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Operation and Care of Vehicle-Type Batteries

Description: Manual for operation and care of storage batteries for use in Army depots.
Date: June 7, 1920
Creator: Vinal, George W.
Partner: UNT Libraries Government Documents Department
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Absolute Coefficients and the Graphical Representation of Aerofoil Characteristics

Description: It is argued that there should be an agreement as to what conventions to use in determining absolute coefficients used in aeronautics and in how to plot those coefficients. Of particular importance are the absolute coefficients of lift and drag. The author argues for the use of the German method over the kind in common use in the United States and England, and for the Continental over the usual American and British method of graphically representing the characteristics of an airfoil.
Date: June 1921
Creator: Munk, Max
Partner: UNT Libraries Government Documents Department
open access

Airplane Balance

Description: The authors argue that the center of gravity has a preponderating influence on the longitudinal stability of an airplane in flight, but that manufacturers, although aware of this influence, are still content to apply empirical rules to the balancing of their airplanes instead of conducting wind tunnel tests. The author examines the following points: 1) longitudinal stability, in flight, of a glider with coinciding centers; 2) the influence exercised on the stability of flight by the position of… more
Date: June 1921
Creator: Huguet, L.
Partner: UNT Libraries Government Documents Department
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The development of German Army airplanes during the war

Description: From Summary: "The author, who was a captain of the Reserves in the Technical Department of the Aviation Division (Board of Airplane Experts) during the war, shows what means were taken for the creation of new airplane types and what tests were employed for trying out their flying properties, capacities and structural reliability. The principal representative types of each of the classes of airplanes are described and the characteristics of the important structural parts are discussed. Data reg… more
Date: June 1921
Creator: Hoff, Wilhelm
Partner: UNT Libraries Government Documents Department
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Distant-Compass

Description: Report presenting a description of fluid compasses that are being used in aircraft, including why magnetic compasses are not usable. Details of the distant compass are provided, which is an improved form of the compass that has a practical application in seaplanes.
Date: June 1921
Creator: Friedensburg, Walter & Miner, D. M.
Partner: UNT Libraries Government Documents Department
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The Dynamometer Hub and the Flywheel of the Engine

Description: Report presenting a description of the interaction between the dynamometer hub and the flywheel of the engine in aircraft. The negative rotary moments in propellers generally allow for the cessation of one cylinder without any lifting on the part of the propeller, and without depriving the engine of its flywheel.
Date: June 1921
Creator: Everling, E.
Partner: UNT Libraries Government Documents Department
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Flexibility of Bearing Surfaces and Stress on Fabrics

Description: Report presenting an investigation of the flexibility of bearing surfaces and stress on fabrics used in wings. Equations are given for calculating some of these loading factors.
Date: June 1921
Creator: Pröll, A.
Partner: UNT Libraries Government Documents Department
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Observations on the Method of Determining the Velocity of Airships

Description: To obtain the absolute velocity of an airship by knowing the speed at which two routes are covered, we have only to determine the geographical direction of the routes which we locate from a map, and the angles of routes as given by the compass, after correcting for the variation (the algebraical sum of the local magnetic declination and the deviation).
Date: June 1921
Creator: Volterra, Vito
Partner: UNT Libraries Government Documents Department
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Simple Means for Saving Fuel on Traffic Flights

Description: Report presenting a discussion of ways to save fuel on traffic flights, including some calculations that can be used for determining fuel efficiency. The primary ways of lessening fuel consumption include flying with a throttled engine and diminished speed.
Date: June 1921
Creator: Kook, E.
Partner: UNT Libraries Government Documents Department
open access

Coal-Dust Explosion Tests in the Experimental Mine 1913-1918, Inclusive

Description: Report issued by the Bureau of Mines over experiments conducted on coal-dust explosions. The results of the experiments are presented and discussed. This report includes tables, illustrations, and photographs.
Date: June 1922
Creator: Rice, George S.; Jones, Lewis M.; Egy, Willard Leo & Greenwald, H. P.
Partner: UNT Libraries Government Documents Department
open access

Comfort in Flight

Description: Some advances in passenger comfort are discussed, namely, ventilated cabins, heating, seating arrangements, and doors.
Date: June 1922
Creator: Warner, Edward P.
Partner: UNT Libraries Government Documents Department
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Comparing Maximum Pressures in Internal Combustion Engines

Description: Thin metal diaphragms form a satisfactory means for comparing maximum pressures in internal combustion engines. The diaphragm is clamped between two metal washers in a spark plug shell and its thickness is chosen such that, when subjected to explosion pressure, the exposed portion will be sheared from the rim in a short time.
Date: June 1922
Creator: Sparrow, Stanwood W. & Lee, Stephen M.
Partner: UNT Libraries Government Documents Department
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Effect of Structure in Middle Part of Leading Edge of a Thick Wing: Communication From Rijks-Studiedienst Voor De Luchtvaart of Amsterdam

