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  Partner: UNT Libraries Government Documents Department
 Decade: 1920-1929
 Collection: National Advisory Committee for Aeronautics Collection
Spindled and hollow spars

Spindled and hollow spars

Date: October 1, 1926
Creator: Blyth, J D
Description: The most usual method of arriving at the maximum amount of spindling or hollowing out permissible in the case of any particular spar section is by trial and error, a process which is apt to become laborious in the absence of good guessing - or luck. The following tables have been got out with the object of making it possible to arrive with certainty at a suitable section at the first attempt.
Contributing Partner: UNT Libraries Government Documents Department
Spiral tendency in blind flying

Spiral tendency in blind flying

Date: August 1, 1929
Creator: Carroll, Thomas
Description: The flight path followed by an airplane which was being flown by a blindfolded pilot was observed and recorded. When the pilot attempted to make a straight-away flight there was a tendency to deviate from the straight path and to take up a spiral one.
Contributing Partner: UNT Libraries Government Documents Department
Spontaneous combustion of hydrogen

Spontaneous combustion of hydrogen

Date: December 1, 1923
Creator: Pothmann, PH & Nusselt, Wilhelm
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.
Contributing Partner: UNT Libraries Government Documents Department
Spray penetration with a simple fuel injection nozzle

Spray penetration with a simple fuel injection nozzle

Date: January 1, 1926
Creator: Miller, Harold E
Description: The purpose of the tests covered by this report was to obtain specific information on the rate of penetration of the spray from a simple injection nozzle, having a single orifice with a diameter of 0.015 inch when injecting into compressed gases. The results have shown that the effects of both chamber and fuel pressures on penetration are so marked that the study of sprays by means of high-speed photography or its equivalent is necessary if the effects are to be appreciated sufficiently to enable rational analysis. It was found for these tests that the negative acceleration of the spray tip is approximately proportional to the 1.5 power of the instantaneous velocity of the spray tip.
Contributing Partner: UNT Libraries Government Documents Department
Stability equations for airship hulls

Stability equations for airship hulls

Date: January 1, 1926
Creator: Zahm, A F
Description: In the text are derived simple formulae for determining, directly from the data of wind tunnel tests of a model of an airship hull, what shall be the approximate character of oscillation, in pitch or yaw, of the full-scale airship when slightly disturbed from steady forward motion. (author).
Contributing Partner: UNT Libraries Government Documents Department
Stability of airplanes

Stability of airplanes

Date: May 1, 1922
Creator: Warner, Edward P
Description: The author attempts to correct the misconception that piloting an airplane requires extraordinary skill and balance. He also tries to show that airplanes are extremely stable in flight. Some of the major points covered in this article include: automatic pilots, airplanes designed to be stable, and the reliance on mathematics to help in designing stable aircraft.
Contributing Partner: UNT Libraries Government Documents Department
Stability of the parachute and helicopter

Stability of the parachute and helicopter

Date: January 1, 1920
Creator: Batemen, H
Description: This report deals with an extension of the theory of stability in oscillation to the case of aircraft following a vertical trajectory, and particularly to the oscillations of parachutes.
Contributing Partner: UNT Libraries Government Documents Department
Stall-proof airplanes

Stall-proof airplanes

Date: January 1, 1927
Creator: Lachmann, G
Description: My lecture has to do with the following questions. Is the danger of stalling necessarily inherent in the airplane in its present form and structure, or can it be diminished or eliminated by suitable means? Do we possess such means or devices and how must they operate? In this connection I will devote special attention to the exhibition of stall-proof airplanes by Fokker under the auspices of the English Air Ministry, which took place in Croyden last April.
Contributing Partner: UNT Libraries Government Documents Department
Standard atmosphere

Standard atmosphere

Date: January 1, 1923
Creator: Gregg, Willis Ray
Description: This report was prepared at the request of the National Advisory Committee for Aeronautics and discusses the need of a standard set of values of pressure, temperature and density at various altitudes and points out the desirability of adopting such values as are most in accord with actual average conditions, in order that corrections in individual cases may be as small as possible. To meet this need, so far as the united states is concerned, all free-air observations obtained by means of kites and balloons at several stations in this country near latitude 40 degrees N., have been used, and average values of pressure, temperature, and density, based upon those observations, have been determined for summer, winter, and the year, and for all altitudes up to 20,000 meters (65,000 feet). These values are presented in tables and graphs in both metric and english units; and in the tables of densities there are also included values of density for other parts of the world, more particularly for Europe. A comparison with these values shows that, except in the lowest levels, the agreement is very satisfactory.
Contributing Partner: UNT Libraries Government Documents Department
Standard atmosphere - tables and data

Standard atmosphere - tables and data

Date: January 1, 1926
Creator: Diehl, Walter S
Description: Detailed tables of pressures and densities are given for altitudes up to 20,000 meters and to 65,000 feet. In addition to the tables the various data pertaining to the standard atmosphere have been compiled in convenient form for ready reference. This report is an extension of NACA-TR-147.
Contributing Partner: UNT Libraries Government Documents Department