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  Partner: UNT Libraries Government Documents Department
 Decade: 1920-1929
 Serial/Series Title: NACA Technical Memorandums
 Collection: National Advisory Committee for Aeronautics Collection
Handley Page metal construction

Handley Page metal construction

Date: October 1, 1929
Creator: unknown
Description: In this report Handley Page construction techniques are shown such as: solid-drawn tubular duralumin spars are used in the stabilizer; plain channel sections are used extensively for minor components; and the manner of assembling them into a stabilizer compression strut is shown.
Contributing Partner: UNT Libraries Government Documents Department
Evolution of the helicopter

Evolution of the helicopter

Date: March 1, 1923
Creator: Balaban, K.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Change of 180 degrees in the direction of a uniform current of air

Change of 180 degrees in the direction of a uniform current of air

Date: February 1, 1926
Creator: Witoszynski, C
Description: In the construction of aerodynamic tunnels, it is a very important matter to obtain a uniform current of air in the sections where measurements are to be made. The straight type ordinarily used for attaining a uniform current and generally recommended for use, has great defects. If we desire to avoid these defects, it is well to give the canals of the tunnel such a form that the current, after the change of direction of its asymptotes, approximates a uniform and rectilinear movement. But for this, the condition must be met that at no place does the flow exceed the maximum velocity assumed, equal to the velocity in the straight parts of the canal.
Contributing Partner: UNT Libraries Government Documents Department
The art of writing scientific reports

The art of writing scientific reports

Date: March 1, 1921
Creator: Norton, F H
Description: As the purpose of the report is to transmit as smoothly and as easily as possible, certain facts and ideas, to the average person likely to read it, it should be written in a full and simple enough manner to be comprehended by the least tutored, and still not be boring to the more learned readers.
Contributing Partner: UNT Libraries Government Documents Department
The "Universal propeller": built by Paragon Engineers, Inc., Baltimore, Md

The "Universal propeller": built by Paragon Engineers, Inc., Baltimore, Md

Date: March 1, 1922
Creator: Bacon, David L
Description: At the request of the N.A.C.A. the "Universal Propeller" was operated and explained by the inventor, Mr. Spencer Heath, for the purpose of demonstrating the following features of design: 1) Elimination of continuously running gears, collars or bearings in the pitch control mechanism; 2) The use of engine power in place of manual labor in changing blade angle; 3) The absence of any structural limitation to the range of blade angles available and the possibility of limiting the blade travel between any two predetermined extreme positions; 4) Continuous indication on the instrument board of the blade position; 5) Automatic throttling of the engine while the propeller is passing through the position of neutral pitch.
Contributing Partner: UNT Libraries Government Documents Department
Calculation of wing spars

Calculation of wing spars

Date: August 1, 1921
Creator: Muller-Breslau, H
Description: The author presents a comparison and combination of the numerical and geometrical determinations of the maximum M, when calculating the maximum bay moment.
Contributing Partner: UNT Libraries Government Documents Department
The constructional design of metal flying-boat hulls. Part I

The constructional design of metal flying-boat hulls. Part I

Date: November 1, 1928
Creator: Langley, M
Description: None
Contributing Partner: UNT Libraries Government Documents Department
"Gloster" high lift biplane wings

"Gloster" high lift biplane wings

Date: December 1, 1927
Creator: Preston, H E
Description: The main object of these wings was to obtain a high lift without increasing the total drag, and the idea was conceived that, by using a deep high-lift section for the top wing and a medium section for the bottom wing, the mutual interference between the two would be such as to give greater efficiency of the combination as compared with two wings of equal section.
Contributing Partner: UNT Libraries Government Documents Department
Increasing lift by releasing compressed air on suction side of airfoil

Increasing lift by releasing compressed air on suction side of airfoil

Date: December 1, 1927
Creator: Seewald, F
Description: The investigation was limited chiefly to the region of high angles of attack since it is only in this region that any considerable change in the character of the flow can be expected from such artificial aids. The slot, through which compressed air was blown, was formed by two pieces of sheet steel connected by screws at intervals of about 5 cm. It was intended to regulate the width of the slot by means of these screws. Much more compressed air was required than was originally supposed, hence all the delivery pipes were much too small. This experiment, therefore, is to be regarded as only a preliminary one.
Contributing Partner: UNT Libraries Government Documents Department
Glider construction and design

Glider construction and design

Date: October 1, 1927
Creator: Gymnich, Alfried
Description: The endeavor to draw a strict line between gliders and soarers as been recently abandoned and the following classification adopted: 1) gliders controlled by shifting the weight of the body; 2) gliders controlled by rudders; 3) gliders controlled by wings. The different classes are discussed as well as materials and parts used in construction.
Contributing Partner: UNT Libraries Government Documents Department
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