National Advisory Committee for Aeronautics (NACA) - 29 Matching Results

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Aerodynamic Characteristics of Four Republic Airfoil Sections from Tests in Langley Two-Dimensional Low-Turbulence Tunnels

Description: "Four airfoils sections, designed by the Republic Aviation Corporation for the root and tip sections of the XF-12 airplane, were tested in the Langley two-dimensional low-turbulence tunnels to obtain their aerodynamic characteristics. Lift characteristics were obtained at Reynolds numbers of 3,000,000, 6,000,000, 9,000,000, and 14,000,000, whereas drag characteristics were obtained at Reynolds numbers of 3,000,000, 6,000,000, and 9,000,000. Pressure distributions were obtained for one of the ro… more
Date: September 27, 1945
Creator: Klein, Milton M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Approximate Determination of the Power Required to Move Control Surfaces as Related to Control-Booster Design

Description: "As a part of a general investigation of control boosters, preliminary calculations were made to indicate the sizes of control boosters necessary to move the controls of airplanes of various sizes. The analysis was based on the assumption that the controls were moved with a rapidity and amplitude equal to that measured with a fighter airplane in simulated combat. A corollary purpose consisted in determining the effect on reducing booster-power unit size of incorporating an energy accumulator in… more
Date: September 1945
Creator: Johnson, Harold I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Bibliography and Review of Information Relating to the Hydrodynamics of Seaplanes

Description: Report presenting a bibliography and review of information related to the hydrodynamics of seaplanes. Characteristics of conventional hulls and floats are discussed to show the effects upon performance of changes in design parameters like dead rise, depth of step, and angle of afterbody keel. Other topics include floats, lateral stabilizers, aerodynamic and propulsive considerations, unconventional configurations, hydrofoils, and piloting and handling.
Date: September 1945
Creator: Benson, James M. & Bidwell, Jerold M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Calculation of the Aileron and Elevator Stick Forces and Rudder Pedal Forces for the Bell XP-83 Airplane (Project MX-511) in Spins

Description: "Aileron and elevator stick forces and rudder pedal forces for the Bell XP-83 airplane in spins have been calculated. The results indicate that the aileron and elevator stick forces may be excessive unless some suitable booster or more highly balanced control surfaces are used. The pilot will be able to move the surfaces only slightly from their normal floating locations" (p. 1).
Date: September 1945
Creator: Stone, Ralph W., Jr. & Schneiter, Leslie E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Calculation of Turbulent Expansion Processes

Description: "On the basis of certain formulas recently established by L. Prandtl for the turbulent interchange of momentum in stationary flows, various cases of "free turbulence" - that is, of flows without boundary walls - are treated in the present report. Prandtl puts the apparent shearing stress introduced by the turbulent momentum interchange. This present report deals first with the mixing of an air stream of uniform velocity with the adjacent still air, than with the expansion or diffusion of an air… more
Date: September 1945
Creator: Tollmien, Walter
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Charts for Determining Jet-Boundary Corrections for Complete Models in 7- by 10-Foot Closed Rectangular Wind Tunnels

Description: Report presenting calculations of numerical values of the jet-boundary corrections to the angle of attack and the induced-drag, rolling-moment, and yawing-moment coefficients for complete airplane or wing models in 7- by 10-foot closed rectangular wind tunnels. The results showed that the wing area was the most important variable, as has usually been assumed in previous calculations. When the corrections were based on wing area, the effect of most of the other variables was negligible.
Date: September 1945
Creator: Gillis, Clarence L.; Polhamus, Edward C. & Gray, Joseph L., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Cooling of Gas Turbines, 2, Effectiveness of Rim Cooling of Blades

Description: An analysis of rim cooling, which cools the blade by condition alone, was conducted. Gas temperatures ranged from 1300 degrees to 1900 degrees F and rim temperatures from 0 degrees to 1000 degrees F below gas temperatures. Results show that gas temperature increases up to 200 degrees F are permissible provided that the blades are cooled by 400 degrees to 500 degrees F below the gas temperature. Relatively small amounts of blade cooling, at constant gas temperature, give large increases in blade… more
Date: September 20, 1945
Creator: Wolfenstein, Lincoln; Meyer, Gene L. & McCarthy, John S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Effect of Carburetor-Air Temperature on the Cooling Characteristics of a Typical Air-Cooled Engine Cylinder

