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  Partner: UNT Libraries Government Documents Department
 Decade: 1920-1929
 Year: 1920
 Collection: National Advisory Committee for Aeronautics Collection
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
Fuselage stress analysis

Fuselage stress analysis

Date: January 1, 1920
Creator: Warner, Edward P & Miller, Roy G
Description: Report analyzes the stresses in a fuselage of the built-up type in which the shear is taken by diagonal bracing wires. Tests are conducted for landing, flying, and thrust loads.
Contributing Partner: UNT Libraries Government Documents Department
Wind tunnel balances

Wind tunnel balances

Date: January 1, 1920
Creator: Warner, Edward P & Norton, F H
Description: Report embodies a description of the balance designed and constructed for the use of the National Advisory Committee for Aeronautics at Langley Field, and also deals with the theory of sensitivity of balances and with the errors to which wind tunnel balances of various types are subject.
Contributing Partner: UNT Libraries Government Documents Department
Slip-stream corrections performance computation

Slip-stream corrections performance computation

Date: January 1, 1920
Creator: Warner, Edward P
Description: This report is an analysis of experiments performed by Eiffel on the air velocity in slip stream of a propeller, and also includes a theoretical discussion of the magnitude of the velocity in different propellers.
Contributing Partner: UNT Libraries Government Documents Department
Preliminary report on free flight tests

Preliminary report on free flight tests

Date: January 1, 1920
Creator: Warner, E P & Norton, F H
Description: Results are presented for a series of tests made by the Advisory Committee's staff at Langley Field during the summer of 1919 with the objectives of determining the characteristics of airplanes in flight and the extent to which the actual characteristics differ from those predicted from tests on models in the wind tunnel, and of studying the balance of the machines and the forces which must be applied to the controls in order to maintain longitudinal equilibrium.
Contributing Partner: UNT Libraries Government Documents Department
Bomb trajectories

Bomb trajectories

Date: January 1, 1920
Creator: Wilson, Edwin Bidwell
Description: The report is a mathematical treatise dealing with the trajectories of bombs of high terminal velocity, dropped from a great altitude.
Contributing Partner: UNT Libraries Government Documents Department
Construction of models for tests in wind tunnels

Construction of models for tests in wind tunnels

Date: January 1, 1920
Creator: Norton, F H
Description: Report deals with the methods of constructing aerofoils and all other parts of a model airplane, including discussion of the degree of accuracy.
Contributing Partner: UNT Libraries Government Documents Department
Theory of Lifting Surfaces, Part 2

Theory of Lifting Surfaces, Part 2

Date: August 1, 1920
Creator: Prandtl, L.
Description: A mathematical model is presented towards a theory of lifting and resistance on wings. It consists of a theory of multiplanes, conditions of flow at a great distance from the wing, lifting systems of minimum resistance, and free stream and stream limited by walls.
Contributing Partner: UNT Libraries Government Documents Department
Glues used in airplane parts

Glues used in airplane parts

Date: January 1, 1920
Creator: Allen, S W & Truax, T R
Description: This report was prepared for the National Advisory Committee for Aeronautics and presents the results of investigations conducted by the Forest Products Laboratory of the United States Forest Service on the manufacture, preparation, application, testing and physical properties of the different types of glues used in wood airplane parts.
Contributing Partner: UNT Libraries Government Documents Department
The effect of kiln drying on the strength of airplane woods

The effect of kiln drying on the strength of airplane woods

Date: January 1, 1920
Creator: Wilson, T R C
Description: This report is a very complete treatise on the comparative strength of air and kiln dried wood. The series of tests includes 26 species of wood, approximately 100 kiln runs, and over 10,000 mechanical tests.
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A study of airplane ranges and useful loads

A study of airplane ranges and useful loads

Date: January 1, 1920
Creator: Coffin, J G
Description: This report is an analysis of the maximum flight radii of typical large airplanes and a discussion of the way in which the possible length of flight is affected by the change of weight by consumption of fuel during the flight.
Contributing Partner: UNT Libraries Government Documents Department
Experimental research on air propellers III

Experimental research on air propellers III

Date: January 1, 1920
Creator: Durand, W F & Lesley, E P
Description: Report presents the results of wind tunnel tests of propellers that examined the influence of the following characteristics: (1) nominal pitch ratio 1.3 combined with a certain number of the more common or standard forms and proportions; (2) driving face slightly rounded or convex; (3) change in the location of the maximum thickness ordinate of the blade section; (4) pushing forward the leading edge of the blade, thus giving a rounded convex surface on the leading side of the driving face. (5) a series of values for the constant "angle of attack" in forming propellers with radially increasing pitch. In accordance with these purposes tests were carried out on 28 propellers.
Contributing Partner: UNT Libraries Government Documents Department
Supplies and production of aircraft woods

Supplies and production of aircraft woods

Date: January 1, 1920
Creator: Sparhawk, W N
Description: The purpose of this report is to present in brief form such information as is available regarding the supplies of the kinds of wood that have been used or seem likely to become important in the construction of airplanes, and the amount of lumber of each species normally put on the market each year. A general statement is given of the uses to which each kind of wood is or may be put.
Contributing Partner: UNT Libraries Government Documents Department
Notes on the theory of the accelerometer

Notes on the theory of the accelerometer

Date: May 1, 1920
Creator: Warner, E P
Description: None
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Notes on longitudinal stability and balance

