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Airplane Flight in the Stratosphere

Description: This brief survey of the problems encountered in high-altitude flight deals in particular with the need for high lift coefficient in the wings, large aspect ratios in the wings, and also the problem of hermetically sealing the cabin.
Date: February 1932
Creator: de Caria, Ugo
Item Type: Refine your search to only Report
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Disintegration of a Liquid Jet

Description: This report presents an experimental determination of the process of disintegration and atomization in its simplest form, and the influence of the physical properties of the liquid to be atomized on the disintegration of the jet. Particular attention was paid to the investigation of the process of atomization.
Date: February 1932
Creator: Haenlein, A.
Item Type: Refine your search to only Report
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Effect of aging on taut rubber diaphragms

Description: As part of an investigation of special compositions of rubber suitable for use as diaphragms for aircraft instruments, six samples were used as taut diaphragms in instruments and allowed to age for five years. Two of the instruments were in operating condition after this period of time and one had remarkably little change in performance. In making the rubber tetraethyl thorium disulfide was employed as a vulcanizing agent.
Date: February 1932
Creator: Strother, D. H. & Henrickson, H. B.
Item Type: Refine your search to only Report
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The Effect of Humidity on Engine Power at Altitude

Description: "From tests made in the altitude chamber of the Bureau of Standards, it was found that the effect of humidity on engine power is the same at altitudes up to 25,000 feet as at sea level. Earlier tests on automotive engines, made under sea-level conditions, showed that water vapor acts as an inert diluent, reducing engine power in proportion to the amount of vapor present. By combining the effects of atmospheric pressure, temperature, and humidity, it is shown that the indicated power obtainable … more
Date: February 24, 1932
Creator: Brooks, D. B. & Garlock, E. A.
Item Type: Refine your search to only Report
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The effect of nozzle design and operating conditions on the atomization and distribution of fuel sprays

Description: The atomization and distribution characteristics of fuel sprays from automatic injection valves for compression-ignition engines were determined by catching the fuel drops on smoked-glass plates, and then measuring and counting the impressions made in the lampblack. The experiments were made in an air-tight chamber in which the air density was raised to values corresponding to engine conditions.
Date: February 19, 1932
Creator: Lee, Dana W.
Item Type: Refine your search to only Report
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Effect of the Reservoir Volume on the Discharge Pressures in the Injection System of the N.A.C.A. Spray Photography Equipment

Description: "Tests were made to determine the effect of the reservoir volume on the discharge pressures in the injection system of the N.A.C.A. spray photography equipment. The data obtained are applicable to the design of a common rail fuel-injection system. The data show that an injection system of the type described can be designed so that not more than full load fuel quantity can be injected into the engine cylinders, and so that the fuel spray characteristics remain constant over a large range of engi… more
Date: February 1932
Creator: Rothrock, A. M. & Lee, D. W.
Item Type: Refine your search to only Report
open access

Experiments on the distribution of fuel in fuel sprays

Description: The distribution of fuel in sprays for compression-ignition engines was investigated by taking high-speed spark photographs of fuel sprays reproduced under a wide variety of conditions, and also by injecting them against pieces of plasticine. A photographic study was made of sprays injected into evacuated chambers, into the atmosphere, into compressed air, and into transparent liquids. Pairs of identical sprays were injected counter to each other and their behavior analyzed. Small high velocity… more
Date: February 13, 1932
Creator: Lee, Dana W.
Item Type: Refine your search to only Report
open access

Preliminary Tests on the Vaporization of Fuel Sprays

Description: "High-speed motion pictures were taken of fuel sprays injected into the combustion chamber of the N.A.C.A. combustion apparatus. Three fuels, ethyl alcohol, gasoline, and fuel oil, which differed considerably in volatility were tested. By maintaining the engine temperature below that required for ignition the spray could be studied from soon after the start of injection until 130 crank degrees later. The results show that the sprays vaporize appreciably so that it is possible for the ignition i… more
Date: February 1932
Creator: Rothrock, A. M.
Item Type: Refine your search to only Report
open access

Resonance Vibrations of Aircraft Propellers

Description: On the basis of the consideration of various possible kinds of propeller vibrations, the resonance vibrations caused by unequal impacts of the propeller blades appear to be the most important. Their theoretical investigation is made by separate analysis of torsional and bending vibrations. This method is justified by the very great difference in the two natural frequencies of aircraft propeller blades. The calculated data are illustrated by practical examples.
Date: February 1932
Creator: Liebers, Fritz
Item Type: Refine your search to only Report
open access

Valve Timing of Engines Having Intake Pressures Higher Than Exhaust

Description: Note presenting an investigation to determine the possible improvement in performance by using a large amount of valve overlap on a supercharged engine. A series of tests was made on the NACA universal single-cylinder engine of 5-inch bore and 7-inch stroke with varying amounts of overlap from 0 to 100 degrees at five different intake pressures.
Date: February 1932
Creator: Taylor, Edward S.
Item Type: Refine your search to only Report
open access

Wind-tunnel research comparing lateral control devices, particularly at high angles of attack 2: slotted ailerons and frise ailerons

Description: Three model wings, two with typical slotted ailerons and one with typical frise ailerons, have been tested as part of a general investigation on lateral control devices with particular reference to their effectiveness at high angles of attack, in the 7 by 10 foot wind tunnel of the National Advisory Committee for Aeronautics. Force tests, free-autorotation tests, and forced-rotation tests were made which show the effect of the various ailerons on the general performance of the wing, on the late… more
Date: February 18, 1932
Creator: Weick, Fred E. & Noyes, Richard W.
Item Type: Refine your search to only Report
open access

Wind-Tunnel Research Comparing Lateral Control Devices, Particularly at High Angles of Attack 3: Ordinary Ailerons Rigged Up 10 Degrees When Neutral

Description: This report presents the results of wind-tunnel tests made on three model wings having different sizes of ordinary ailerons rigged up 10 degrees when neutral, the same models having previously been tested with the ailerons rigged even with the wings in the usual manner. One of the wings had ailerons of medium size, 25 per cent of the wing chord by 40 per cent of the semispan, one had long, narrow ailerons, and one had short, wide ones. These tests are part of a general investigation on lateral … more
Date: February 5, 1932
Creator: Weick, Fred E. & Wenzinger, Carl J.
Item Type: Refine your search to only Report
open access

Wind-tunnel research comparing lateral control devices, particularly at high angles of attack 4: floating tip ailerons on rectangular wings

Description: "This report is the fourth of a series on systematic tests conducted which compares lateral control devices with particular reference to their effectiveness at high angles of attack. The present report covers tests with floating tip ailerons on rectangular Clark y wings. Ailerons of two profiles were tested - symmetrical and Clark y, both with adjustable trailing-edge flaps. Each form was tested at three hinge-axis locations, both with and without vertical end plates between the ailerons and th… more
Date: February 18, 1932
Creator: Weick, Fred E. & Harris, Thomas A.
Item Type: Refine your search to only Report
open access

Wind-Tunnel Tests of a Clark Y Wing With a Narrow Auxiliary Airfoil in Different Positions

Description: "Aerodynamic force tests were made on a combination of a Clark Y wing and a narrow auxiliary airfoil to find the best location of the auxiliary airfoil with respect to the main wing. The auxiliary was a highly cambered airfoil of medium thickness having a chord 14.5 per cent that of the main wing. It was tested in 141 different positions ahead of, above, and behind the nose portion of the main wing, the range of the test points being extended until the best aerodynamic conditions were covered" … more
Date: February 23, 1932
Creator: Weick, Fred E. & Bamber, Millard J.
Item Type: Refine your search to only Report
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