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 Serial/Series Title: NACA Technical Memorandums
 Collection: Technical Report Archive and Image Library
Accurate calculation of multispar cantilever and semicantilever wings with parallel webs under direct and indirect loading

Accurate calculation of multispar cantilever and semicantilever wings with parallel webs under direct and indirect loading

Date: March 1, 1932
Creator: Sanger, Eugen
Description: In the present report the computation is actually carried through for the case of parallel spars of equal resistance in bending without direct loading, including plotting of the influence lines; for other cases the method of calculation is explained. The development of large size airplanes can be speeded up by accurate methods of calculation such as this.
Contributing Partner: UNT Libraries Government Documents Department
Acoustics of a nonhomogeneous moving medium.

Acoustics of a nonhomogeneous moving medium.

Date: February 1, 1956
Creator: Blokhintsev, D I
Description: Theoretical basis of the acoustics of a moving nonhomogeneous medium is considered in this report. Experiments that illustrate or confirm some of the theoretical explanation or derivation of these acoustics are also included.
Contributing Partner: UNT Libraries Government Documents Department
Activation of hydrocarbons and the octane number

Activation of hydrocarbons and the octane number

Date: October 1, 1939
Creator: Peschard, Marcel
Description: This report presents an examination of the history of research on engine knocking and the various types of fuels used in the investigations of this phenomenon. According to this report, the spontaneous ignition of hydrocarbons doped with oxygen follows the logarithmic law within a certain temperature range, but not above 920 degrees K. Having extended the scope of investigations to prove hydrocarbons, the curves of the mixtures burned by air should then be established by progressive replacement of pure iso-octane with heptane. Pentane was also examined in this report.
Contributing Partner: UNT Libraries Government Documents Department
Additional test data on static longitudinal stability

Additional test data on static longitudinal stability

Date: August 1, 1934
Creator: Hubner, Walter
Description: The purpose of this investigation was to explore the influence of weights of the controls on the stability with elevator released. The available test data were extended to stability with elevator locked. In this connection the study of the propeller effect seemed of vital importance.
Contributing Partner: UNT Libraries Government Documents Department
Aerial convention of October 13, 1919

Aerial convention of October 13, 1919

Date: May 1, 1922
Creator: Roper,
Description: The aerial convention delegates are listed as well as the set of rules that were developed during the session.
Contributing Partner: UNT Libraries Government Documents Department
Aerial navigation by dead reckoning

Aerial navigation by dead reckoning

Date: July 1, 1922
Creator: Maffert, Pierre
Description: The problem to be solved, as presented to the pilot or observer of an aircraft, is as follows: The aircraft starting from A must land at B, the only data being the speed of the airplane, the altitude and the orientation D of the course. The above data would be amply sufficient, were it not for the fact that the airplane is constantly subjected to a wind of variable direction and strength.
Contributing Partner: UNT Libraries Government Documents Department
Aerial navigation : on the problem of guiding aircraft in a fog or by night when there is no visibility

Aerial navigation : on the problem of guiding aircraft in a fog or by night when there is no visibility

Date: January 1, 1922
Creator: Loth, William
Description: The use of magnetic fields and wire to navigate aircraft in conditions of poor visibility is presented. This field may be considered to be derived from a double lemniscate, considered in the particular case where the origin is a double point formed from the magnetic field of the slack wire, from the field produced by the return currents and from the field due to the currents induced in the conducting mass. These fields are dephased in two ways, one in the direction of the wire, the other in a direction perpendicular to it.
Contributing Partner: UNT Libraries Government Documents Department
Aerial photography : obtaining a true perspective

Aerial photography : obtaining a true perspective

Date: April 1, 1923
Creator: unknown
Description: A demonstration was given within the last few days at the British Museum by Mr. J. W. Gordon, author of "Generalized Linear Perspective" (Constable and Co.), a work describing a newly-worked-out system by which photographs can be made available for the purpose of exactly recording the dimensions of the objects photographed even when the objects themselves are presented foreshortened in the photograph.
Contributing Partner: UNT Libraries Government Documents Department
Aerial transportation

Aerial transportation

Date: February 1, 1922
Creator: PIERROT
Description: The origin of air traffic dates from the war. The important development of aeronautic industries and the progress made in recent years, under the impelling force of circumstances, rendered it possible, after the close of hostilities, to consider the practical utilization of this new means of economic expansion.
Contributing Partner: UNT Libraries Government Documents Department
Aero dopes and varnishes

Aero dopes and varnishes

Date: July 1, 1927
Creator: Britton, H T S
Description: Before proceeding to discuss the preparation of dope solutions, it will be necessary to consider some of the essential properties which should be possessed of a dope film, deposited in and on the surface of an aero fabric. The first is that it should tighten the material and second it should withstand weathering.
Contributing Partner: UNT Libraries Government Documents Department