UNT Libraries Government Documents Department - 423 Matching Results

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Investigation of Effects of Various Camouflage Paints and Painting Procedures on the Drag Characteristics of an NACA 65(Sub 421)-420, a = 1.0 Airfoil Section

Description: Bulletin presenting an investigation of the effects of various camouflage paints and painting procedures on the drag characteristics of a 60-inch-chord low-drag airfoil in the NACA two-dimensional low-turbulence pressure tunnel.
Date: July 1944
Creator: Braslow, Albert L.
Item Type: Refine your search to only Report
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Flight Investigation of Boundary-Layer Control by Suction Slots on an NACA 35-215 Low-Drag Airfoil at High Reynolds Numbers

Description: Report presenting an investigation of the effectiveness of suction slots as a means of extending the laminar boundary layer in flight at high Reynolds numbers on an NACA 35-215 airfoil. The results showed that, with a slot spacing of about 5 percent of the chord, the laminar boundary layer could be maintained to or slightly beyond 45 percent of the chord.
Date: February 1944
Creator: Zalovcik, John A.; Wetmore, J. W. & von Doenhoff, Albert E.
Item Type: Refine your search to only Report
open access

Power-Off Tests of the Northrop N9M-2 Tailless Airplane in the 40- by 80-Foot Wind Tunnel

Description: Report discussing tests on the N9M-2 airplane to evaluate the airplane efficiency factor and to investigate the characteristics of the aeroboost in the elevon control system. The efficiency factor compared reasonably well to conventional airplanes and the aeroboost system and valve-chatter tests were satisfactory.
Date: December 14, 1944
Creator: Stevens, Victor I., Jr. & McCormack, Gerald M.
Item Type: Refine your search to only Report
open access

Flight Tests of the High-Speed Performance of a P-51B Airplane (AAF No. 43-12105)

Description: Report discussing testing to check the improvement of 3 or 4 miles per hour in the maximum speed of the P-51B airplane as a result of sealing the wing-gun access doors and flap-spar lightening holes. Large variations in speed were observed during testing, so additional testing and analysis was carried out to determine the effects of various factors that were suspected of contributing to the inconsistency of the plane's performance.
Date: December 18, 1944
Creator: Voglewede, T. J. & Danforth, E. C. B.
Item Type: Refine your search to only Report
open access

Analysis of Circular Shell-Supported Frames

Description: From Summary: "This paper deals with the single problem if circular shell-supported frames subjected to concentrated loadings. A mathematical attack is developed and presented in the form of nondimensional-coefficient curves."
Date: May 1944
Creator: Wignot, J. E.; Combs, Henry & Ensrud, A. F.
Item Type: Refine your search to only Report
open access

Investigation of the Behavior of Parallel Two-Dimensional Air Jets

Description: Report presenting an investigation made of the flow downstream from a two-dimensional grid, formed of parallel rods. The two-dimensional character of the flow was insured by end plates normal to the rods and covering the entire flow field. The nature of the flow was determined primarily by means of total-head measurements.
Date: November 1944
Creator: Corrsin, Stanley
Item Type: Refine your search to only Report
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Elastic properties of channels with unflanged lightening holes

Description: Report presenting testing of fifty-eight lightened and five unlightened aluminum-alloy channels as simply supported beams in pure or simple bending produced by loads parallel to the plane of symmetry, and fifty-three lightened and four unlightened aluminum-alloy channels with loads parallel to the back. Four types of testing occurred with various types of support and loading.
Date: March 1944
Creator: Niles, Alfred S.
Item Type: Refine your search to only Report
open access

A Least-Squares Procedure for the Solution of the Lifting-Line Integral Equation

Description: Note presenting a least-squares procedure adapted to numerical calculation for the approximate solution of the Prandtl lifting-line equation. Sufficient data are tabulated to permit a solution of the equation by purely numerical methods for an arbitrary symmetrical variation of the chord and the angle of attack.
Date: February 1944
Creator: Hildebrand, Francis B.
Item Type: Refine your search to only Report
open access

Ovalization of Tubes Under Bending and Compression

Description: "An empirical equation has been developed that gives the approximate amount of ovalization for tubes under bending loads. Tests were made on tubes in the d/t range from 6 to 14, the latter d/t ratio being in the normal landing gear range. Within the range of the series of tests conducted, the increase in ovalization due to a compression load in combination with a bending load was very small" (p. 1).
Date: March 1944
Creator: Demer, L. J. & Kavanaugh, E. S.
Item Type: Refine your search to only Report
open access