Notes on longitudinal stability and balance

Date: April 1, 1920
Creator: Warner, E P
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Investigation of the muffling problem for airplane engines

Investigation of the muffling problem for airplane engines

Date: January 1, 1920
Creator: Upton, G. B. & Gage, V. R.
Description: The experimentation presented in this report falls in two divisions: first, the determination of the relation between back pressure in the exhaust line and consequent power loss, for various combinations of speed and throttle positions of the engine; second, the construction and trial of muffler designs covering both type and size. Report deals with experiments in the development of a muffler designed on the principle which will give the maximum muffling effect with a minimum loss of power. The main body of the work has been done on a Curtiss OX eight-cylinder airplane engine, 4 by 5 inches, rated 70 horsepower at 1,200 revolutions per minute. For estimation of the muffling ability and suppression of "bark" of individual exhausts, the "Ingeco" stationary, single cylinder, 5 1/2 by 10 inch, throttling governed gasoline engine, and occasionally other engines were used.
Contributing Partner: UNT Libraries Government Documents Department
The problem of the helicopter

The problem of the helicopter

Date: May 1, 1920
Creator: Warner, E P
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Static testing and proposed standard specifications

Static testing and proposed standard specifications

Date: July 1, 1920
Creator: Warner, E P
Description: Static tests fall into two groups, the first of which is designed to load all members of the structure approximately in accordance with the worst loads which they carry in flight, while the second is directed to the testing of specific members which are suspected of weakness and which are difficult to analyze mathematically. The nature of the loading in the second type is different for every different test, but the purpose of the first is defined clearly enough to permit the adoption of some standard set of loading specifications, at least for airplanes of normal design. Here, an attempt is made to carry through an analysis leading to such a standard, the goal being the determination of a load which will simultaneously impose on every member of the airplane structure a stress equal to the worst it will carry in flight.
Contributing Partner: UNT Libraries Government Documents Department
The photographic recording of small motions

The photographic recording of small motions

Date: November 1, 1920
Creator: Norton, F H
Description: Methods and equipment for recording small and sometimes rapid motions by photographic means are described, and the efficacy of photographic recording in such instances is evaluated. The optical system consisting of the light source, the mirror or prism for transmitting motion to the emergent beam, and a means of bringing the rays into focus on the film are discussed. Attention is given to the critical issue of mirror mounting. The film holder and the driving motor for the recording drum are described in detail. The authors conclude that the optical methods they describe are far more satisfactory than the recording pen, in compactness, in high natural period, and in elimination of friction. Costs are similar to mechanical methods. The development and reproduction of the record is an added complication, but the ease of duplicating the records is a decided advantage.
Contributing Partner: UNT Libraries Government Documents Department
Soaring flight in Guinea

Soaring flight in Guinea

Date: August 1, 1920
Creator: Idrac, P
Description: The term soaring is applied here to the flight of certain large birds which maneuver in the air without moving their wings. The author explains the methods of his research and here gives approximate figures for the soaring flight of the Egyptian Vulture and the African White backed Vulture. Figures are given in tabular form for relative air speed per foot per second, air velocity per foot per second, lift/drag ratio, and selected coefficients. The author argues that although the figures given were taken from a very limited series of observations, they have nevertheless thrown some light on the use by birds of the internal energy of the air.
Contributing Partner: UNT Libraries Government Documents Department
An Introduction to the Laws of Air Resistance of Aerofoils

An Introduction to the Laws of Air Resistance of Aerofoils

Date: January 1, 1920
Creator: De Bothezat, George
Description: Report presents methods of calculating air resistance of airfoils under certain conditions of flow phenomena around the airfoil.
Contributing Partner: UNT Libraries Government Documents Department
Experimental research on air propellers II

Experimental research on air propellers II

Date: January 1, 1920
Creator: Durand, William F & Lesley, E P
Description: This report is a continuation of NACA Technical Report 14. It presents the results of an experimental investigation on the performance of air propellers which was divided into five parts, as follows: (1) Tests under conditions of flight on 16 model propellers of different forms, sections, or pitch ratios from those of Technical Report 14; (2) Tests under conditions of flight on one model propeller of variable pitch; (3) Tests under conditions of flight on three sets of right and left hand model propellers in series; (4) Tests on 12 model propellers to determine brake effect or negative thrust at negative slip; (5) Standing thrust and power tests of 67 model propellers.
Contributing Partner: UNT Libraries Government Documents Department
A study of airplane engine tests

A study of airplane engine tests

Date: January 1, 1920
Creator: Gage, Victor R
Description: This report is a study of the results obtained from a large number of test of an Hispano-Suiza airplane engine in the altitude laboratory of the Bureau of Standards. It was originally undertaken to determine the heat distribution in such an engine, but many other factors are also considered as bearing on this matter.
Contributing Partner: UNT Libraries Government Documents Department
A new process for the production of aircraft-engine fuels

A new process for the production of aircraft-engine fuels

Date: January 1, 1920
Creator: Paris, Auguste Jean, Jr & Paris, W Francelyn
Description: Report describes experiments conducted on a new method of producing high-grade aviation gasoline at a test laboratory established at Charleston, W. Va. For the National Advisory Committee for Aeronautics.
Contributing Partner: UNT Libraries Government Documents Department
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