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Spontaneous Combustion of Hydrogen

Description: It is shown by the author's experiments that hydrogen which escapes to the atmosphere through openings in the system may burn spontaneously if it contains dust. Purely thermal reasoning can not account for the combustion. It seems to be rather an electrical ignition. In order to determine whether the cause of the spontaneous ignition was thermo-chemical, thermo-mechanical, or thermo-electrical, the experiments in this paper were performed.
Date: March 4, 1922
Creator: Pothmann, P. & Nusselt, Wilhelm
Item Type: Refine your search to only Report
open access

Water pressure distribution on a flying boat hull

Description: This is the third in a series of investigations of the water pressures on seaplane floats and hulls, and completes the present program. It consisted of determining the water pressures and accelerations on a Curtiss H-16 flying boat during landing and taxiing maneuvers in smooth and rough water.
Date: December 4, 1929
Creator: Thompson, F. L.
Item Type: Refine your search to only Report
open access

The effect of valve timing upon the performance of a supercharged engine at altitude and an unsupercharged engine at sea level

Description: This investigation was conducted to determine the comparative effects of valve timing on the performance of an unsupercharged engine at sea level and a supercharged engine at altitude. The tests were conducted on the NACA universal test engine. The timing of the four valve events was varied over a wide range; the engine speeds were varied between 1,050 and 1,500 r.p.m.; the compression ratios were varied between 4.35:1 and 7.35:1. The conditions of exhaust pressure and carburetor pressure of a … more
Date: February 4, 1931
Creator: Schey, Oscar W. & Biermann, Arnold E.
Item Type: Refine your search to only Report
open access

Span-load distribution as a factor in stability in roll

Description: "This report gives the results of pressure-distribution tests made to study the effects on lateral stability of changing the span-load distribution on a rectangular monoplane wing model of fairly thick section. Three methods of changing the distribution were employed: variation in profile along the span to a thin symmetrical section at the tip, twist from +5 degrees to -15 degrees at the tip, and sweepback from +20 degrees to -20 degrees. The tests were conducted in a 5-foot closed-throat atmos… more
Date: March 4, 1931
Creator: Knight, Montgomery & Noyes, Richard W.
Item Type: Refine your search to only Report
open access

Fuel vaporization and its effect on combustion in a high-speed compression-ignition engine

Description: "The tests discussed in this report were conducted to determine whether or not there is appreciable vaporization of the fuel injected into a high-speed compression-ignition engine during the time available for injection and combustion. The effects of injection advance angle and fuel boiling temperature were investigated. The results show that an appreciable amount of the fuel is vaporized during injection even though the temperature and pressure conditions in the engine are not sufficient to ca… more
Date: May 4, 1932
Creator: Rothrock, A. M. & Waldron, C. D.
Item Type: Refine your search to only Report
open access

General Potential Theory of Arbitrary Wing Sections

Description: The problem of determining the two dimensional potential flow around wing sections of any shape is examined. The problem is condensed into the compact form of an integral equation capable of yielding numerical solutions by a direct process. An attempt is made to analyze and coordinate the results of earlier studies relating to properties of wing sections. The existing approximate theory of thin wing sections and the Joukowski theory with its numerous generalizations are reduced to special cases… more
Date: November 4, 1932
Creator: Theodorsen, T. & Garrick, I. E.
Item Type: Refine your search to only Report
open access

A comparison of fuel sprays from several types of injection nozzles

Description: This report presents the tests results of a series of tests made of the sprays from 14 fuel injection nozzles of 9 different types, the sprays being injected into air at atmospheric density and at 6 and 14 times atmospheric density. High-speed spark photographs of the sprays from each nozzle at each air density were taken at the rate of 2,000 per second, and from them were obtained the dimensions of the sprays and the rates of spray-tip penetration. The sprays were also injected against plastic… more
Date: December 4, 1934
Creator: Lee, Dana W.
Item Type: Refine your search to only Report
open access

