compression strength of frozen wood was explored as well as the flexural and impact strength of frozen wood and frozen laminated wood.
Date: September 1941
Creator: Kollmann, Franz
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Combined Beam-Column Stresses of Aluminum-Alloy Channel Sections

Description: "The results of tests of 65 specimens of aluminum-alloy channel sections are graphed for stresses due to axial and bending loads as functions of the ratio of length of specimen to its radius of gyration, and from these data a suggested design chart is derived that is suitable for ready use" (p. 1).
Date: September 1941
Creator: Hutton, J. O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Wind-Tunnel Investigation of an NACA 66,2-216 Low-Drag Wing with Split Flaps of Various Sizes, Special Report

Description: "An investigation was conducted in the NACA 19-foot pressure wind tunnel of a rectangular wing having NACA 66, 2-216 low-drag airfoil sections and various sizes of simple split flaps. The purpose of the investigation was, primarily, to determine the influence of these flap installations on the aerodynamic characteristics of the wing. Complete lift, drag, and pitching-moment characteristics were determined for a range of test Reynolds numbers from about 2,600,000 to 4,600,000 for each of the ins… more
Date: September 1941
Creator: Muse, Thomas C. & Neely, Robert H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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