Description: Report presenting an investigation that was conducted to determine the effect of carburetor dry-air temperature on the cooling characteristics of a typical full-scale air-cooled engine cylinder mounted on a single-cylinder crankcase.
Date: September 1945
Creator: Neustein, Joseph; Sens, William H. & Buckner, Howard A., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Effect of Carburetor Throttle Settings on the Velocity Distribution at the Outlet of a Vaned and Vaneless Supercharger Inlet Elbow

Description: Report presenting a study to determine the effect of a carburetor and an inlet elbow on the flow at the supercharger impeller inlet. Tests were conducted on a commercial vaned supercharger inlet-elbow assembly to determine the effect on the velocity distribution at the elbow outlet. Results indicated that the velocity profile obtained at the outlet of the vaneless elbow was better than that with the vaned elbow at all throttle settings.
Date: September 1945
Creator: Guentert, Donald C. & Baas, Edmund J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Effect of High-Resistance Ignition Cable on the Erosion of Spark-Plug Electrodes

Description: Report discussing testing to determine the effects that using high-resistance ignition cable has on erosion of spark-plug electrodes. Erosion was found to be reduce about 70 percent when high-resistance ignition cable was used in place of standard cable.
Date: September 1945
Creator: Swett, Clyde C., Jr. & Rodgers, Franklin A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Effect of Inlet Temperature and Pressure on the Efficiency of Single-Stage Impulse Turbine Having a 13.2-Inch Pitch-Line Diameter Wheel

Description: From Summary: "Efficiency tests have been conducted on a single-stage impulse turbine having a 13.2-inch pitch-line diameter wheel and a cast nozzle diaphragm over a range of turbine speeds from 3000 to 17,000 rpm, pressure ratios from 1.5 to 5.0, inlet total temperatures from 1200 deg to 2000 deg R, and inlet total pressures from 18 to 59 inches of mercury absolute. The effect of inlet temperature and pressure on turbine efficiency for constant pressure ration and blade-to-jet speed ration is … more
Date: September 1945
Creator: Chanes, Ernest R. & Carman, L. Robert
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effect of Maximum Cruise-Power Operation at Ultra-Lean Mixture and Increased Spark Advance on the Mechanical Condition of Cylinder Components

Description: "A continuous 50-hour test was conducted to determine the effect of maximum cruise-power operation at ultra-lean fuel-air mixture and increased spark advance on the mechanical conditions of cylinder components. The test was conducted on a nine-cylinder air-cooled radial engine at the following conditions:brake horsepower, 750; engine speed, 1900 rpm; brake mean effective pressure, 172 pounds per square inch; fuel-air ratio, 0.052; spark advance, 30 deg B.T.C.; and maximum rear-spark-plug-bushin… more
Date: September 27, 1945
Creator: Harris, Herbert B.; Duffy, Robert T. & Erwin, Robert D., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effect of Wing Modifications on the Longitudinal Stability of a Tailless All-Wing Airplane Model

Description: Report presenting an investigation of the power-off longitudinal stability characteristics of a tailless all-wing airplane model with various wing modifications in the free-flight tunnel. The results indicated that changes in the tip plan form or rotation of the wing tips did not appreciably reduce the instability at high lift coefficients.
Date: September 1945
Creator: Seacord, Charles L., Jr. & Ankenbruck, Herman O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Impact Properties at Different Temperatures of Flush-Riveted Joints for Aircraft Manufactured by Various Riveting Methods

Description: Report presenting the results of an investigation to determine the impact properties of flush-riveted joints manufactured by different riveting methods. Testing occurred on a pendulum impact machine at temperatures of 70, -50, and -70 degrees Fahrenheit using rivets made of aluminum alloy A17S-T and plates of aluminum alloy 24S-T.
Date: September 1945
Creator: Maney, G. A. & Wyly, L. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An investigation of a thermal ice-prevention system for a C-46 cargo airplane 7: Effect of the thermal system on the wing-structure stresses as established in flight

Description: Report presenting an investigation of a thermal ice-prevention system for a Curtiss-Wright C-46 airplane, which included a determination of the change in stress at various locations in the wing outer panel caused by operation of the thermal system. Curves are presented showing the chordwise variation of stress and temperature for two wing stations.
Date: September 1945
Creator: Jones, Alun R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Kinetic Temperature of Wet Surfaces: A Method of Calculating the Amount of Alcohol Required to Prevent Ice, and the Derivation of the Psychometric Equation