Piloting of flying boats with special reference to porpoising and skipping

Description: From Summary: "The various types of hydrodynamic instability - including porpoising, skipping, and yawing - that may be encountered during take-off or landing of a flying boat are described and the piloting technique required for efficient take-offs and landings is discussed. Suggestions are made for assisting a pilot to become familiar with the take-off and landing qualities of a flying boat that is new to him."
Date: February 1944
Creator: Benson, James M.
Item Type: Refine your search to only Report
open access

Numerical procedures for the calculation of the stresses in monocoques 2: diffusion of tensiles stringer loads in reinforced flat panels with cut-outs

Description: Report presenting experiments with a flat reinforced sheet model, the longitudinals of which were loaded axially. Two groups of sheets, one with one panel and one with two panels, were cut out and the stress distributions in stringers and sheet was measured with electric strain gages.
Date: November 1944
Creator: Hoff, N. J. & Kempner, Joseph
Item Type: Refine your search to only Report
open access

Performance tests of wire strain gages 1: calibration factors in tension

Description: Report presenting calibrations in axial tension over the strain range from 0 to 0.0024 are presented for 15 types of single element multistrand wire strain gages. The majority of the gages showed significant differences between the calibration factors for strain increasing and strain decreasing. Improvement in gage performance after preloading was apparent in most cases.
Date: November 1944
Creator: Campbell, William R.
Item Type: Refine your search to only Report
open access

A unit laboratory engine oil system providing for a remote indication of oil flow and oil consumption together with blow-by measurement

Description: From Summary: "A unit oil system and oil-weighing device designed for laboratory engine tests to permit the remote measurement of oil-flow rate and oil consumption is described. The system regulates the oil pressure and temperature and is closed to make possible the accurate measurement of blow-by gas. The oil is weighed by a self-contained diaphragm and pilot-valve assembly, which uses compressed air as the transmitting medium. Several of those unit systems have given satisfactory service for … more
Date: September 1944
Creator: Koffel, William K. & Biermann, Arnold E.
Item Type: Refine your search to only Report
open access

Axial Fatigue of 10 Airplane Wing-Beam Specimens by the Resonance Method

Description: Note presenting axial fatigue tests made by the resonance method on 10 specimens from airplane wing beams. The specimens contained several types of stress raiser, such as rivets, holes, fittings, splices, reinforcing plates, and so forth. The results show a greater fatigue stress concentration factor for the wing-beam specimens than for drilled coupons machined from the flanges or for parallel strip coupons containing idle rivets.
Date: December 1944
Creator: Brueggeman, W. C.; Krupen, P. & Roop, F. C.
Item Type: Refine your search to only Report
open access

Applicability of Similarity Principles to Structural Models

Description: "A systematic account is given in part I of the use of dimensional analysis in constructing similarity conditions for models and structures. The analysis covers large deflections, buckling, plastic behavior, and materials with nonlinear stress-strain characteristics, as well as the simpler structural problems" (p. 1).
Date: July 1944
Creator: Goodier, J. N. & Thomson, W. T.
Item Type: Refine your search to only Report
open access

Plastic Mountings for Aircraft Windshields

Description: Note presenting an investigation of several laminated glass windshields to determine their suitability for use in airplanes with pressurized cabins. The various constructions of the extended portions of the windshields which serve for mounting purposes included plastic alone, plastic and one sheet of glass extended, plastic extension reinforced with an aluminum strip, and plastic extension reinforced with a steel strip. The results indicated that the laminated windshields with plastic-mounting … more
Date: May 1944
Creator: Bradley, Kathryn H. & Axilrod, B. M.
Item Type: Refine your search to only Report
open access

Simplified Truss Stability Criteria

Description: Report presenting a note in two parts regarding simplified truss stability criteria. The first part covers the development of simplified criteria for the stability of planar pin-jointed trusses against buckling in the plane of the truss. The second part constitutes a report on tests carried out to verify the validity of the criteria developed in part one.
Date: July 1944
Creator: Ballhaus, W. F. & Niles, A. S.
Item Type: Refine your search to only Report
open access

Charts for rapid analysis of 45 degree strain-rosette data

Description: From Summary: "Charts are presented for rapidly determining the principal strains and stresses, the maximum shear strain and stress, and the orientation of principal axes from data on 45 degree strain rosettes. The charts may be used for analyzing the conventional data consisting of strains measured along three gage lines 45 degrees apart, but their application is more direct if the rosette data are obtained by means of special circuits that require the use of four gages 45 degrees apart."
Date: May 1944
Creator: Manson, S. S.
Item Type: Refine your search to only Report
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