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Collection and analysis of wind-tunnel data on the characteristics of isolated tail surfaces with and without end plates

Description: Report presenting the aerodynamic characteristics of 19 isolated tail surfaces, which have been determined by wind tunnel tests. Testing was also made of rectangular airfoils of various aspect ratios with and without double end plates of various shapes. The analysis indicated that the slope of the lift curve could be predicted within 10 percent for all models by use of lifting-surface-theory equations.
Date: May 1947
Creator: Bates, William R.
Partner: UNT Libraries Government Documents Department
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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.
Partner: UNT Libraries Government Documents Department
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Column and Plate Compressive Strengths of Aircraft Structural Materials: Extruded 0-1HTA Magnesium Alloy

Description: Column and plate compressive strengths of extruded 0-1HTA magnesium alloy were determined both within and beyond the elastic range from tests of flat end H-section columns and from 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 aircr… more
Date: January 1947
Creator: Heimerl, George J. & Niles, Donald E.
Partner: UNT Libraries Government Documents Department
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The Combination of Internal-Combustion Engine and Gas Turbine

Description: "While the gas turbine by itself has been applied in particular cases for power generation and is in a state of promising development in this field, it has already met with considerable success in two cases when used as an exhaust turbine in connection with a centrifugal compressor, namely, in the supercharging of combustion engines and in the Velox process, which is of particular application for furnaces. In the present paper the most important possibilities of combining a combustion engine wi… more
Date: April 1947
Creator: Zinner, K.
Partner: UNT Libraries Government Documents Department
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Combustion-efficiency investigation of special fuels in single tubular-type combustor at simulated altitude conditions

Description: Report presenting a combustion-efficiency investigation of 10 special straight-run distillate fuels in an individual tubular-type combustor unit of a 14-unit assembly at two simulated engine operating conditions. These distillates were obtained from various crude oils and consisted of hydrocarbon mixtures with distillations temperature varying from 93 to 690 degrees Fahrenheit. Comparison of temperature measurements obtained from two locations in the exhaust duct showed that under certain opera… more
Date: August 15, 1947
Creator: Dittrich, Ralph T.
Partner: UNT Libraries Government Documents Department
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Comparative Drag Measurements at Transonic Speeds of 6-Percent-Thick Airfoils of Symmetrical Double-Wedge and Circular-Arc Sections From Tests by the NACA Wing-Flow Method

Description: Report presenting comparative drag measurements at zero lift at transonic speeds for two sharp-leading-edge airfoils using the NACA wing-flow method. One airfoil had a symmetrical circular-arc section and one had a symmetrical double-wedge section. The primary difference in the drag characteristics of the two airfoils at zero lift is the earlier drag rise of the double-wedge section.
Date: April 8, 1947
Creator: Silsby, Norman S.
Partner: UNT Libraries Government Documents Department
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Comparative Drag Measurements at Transonic Speeds of an NACA 65-006 Airfoil and a Symmetrical Circular-Arc Airfoil

Description: Report presenting measurements made at transonic speeds by the freely-falling-body method to compare the drag of a rectangular plan-form airfoil of aspect ratio 7.6 with an NACA 65-006 airfoil section. Results regarding the velocity measurements, base-pressure measurements, and airfoil drag measurements are provided.
Date: March 6, 1947
Creator: Thompson, Jim Rogers & Marschner, Bernard W.
Partner: UNT Libraries Government Documents Department
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Comparative performance of two vaneless diffusers designed with different rates of passage curvature for mixed-flow impellers

Description: Report presenting an investigation of the effect of diffuser performance of the passage curvature of two vaneless diffusers designed with a 6 degree equivalent-cone divergence angle along a logarithmic-spiral path in combination with two mixed-flow impellers. The peak of overall adiabatic efficiency is compared with the corresponding diffuser efficiency. Results regarding the variation of diffuser efficiency with load-coefficient parameter and peak overall adiabatic efficiencies and correspondi… more
Date: November 1947
Creator: Barina, Frank J.
Partner: UNT Libraries Government Documents Department
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A comparative study of weights and sizes of flat-plate exhaust-gas-to-air heat exchangers with and without fins

Description: Note presenting analytical comparisons of weights and volumes for flat-plate heat exchangers with the same calculated thermal output and friction pressure drop for three different fin configurations, including no fins, fins in both the air and exhaust gas passages, and fins in the air passages only. Two different heat exchangers were used and compared with predicted weights and volumes.
Date: July 1947
Creator: Tendeland, Thorval & Steinmetz, Charles P.
Partner: UNT Libraries Government Documents Department
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Comparative Tests on Extruded 14S-T and Extruded 24S-T Hat-Shape Stiffener Sections

Description: Note presenting an investigation to compare the 14S-T with 24S-T in extruded stiffeners for stiffened flat sheet panels. The tests were made with stiffened flat sheet panels with three hat-shape stiffeners. Data is provided on the strength of the two alloys as well as the effect of sheet thickness on relative stiffener strengths.
Date: March 1947
Creator: Holt, Marshall & Feil, G. W.
Partner: UNT Libraries Government Documents Department
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Comparison between flight-measured and calculated span load distribution at high Mach numbers

Description: Report presenting an analysis of the spanwise loading using two different methods on the wing of an airplane for which pressure-distribution measurements were available from flight tests up to a Mach number of 0.866. A comparison between measured and calculated distributions was made on the basis of equal wing-panel normal-force coefficients.
Date: November 26, 1947
Creator: Rolls, L. Stewart
Partner: UNT Libraries Government Documents Department
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Comparison between the measured and theoretical span loadings on a moderately swept-forward and a moderately swept-back semispan wing