Description: Report presenting a method for calculating the temperature of a surface wetted either by a pure liquid, such as water, or by a mixture, such as alcohol and water. The method is applied to the problem of protecting, by alcohol, propellers and the induction system of the engine against ice. The psychrometric equation, used in wet-bulb hygrometry, is deduced in its general form.
Date: September 1945
Creator: Hardy, J. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Method for Determining Oil-Cooler Performance Requirements in Series Operation

Description: Report presenting an equation by which the overall performance of any number of oil coolers when operating in series can be related to their performance when operating singly. A comparison was made of the experimental overall performance of two conventional type 15-inch-diameter oil coolers, selected according to the analysis and equipped first with spring-loaded valves and then with rotary valves, with the desired overall performance.
Date: September 1945
Creator: Boyet, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Nondestructive Measurement of Residual and Enforced Stresses by Means of X-Ray Diffraction 1: Correlated Abstract of the Literature

Description: Note presenting a study of the stress measurements by means of the x-ray diffraction method, which have found considerable application in solving both commercial and laboratory problems. Two problems related to x-ray diffraction are studied and a literature review is conducted.
Date: September 1945
Creator: Sachs, George; Smith, Charles S.; Lubahn, Jack D.; Davis, Gordon E. & Ebert, Lynn J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Numerical Evaluation by Harmonic Analysis of the (Epsilon)-Function of the Theodorsen Arbitrary-Airfoil Potential Theory

Description: Finite trigonometric series is fitted by harmonic analysis as an approximation function to the psi function of the Theodorsen arbitrary-airfoil potential theory. By harmonic synthesis, the corresponding conjugate trigonometric series is used as an approximation to the epsilon function. A set of coefficients of particularly simple form is obtained algebraically for direct calculation of the epsilon values from the corresponding set of psi values.
Date: September 1945
Creator: Naiman, Irven
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Performance of a Single-Stage Impulse Turbine Having an 11.0-Inch Pitch-Line Diameter Wheel with Cast Airfoil-Shaped and Bent Sheet-Metal Nozzle Blades

Description: Report presenting efficiency tests on a single-stage gas turbine with an 11.0-inch pitch-line diameter wheel and a nozzle diaphragm with cast airfoil-shaped nozzle blades using atmospheric air as the driving fluid. A comparison is made with the same turbine but with different nozzle blades. Results regarding the efficiency curves and further information about velocity effects are provided.
Date: September 1945
Creator: Gabriel, David S. & Carman, L. Robert
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Performance tests of wire strain gages 2: calibration factors in compression

Description: Report presenting the results of calibrations in axial compression over the strain range 0 to 0.0021 for 15 types of single element multistrand wire strain gages. The majority of gages showed significant differences between the calibration factors for strain increasing and strain decreasing. The majority of the gages were found to have slightly lower factors in compression than in tension.
Date: September 1945
Creator: Campbell, William R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Properties of some expanded plastics and other low-density materials

Description: Report presenting an investigation of various mechanical and physical properties of several expanded plastics and other low-density materials of interest for aircraft applications, such as heat insulation or the core of a sandwich material. The materials in the investigation included cellulose acetate plastic, polystyrene, a urea-formaldehyde resin, a zein product, hard rubber, balsa wood, and cellular glass.
Date: September 1945
Creator: Axilrod, Benjamin M. & Koenig, Evelyn
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Resistance Tests of Models of Three Flying-Boat Hulls With a Length-Beam Ratio of 10.5

Description: Report presenting testing of models of three flying-boat hulls with a length-beam ratio of 10.5. Testing occurred at two depths of step and two angles of dead rise. Results regarding resistance, trimming-moment, and wetted-length data for general fixed-trim and free-to-trim tests at load coefficients up to 4.0 are provided.
Date: September 1945
Creator: Bidwell, Jerold M. & Goldenbaum, David M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Some Basic Laws of Isotropic Turbulent Flow

Description: An Investigation is made of the diffusion of artificially produced turbulence behind screens or other turbulence producers. The method is based on the author's concept of disturbance moment as a certain theoretically well-founded measure of turbulent disturbances.
Date: September 1945
Creator: Loitsianskii, L. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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