Cooling characteristics of a 2-row radial engine

Description: This report presents the results of cooling tests conducted on a calibrated GR-1535 Pratt and Whitney Wasp, Jr. Engine installed in a Vought X04U-2 airplane. The tests were made in the NACA full-scale tunnel at air speeds from 70 to 120 miles per hour, at engine speeds from 1,500 to 2,600 r.p.m., and at manifold pressures from 19 to 33 inches of mercury absolute. A Smith controllable propeller was used to facilitate obtaining the different combinations of engine speed, power, and manifold press… more
Date: December 4, 1934
Creator: Schey, Oscar W. & Rollin, Vern G.
Item Type: Refine your search to only Report
open access

Propulsion of a flapping and oscillating airfoil

Description: Formulas are given for the propelling or drag force experience in a uniform air stream by an airfoil or an airfoil-aileron combination, oscillating in any of three degrees of freedom; vertical flapping, torsional oscillations about a fixed axis parallel to the span, and angular oscillations of the aileron about a hinge.
Date: May 4, 1936
Creator: Garrick, I. E.
Item Type: Refine your search to only Report
open access

Characteristics of six propellers including the high-speed range

Description: This investigation is part of an extensive experimental study that has been carried out at full scale in the NACA 20-foot tunnel, the purpose of which has been to furnish information in regard to the functioning of the propeller-cowling-nacelle unit under all conditions of take-off, climbing, and normal flight. This report presents the results of tests of six propellers in the normal and high-speed flight range and also includes a study of the take-off characteristics.
Date: June 4, 1936
Creator: Theodorsen, Theodore; Stickle, George W. & Brevoort, M. J.
Item Type: Refine your search to only Report
open access

Tank Tests of the Effect of Rivet Heads, etc., on the Water Performance of a Seaplane Float, Special Report

Description: "A 1/3.5 full-size model of the Mark V float of the Bureau of Aeronautics, Navy Department, was tested in the NACA tank both with smooth painted bottom surfaces and with roundhead rivets, plate laps, and keel plates fitted to simulate the actual bottom of a metal float. The augmentation in water resistance due to the added roughness was found to be from 10-12% at the hum speed and from 12-14% at high speeds. The effect of the roughness of the afterbody was found to be negligible except at high … more
Date: June 4, 1936
Creator: Parkinson, J. B. & Robertson, J. B., Jr.
Item Type: Refine your search to only Report
open access

Pressure-distribution measurements at large angles of pitch on fins of different span-chord ratio on a 1/40-scale model of the U. S. Airship "Akron"

Description: Report presents the results of pressure-distribution measurements on a 1/40-scale model of the U. S. Airship "Akron" conducted in the NACA 20-foot wind tunnel. The measurements were made on the starboard fin of each of four sets of horizontal tail surfaces, all of approximately the same area but differing in span-chord ratio, for five angles of pitch varying from 11.6 degrees to 34 degrees, for four elevator angles, and at air speeds ranging from 56 to 77 miles per hour. Pressures were also mea… more
Date: April 4, 1937
Creator: McHugh, James G.
Item Type: Refine your search to only Report
open access

Experimental Investigation of Wind-Tunnel Interference on the Downwash Behind an Airfoil

Description: "The interference of the wind-tunnel boundaries on the downwash behind an airfoil has been experimentally investigated and the results have been compared with the available theoretical results for open-throat wind tunnels. As in previous studies, the simplified theoretical treatment that assumes the test section to be an infinite free jet has been shown to be satisfactory at the lifting line. The experimental results, however, show that this assumption may lead to erroneous conclusions regardin… more
Date: June 4, 1937
Creator: Silverstein, Abe & Katzoff, S.
Item Type: Refine your search to only Report
open access

A theoretical study of lateral stability with an automatic pilot

Description: "The influence of automatic operation of the aileron and rudder controls on the lateral stability of an airplane is discussed. The control deflections are assumed to be proportional to the deviations and to the rates of deviation of the airplane from steady-flight conditions. The effects of changes in the types of deviation governing control application are considered. For one simple method of control in which the aileron deflection is proportional to the angle of bank and the rudder deflection… more
Date: March 4, 1940
Creator: Imlay, Frederick H.
Item Type: Refine your search to only Report

