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  Partner: UNT Libraries Government Documents Department
 Decade: 1920-1929
 Year: 1921
 Collection: National Advisory Committee for Aeronautics Collection
Lift theory of supporting surfaces : second article

Lift theory of supporting surfaces : second article

Date: September 1, 1921
Creator: Von Mises, R
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Tin soldering of aluminum and its alloys

Tin soldering of aluminum and its alloys

Date: October 1, 1921
Creator: Gallo, Gino
Description: A method is presented for soldering aluminum to other metals. The method adopted consists of a galvanic application to the surface of the light-metal parts to be soldered, of a layer of another metal, which, without reacting electrolytically on the aluminum, adheres strongly to the surface to which it is applied, and is, on the other hand, adapted to receive the soft solder. The metal found to meet the criteria best was iron.
Contributing Partner: UNT Libraries Government Documents Department
Analytical methods for computing the polar curves of airplanes

Analytical methods for computing the polar curves of airplanes

Date: March 1, 1921
Creator: LE SUEUR
Description: This report presents a method of calculating polar curves which is at least as precise as graphical methods, but it more rapid. Knowing the wind tunnel test of a wing and the performances of an airplane of the same profile, it is easy to verify the characteristic coefficients and, at the same time, the methods determining induced resistances.
Contributing Partner: UNT Libraries Government Documents Department
Some new tests at the Gottingen laboratory

Some new tests at the Gottingen laboratory

Date: April 1, 1921
Creator: unknown
Description: The tests at the Gottingen laboratory included: friction tests on a surface treated with omelette, verification tests on the M.V.A. 356 wing, and comparative tests of wing no. 36 at the Eiffel laboratory. The examination of all these experiments leads to the belief that, at large incidences, the speeds registered by the suction manometer of the testing chamber of the Eiffel laboratory wind tunnel are, owing to pressure drop, greater than the actual speeds. Therefore, the values of k(sub x) and k(sub y) measured at the Eiffel laboratory at large incidences are too low.
Contributing Partner: UNT Libraries Government Documents Department
Distant-compass

Distant-compass

Date: June 1, 1921
Creator: Friedensburg, Walter & Miner, D M
Description: None
Contributing Partner: UNT Libraries Government Documents Department
On the definition of the standard atmosphere

On the definition of the standard atmosphere

Date: April 1, 1921
Creator: Grimault, P
Description: On April 15, 1920, the under Secretary of State for Aeronautics and Aerial Transport decided to adopt as Standard Atmosphere for official airplane tests in France, the atmosphere defined by the following law, known as the Law of the S.T.You.(Technical Section of Aeronautics): From 0 to 11,000 m. - 0=15-0.0065 Z and above 11,000 m. - 0= -56.5 degrees being the temperature in centigrade degrees at altitude Z expressed in meters. For altitude 0 the pressure is 760 mm of mercury. In the magazine "L'Aeronautique" Mr. A. Toussaint has already written at length on the first studies which led to the elaboration of this law. Since that time the results obtained have been confirmed by fuller and more abundant data which have justified the official adoption of the Law of the S.T. You. The object of the present article is to give a summary exposition and discussion of the ideas and documents which form the basis of the question.
Contributing Partner: UNT Libraries Government Documents Department
The drawing of experimental curves

The drawing of experimental curves

Date: July 1, 1921
Creator: Norton, F H
Description: This report presents a discussion of how to determine the location of a line or surface from experimental data. What we desire to know practically is the number of ordinates required to obtain a certain probable precision in drawing a line or surface.
Contributing Partner: UNT Libraries Government Documents Department
The determination of the effective resistance of a spindle supporting a model airfoil

The determination of the effective resistance of a spindle supporting a model airfoil

Date: January 1, 1921
Creator: Davidson, W E & Bacon, D L
Description: An attempt was made to determine the effect of spindle interference on the lift of the airfoil by measuring moments about the axis parallel to the direction of air flow. The values obtained are of the same degree as the experimental error, and for the present this effect will be neglected. The results obtained using a U.S.A. 15 wing (plotted here) show that the correction is nearly constant from 0 degrees to 10 degrees incidence and that at greater angles its value becomes erratic. At such angles, however, the wing drag is so high that the spindle correction and its attendant errors become relatively small and unimportant.
Contributing Partner: UNT Libraries Government Documents Department
Loads and calculations of army airplanes

Loads and calculations of army airplanes

Date: February 1, 1921
Creator: Stelmachowski, Ing
Description: By comparing airplanes of known strength that have resisted all the usual and even extreme air loads with those that under like conditions were found to be insufficiently strong, the researchers, aided by scientific investigations, developed standards which are satisfactory for the calculation of airplane structures. Given here are standards applicable to loads on wing trusses, load factors for use in stress analysis, load factors required in sand testing, loads on control surfaces, loads on wing ribs, loads on landing gear, and rigidity of materials.
Contributing Partner: UNT Libraries Government Documents Department
Sixth meeting of the members of the German Scientific Association for Aeronautics

Sixth meeting of the members of the German Scientific Association for Aeronautics

Date: April 1, 1921
Creator: unknown
Description: None
Contributing Partner: UNT Libraries Government Documents Department
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