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Results 15361 - 15370 of 18,906
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Heat transfer tests of a steel cylinder barrel with aluminum fins with improved bonding between steel barrel and aluminum base

Heat transfer tests of a steel cylinder barrel with aluminum fins with improved bonding between steel barrel and aluminum base

Date: July 1, 1940
Creator: Ellerbrock, Herman H , Jr
Description: None
Contributing Partner: UNT Libraries Government Documents Department
New equipment for testing the fatigue strength of riveted and welded joints

New equipment for testing the fatigue strength of riveted and welded joints

Date: July 1, 1940
Creator: Muller, W
Description: The mechanical and electrical construction of a new experimental instrument for fatigue testing riveted and welded joints is described. This experimental device has the advantage of being able to stress, even with comparatively low magnetic exciter force, structural components in alternate bending by resonance vibrations up to incipient fatigue failure.
Contributing Partner: UNT Libraries Government Documents Department
Requirements for unit fuel-injection systems

Requirements for unit fuel-injection systems

Date: July 1, 1940
Creator: Marsh, Edred T
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Spin tests of a low-lying monoplane in flight and in the free-spinning wind tunnel

Spin tests of a low-lying monoplane in flight and in the free-spinning wind tunnel

Date: July 1, 1940
Creator: Seidman, Oscar & Mcavoy, William H
Description: Comparative full-scale and model spin tests were made with a low-lying monoplane in order to extend the available information as to the utility of the free-spinning wind tunnel as an aid in predicting full-scale spin characteristics. For a given control disposition the model indicated steeper spins than were actually obtained with the airplane, the difference being most pronounced for spins with elevators up. Recovery characteristics for the model, on the whole, agreed with those for the airplane, but a disagreement was noted for the case of recovery with elevators held full up. Free-spinning wind-tunnel tests are a useful aid in estimating spin characteristics of airplanes, but it must be appreciated that model results can give only general indications of full-scale behavior.
Contributing Partner: UNT Libraries Government Documents Department
A study of the air movement in two aircraft-engine cylinders

A study of the air movement in two aircraft-engine cylinders

Date: July 1, 1940
Creator: Lee, Dana W
Description: Studies were made of the air movements in the NACA glass-cylinder apparatus using cylinder heads similar to those on the Wright R-1820-G engine and the Pratt & Whitney Wasp engine as modified by the Eclipse Aviation Corporation to use fuel-injection equipment. The air movements were made visible by mixing small feathers with the air; high-speed motion pictures were than taken of the feathers as they swirled about the inside the glass cylinder. The test engine speeds were 350, 500, and 1,000 r.p.m. Motion pictures were also taken of gasoline sprays injected into the cylinder during the intake stroke. The air flow produced by each cylinder head is described and some results of the velocity measurements of feathers are presented. The apparent time intervals required for vaporization of the gasoline sprays are also given.
Contributing Partner: UNT Libraries Government Documents Department
Flight investigation of control-stick vibration of the YG-1B autogiro

Flight investigation of control-stick vibration of the YG-1B autogiro

Date: June 1, 1940
Creator: Bailey, F J , Jr
Description: As a preliminary step in an investigation of control-stick vibration in direct-control autogiros, the periodic variations in the moments transmitted through the control system of a YG-1B autogiro were recorded in flight. The results of the measurements are presented in the form of coefficients of Fourier series expressing the varying part of the lateral and the longitudinal moments acting between rotor and fuselage at the control trunnions. The most important component of the variation in stick force was found to have frequency of three times the rotor speed and an amplitude that rose from negligible values at tip-speed ratio below 0.20 to +/-5.2 pounds longitudinally and +/-3.2 pounds laterally at tip-speed ratios of 0.35. Variations in stick force at all other frequencies were small in comparison with those at three times the rotor speed.
Contributing Partner: UNT Libraries Government Documents Department
Italian high-speed airplane engines

Italian high-speed airplane engines

Date: June 1, 1940
Creator: Bona, C F
Description: This paper presents an account of Italian high-speed engine designs. The tests were performed on the Fiat AS6 engine, and all components of that engine are discussed from cylinders to superchargers as well as the test set-up. The results of the bench tests are given along with the performance of the engines in various races.
Contributing Partner: UNT Libraries Government Documents Department
A method of measuring piston temperatures

A method of measuring piston temperatures

Date: June 1, 1940
Creator: Pinkel, Benjamin & Mangniello, Eugene J
Description: A method that makes use of thermocouples has been developed to measure the temperature of engine pistons operating at high speeds. The thermocouples installed on the moving piston are connected with a potentiometer outside the engine by means of pneumatically operated plungers, which make contact with the piston thermocouples for about 10 crankshaft degrees at the bottom of the piston stroke. The equipment is operated satisfactory at engine speeds of 2,400 r.p.m. and shows promise of successful operation at higher engine speeds. Measurements of piston temperatures in a liquid-cooled compression-ignition engine and in an air-cooled spark-ignition are presented.
Contributing Partner: UNT Libraries Government Documents Department
Tests of lead-bronze bearings in the DVL bearing-testing machine

Tests of lead-bronze bearings in the DVL bearing-testing machine

Date: June 1, 1940
Creator: Fischer, G
Description: The lead-bronze bearings tested in the DVL machine have proven themselves very sensitive to load changes as in comparison with bearings of light metal. In order to prevent surface injuries and consequently running interruptions, the increase of the load has to be made in small steps with sufficient run-in time between steps. The absence of lead in the running surface, impurities in the alloy (especially iron) and surface irregularities (pores) decreases the load-carrying capacity of the bearing to two or three times that of the static load.
Contributing Partner: UNT Libraries Government Documents Department
Comparison of Three Exit-Area Control Devices on an N.A.C.A. Cowling, Special Report

Comparison of Three Exit-Area Control Devices on an N.A.C.A. Cowling, Special Report

Date: May 1, 1940
Creator: McHugh, James G.
Description: Adjustable cowling flaps, an adjustable-length cowling skirt, and a bottom opening with adjustable flap were tested as means of controlling the rate of cooling-air flow through an air-cooled radial-engine cowling. The devices were tested in the NACA 20-foot tunnel on a model wing-nacelle-propeller combination, through an airspeed range of 20 to 80 miles per hour, and with the propeller blade angle set 23 degrees at 0.75 of the tip radius. The resistance of the engine to air flow through the cowling was simulated by a perforated plate. The results indicated that the adjustable cowling flap and the bottom opening with adjustable flap were about equally effective on the basis of pressure drop obtainable and that both were more effective means of increasing the pressure drop through the cowling than the adjustable-length skirt. At conditions of equal cooling-air flow, the net efficiency obtained with the adjustable cowling flaps and the adjustable-length cowling skirt was about 1% greater than the net efficiency obtained with the bottom opening with adjustable flap.
Contributing Partner: UNT Libraries Government Documents Department