Description: The experiments herein described were made for the purpose of finding whether removing a larger portion of the wing to improve the pilot's view would be possible, without too great detriment to the aerodynamic properties of the airplane. The experiments were conducted on a wing similar to the Fokker F III.
Date: June 1922
Partner: UNT Libraries Government Documents Department
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Engine Pistons of Light Metal

Description: This report presents the results of testing 32 sets of light metal pistons from 16 different aluminum and magnesium alloys, 2 sets of cast iron pistons, and one piston of pure electrolytic copper. The many-fold mutual relations between material properties, shape, thermic and dynamic processes in the engine were clarified by comprehensive technical, thermic, chemical, physical and metallographic investigations of pistons and piston materials.
Date: June 1922
Creator: Becker, G.
Partner: UNT Libraries Government Documents Department
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Fakir Fuel Pump

Description: "In designing the Fakir fuel pump, the fundamental idea was to obtain a simple and reliable method of conveying the fuel from a low tank to the carburetor, with the avoidance of the faults of all former methods and the simultaneous warming of the fuel by means of the heat of compression generated. The principle of the Fakir fuel pump rests on the well-known principle of the diaphragm pump, which must be suitably adapted to the present purpose" (p. 1).
Date: June 1922
Partner: UNT Libraries Government Documents Department
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Lecture on the Rhon soaring flight competition, 1921

Description: This article presents a recounting of the Rhon soaring competition with emphasis on new designs, results, and prizes awarded. A round-robin discussion is also included at the end of the report.
Date: June 1922
Creator: Hoff, Wilhelm
Partner: UNT Libraries Government Documents Department
open access

Notes on the standard atmosphere

Description: From Summary: "This report contains the derivation of a series of relations between temperature, pressure, density, and altitude in a standard atmosphere which assumes a uniform decrease of temperature with altitude. The equations are collected and given with proper constants in both metric and English units for the temperature gradient adopted by the National Advisory Committee for Aeronautics. A table of values of temperature pressure and density at various altitudes in this standard atmosphe… more
Date: June 1922
Creator: Diehl, Walter S.
Partner: UNT Libraries Government Documents Department
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Problem of the Slotted Wing: A Communication From the Aerodynamic Institute of the Aachen Technical High School

Description: "It is to be expected that the advantageous properties, hitherto discovered in many slotted wing sections, depend very largely on the contour of the slot and the structural details of the wing. It is therefore of interest, aside from measurements on wings of constant cross-section along the span, to measure also wing models in which the structural details have already been given practical consideration" (p. 1).
Date: June 1922
Creator: Klemperer, W.
Partner: UNT Libraries Government Documents Department
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The Prospects of the Helicopter

Description: The advantages of helicopters are listed along with a discussion of safety devices, the problems of control, and the need for horizontal flight.
Date: June 1922
Creator: Warner, Edward P.
Partner: UNT Libraries Government Documents Department
open access

The R-38 Catastrophe and the Mechanics of Rigid Airship Construction

Description: An airship frame may be regarded as a rigid girder subjected to a number of forces which, according to their nature, may be classified as follows: weight or loads (force of gravity); lifting forces (aero-static); accelerations (dynamic). These forces must be in equilibrium in the three most important cases during flight: 1) when the airship is floating (aerostatic problem); 2) when flying without acceleration (aerodynamic problem). 3) When under the influence of any accelerating force (dynamic … more
Date: June 1922
Creator: Herrera, Emilio
Partner: UNT Libraries Government Documents Department
open access

Recent Progress in the Thawing of Frozen Gravel in Placer Mining

Description: Technical paper issued by the Bureau of Mines over progress made for thawing gravel in placer mines. Different thawing tests are presented and discussed. This paper includes tables, photographs, and illustrations.
Date: June 1922
Creator: Janin, Charles
Partner: UNT Libraries Government Documents Department
open access

Simple formula for estimating airplane ceilings

Description: From Summary: "The aeronautical engineer often has occasion to estimate the absolute ceiling of an airplane for which a detailed performance calculation is out of the question. In such cases it is customary to use either empirical performance charts or formulae. The performance charts given in several of the recent works on aeronautics are satisfactory so long as the airplane under consideration does not depart too far from the average in its characteristics. The formulae, with one exception, a… more
Date: June 1922
Creator: Diehl, Walter S.
Partner: UNT Libraries Government Documents Department
open access

Theory of the Slotted Wing

Description: Report presenting information regarding the use of slots in an airplane wing to considerably increase the lift and make it possible to operate the wing at higher angles of attack.
Date: June 1922
Creator: Betz, A.
Partner: UNT Libraries Government Documents Department
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