Description: Report presenting an investigation in the stability tunnel on two semispan swept-wing models to determine experimentally the span-load distributions and to compare the experimental and theoretical results. Lift, drag, pitching moment, and stalling characteristics are provided.
Date: July 1947
Creator: Mendelsohn, Robert A. & Brewer, Jack D.
Partner: UNT Libraries Government Documents Department
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Comparison of Crystal Structures of 10 Wrought Heat Resisting Alloys at Elevated Temperatures With Their Crystal Structures at Room Temperatures

Description: Note presenting an investigation to compare the crystal structure of the predominant phase at temperatures of 1200, 1500, and 1800 degrees Fahrenheit in 10 wrought heat-resisting alloys with crystal structure observed at room temperature. The alloys investigated included S-816, S-590, Hastelloy B, 19-9 W-Mo, N-155, 16-25-6, K-42-B, Inconel X, Nimonic 80, and type 347 stainless steel.
Date: November 1947
Creator: Kittel, J. Howard
Partner: UNT Libraries Government Documents Department
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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.
Partner: UNT Libraries Government Documents Department
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A comparison of flight test results on a scout-bomber airplane with 4.7 degree and with 10 degree geometric dihedral in the wing outer panels

Description: Report presenting a flight investigation of a scout-bomber airplane with 4.7 degrees and 10 degree geometric dihedral in the wing outer panels in order to obtain flight test results pertaining to the upper limit of the wing-dihedral angle for satisfactory handling qualities. No unusual or undesirable lateral control characteristics were observed with the combinations of stability parameters obtained with the two dihedral angles used.
Date: August 1947
Creator: Forsyth, Charles M. & Gray, William E., Jr.
Partner: UNT Libraries Government Documents Department
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Comparison of the control-force characteristics of two types of lateral-control system for large airplanes

Description: Report presenting an analysis of wind-tunnel data for two types of lateral-control system for large airplanes in order to determine the control-force characteristics and rolling effectiveness of each system. The two types of control systems explored are a spring-tab aileron and a combination spoiler and guide or pilot-aileron arrangement.
Date: September 1947
Creator: Deters, Owen J.
Partner: UNT Libraries Government Documents Department
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A Comparison of the Lateral Motion Calculated for Tailless and Conventional Airplanes

Description: Theoretical analysts of lateral dynamic motion of tailless and conventional airplanes was made for fighter and heavy transport. Their reactions to a lateral gust and control power required by each for simple maneuvers were determined and compared. Both types of airplanes require almost identical aileron control power to perform a given maneuver; tailless airplane requires about 1-2 to 1-3 directional control power of conventional airplane. Tailless airplane also shows greatest displacement for … more
Date: February 1947
Creator: Harper, Charles W. & Jones, Arthur L.
Partner: UNT Libraries Government Documents Department
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Comparison of the transonic drag characteristics of two wing-body combinations differing only in the location of the 45 degree sweptback wing

Description: Report presenting the drag of a series of wing-body combinations by the free-fall method in order to provide information on the drag characteristics of promising transonic and supersonic airplane arrangements. Time histories, Mach number variations, and drag coefficients for several areas of the body are provided.
Date: December 8, 1947
Creator: Mathews, Charles W. & Thompson, Jim Rogers
Partner: UNT Libraries Government Documents Department
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A comparison of three theoretical methods of calculating span load distribution on swept wings

Description: Report presenting the application of three methods for calculating span load distribution for five swept wings. The methods were examined to establish their relative accuracy and ease of application. While the Weissinger and Falkner methods were more useful for certain circumstances, there were no advantages noted with the Mutterperl method.
Date: November 1947
Creator: Van Dorn, Nicholas H. & DeYoung, John
Partner: UNT Libraries Government Documents Department
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A comparison of three theoretical methods of calculating span load distribution on swept wings

Description: From Summary: "Three methods for calculating span load distribution, those developed by V.M Falkner, Wm. Mutterperl, and J. Weissinger, have been applied to five swept wings. The angles of sweep ranged from -45 degrees to +45 degrees. These methods were examined to establish their relative accuracy and case of application. Experimentally determined loadings were used as a basis for judging accuracy. For the convenience of the readers the computing forms and all information requisite to their ap… more
Date: June 9, 1947
Creator: Van Dorn, Nicholas H. & DeYoung, John
Partner: UNT Libraries Government Documents Department
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Comparison of Wind-Tunnel Predictions with Flight Measurements of the Longitudinal-Stability and -Control Characteristics of a Douglas BTD-1 Airplane

Description: "Low Mach number longitudinal-stability and control characteristics as predicted by use of wind tunnel data from a powered 3/16-scale model are compared with flight test measurements of a Navy BTD-1 airplane. The accuracy of the wind tunnel data and the discrepancies involved in attempting to correlate with flight data are discussed and analyzed. The comparison showed that wind tunnel predictions were, in general, in good agreement with flight test data" (p. 1).
Date: February 13, 1947
Creator: Bunnell, Mort V. & Delany, Noel K.
Partner: UNT Libraries Government Documents Department
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A comparison with flight data of vertical-tail loads in various maneuvers estimated from sideslip angles and rudder deflections

Description: Report presenting a comparison of the vertical-tail loads determined from pressure-distribution measurements in flight in various maneuvers with the corresponding vertical-tail loads. Some of the maneuvers investigated included slow rolls, steady sideslips, fishtails, and rolling pull-outs.
Date: December 11, 1947
Creator: Turner, Howard L.
Partner: UNT Libraries Government Documents Department
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