Newsmap. Monday, May 4, 1942 : week of April 24 to May 1

Description: Text describes action on various war fronts: Japs advance to Lashio -- Allies raid Lae -- Japs attack in China -- Malta sends greetings -- Hitler in Detroit from Moscow -- Yanks in New Caledonia -- Gen. George killed -- Fourth registration -- President calls nation to new sacrifice -- Price control fixed -- Rescued crew hits sub -- U.S. movies bootlegged -- Home worries Hitler -- Eastern seaboard put under Army safeguard -- RAF 'second front' opens -- Malta stiffens fight -- Greek guerillas act… more
Date: May 4, 1942
Creator: [United States]. Army Orientation Course.
Item Type: Refine your search to only Poster

Newsmap. Monday, January 4, 1943 : week of December 25 to January 1

Description: Front: Text describes action on various war fronts: North Africa, Command, Libya, New Guinea, Solomons, Burma, Russia, Fr. Somaliland. Large world map is keyed to text and illustrates time zones around the world. Includes inset maps: Indonesia -- Rostov region [USSR]. Photographs: Blimp patrol -- Supplies for Guadalcanal -- Along the road to Tunisia. Back: The Nerve System of the Army: text, illustration, and photographs show contributions of the Signal Corps to the war effort.
Date: January 4, 1943
Creator: [United States.] Army Orientation Course.
Item Type: Refine your search to only Poster
open access

A Theoretical Investigation of the Lateral Oscillations of an Airplane With Free Rudder With Special Reference to the Effect of Friction

Description: "Charts showing the variation in dynamic stability with the rudder hinge-moment characteristics are presented. A stabilizing rudder floating tendency combined with a high degree of aerodynamic balance is shown to lead to oscillations of increasing amplitude. This dynamic instability is increased by viscous-friction in the rudder control system" (p. 147).
Date: March 4, 1943
Creator: Greenberg, Harry & Sternfield, Leonard
Item Type: Refine your search to only Report
open access

The Effect of Fast Fission on k

Description: The importance of fast neutron fission (i.e., fission caused by neutrons before being slowed down) was recognized by Szilard, and calculations similar to the present one have already been carried out by him, Feld, Ashkin, Wheeler, Wigner and others. The purpose of the present paper is to give a general formula for the contribution of fast fission to the multiplication constant, which will include all the cases already considered and will be applicable to more complicated geometries than those c… more
Date: May 4, 1943
Creator: Castle, H.; Ibser, H.; Sacher, G. & Weinberg, Alvin Martin, 1915-2006
Item Type: Refine your search to only Report

Newsmap. Monday, October 4, 1943 : week of September 23 to September 30, 212th week of the war, 94th week of U.S. participation

Description: Front: Text describes action on various war fronts: Italy, Corsica, Russia, New Georgia, Gilbert Is., Ellice Is., New Guinea, Western Europe. Maps show Northeast New Guinea; central Italy; Italy, Yugoslavia, Sardinia, Sicily, Tunisia. All maps show Nazi or Japanese occupied areas. Includes photographs: Naples, On the beach at Salerno, Smoke screen over Palermo, Ship with a mouth. Back: A mournful melody, or, a dud dood it again : and watch out for booby traps! 8 cartoon panels graphically d… more
Date: October 4, 1943
Creator: [United States.] Army Orientation Course.
Item Type: Refine your search to only Poster
open access

Transportation Corps : railway-operating battalion.

Description: Describes "the organization and operation of the railway-operating battalion upon a railway operated by the Military Railway Service. Its purpose is to assist military railway officers in the training and operation of their units and to guide command and staff officers charged with their employment."
Date: February 4, 1944
Creator: United States. War Department.
Item Type: Refine your search to only Book
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