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  Partner: UNT Libraries Government Documents Department
 Serial/Series Title: NACA Technical Memorandums
 Collection: Technical Report Archive and Image Library
On the elementary relation between pitch, slip, and propulsive efficiency

On the elementary relation between pitch, slip, and propulsive efficiency

Date: July 1, 1920
Creator: Froude, W
Description: The author examines the current theory on the importance of reducing slip in airplane propellers. The author feels an exaggerated importance is attached to this supposition and feels that the increase in friction by an increase in propeller area or number of revolutions can't be discounted.
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Recent developments in light alloys

Recent developments in light alloys

Date: November 1, 1920
Creator: Woodward, R W
Description: This report is intended to cover the progress that has been made in both the manufacture and utility of light alloys in the United States since the first part of 1919. Duralumin is extensively discussed both as to manufacture and durability.
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Tests of artificial flight at high altitudes

Tests of artificial flight at high altitudes

Date: November 1, 1920
Creator: Gradenwitz, Arthur
Description: If we wish to form an accurate idea of the extraordinary progress achieved in aeronautics, a comparison must be made of the latest altitude records and the figures regarded as highest attainable limit some ten years ago. It is desirable, for two reasons, that we should be able to define the limit of the altitudes that can be reached without artificial aid. First, to know to what extent the human body can endure the inhalation of rarified air. Second, the mental capacity of the aviator must be tested at high altitudes and the limit known below which he is able to make reliable observations without being artificially supplied with oxygen. A pneumatic chamber was used for the most accurate observations.
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Variable pitch propellers

Variable pitch propellers

Date: November 1, 1920
Creator: unknown
Description: In this report are described four different types of propellers which appeared at widely separated dates, but which were exhibited together at the last Salon de l'Aeronautique. The four propellers are the Chaviere variable pitch propeller, the variable pitch propeller used on the Clement Bayard dirigible, the variable pitch propeller used on Italian dirigibles, and the Levasseur variable pitch propeller.
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Dependence of propeller efficiency on angle of attack of propeller blade

Dependence of propeller efficiency on angle of attack of propeller blade

Date: January 1, 1921
Creator: Borck, Hermann
Description: In order to determine the maximum and the most favorable pitch for a propeller, it was found desirable to investigate the dependence of propeller efficiency on the angle of attack of the propeller blade. The results of a few experiments are given to show that propeller blades conduct themselves just like airplane wings with reference to the dependence of their efficiency on their angle of attack.
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The Oehmichen Peugeot helicopter

The Oehmichen Peugeot helicopter

Date: January 1, 1921
Creator: unknown
Description: The first flights of the Oehmichen helicopter are detailed as well as various aspects of the construction.
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Study of the resistance offered by propellers rotating on an airstream

Study of the resistance offered by propellers rotating on an airstream

Date: January 1, 1921
Creator: Lame, M
Description: This report presents a series of tests conducted to verify the formula for thrust P = q(exp 2) D(exp 2) V(exp 2), where P represents thrust, V the velocity of the airstream, D the diameter of the propeller, and q the lifting quality of a comparative propeller which is called the conjugate propeller.
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Commercial aviation in Germany : past and future

Commercial aviation in Germany : past and future

Date: February 1, 1921
Creator: Wronsky, W
Description: This review of commercial aviation includes postal delivery, package transport, and passenger transport. Both airplanes and airships are covered in this review.
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Abacus giving the variation of the mean pressure of an aviation engine as a function of its speed of rotation

Abacus giving the variation of the mean pressure of an aviation engine as a function of its speed of rotation

Date: March 1921
Creator: Margoulis, W
Description: Comparing the results of the calculations for computing the mean pressure of an aviation engine for any number of revolutions, with those of experiment, the writer, by numerous examples, shows the perfect agreement between them. This report will show that, by means of a special abacus, an engineer can instantly plot the characteristics of an engine.
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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.
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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.
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The Goebel rotary engine

The Goebel rotary engine

Date: March 1, 1921
Creator: unknown
Description: This report presents a table of specifications of the rotary engine and a very brief description of some of the notable features such as the exhaust valves controlled by means of a fixed cam gear.
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The law relating to air currents

The law relating to air currents

Date: March 1, 1921
Creator: unknown
Description: In the subdivided wing section profile, the diagram of the current is entirely changed and the harmful formation of eddies is avoided through premature deflection. Pressure equalization does not occur between the upper and under sides. This report presents a discussion of the various laws relating to wing design with the conclusion being that lift increases with more acute angles of attack.
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The Rumpler passenger airplane

The Rumpler passenger airplane

Date: March 1, 1921
Creator: Langsdorff, Werner V
Description: This report details the Rumpler Limousine which was a further development of the well known type 5 A 2. The fuselage, engine, cabin, wings, controls, and landing gear are all discussed.
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Development of aeronautical engines by the Army and Navy

Development of aeronautical engines by the Army and Navy

Date: March 3, 1921
Creator: unknown
Description: Different aircraft engines are categorized as being of interest to only the Army or Navy or to both armed services. A listing of the different engines is presented along with some statistics, namely, horsepower.
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The coupling of engines

The coupling of engines

Date: April 1, 1921
Creator: Boccaccio, Paul
Description: This report examines the idea of coupling numerous engines together to turn a single propeller, which the author feels would free aircraft design from the problems of multi-engine and propeller design.
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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.
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Rates for flights organized by the state

Rates for flights organized by the state

Date: April 1, 1921
Creator: unknown
Description: None
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Resume of the theory of naval and aerial propulsive propellers and of airplanes in the rectilinear flight

Resume of the theory of naval and aerial propulsive propellers and of airplanes in the rectilinear flight

Date: April 1, 1921
Creator: Rateau, A
Description: Though dissimilar, these two subjects have been united because they have some points in common. The computation of the movement of an airplane can only be correctly established if we are in a position to know exactly the thrust and resisting torque of the propeller for the various values of slip, which may vary greatly according to circumstance. The first part of the work concerns propellers and introduces as a fundamental variable, the true slip (delta) with respect to the effective pitch, which is the advance per revolution of the propeller corresponding to no thrust. The second part deals with characteristic curves of an airplane.
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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
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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.
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The technical development of the transport airplane.Report of the Aero-Technical Conference of the Scientific Association for Aeronautics, March 5, 1919

The technical development of the transport airplane.Report of the Aero-Technical Conference of the Scientific Association for Aeronautics, March 5, 1919

Date: April 1, 1921
Creator: unknown
Description: The abolition of military qualifications gives free scope to new technical possibilities in the development of transport airplanes. This report notes the various considerations that must be made when designing aircraft to meet the needs of commercial passengers. Comfort and safety must be emphasized.
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Transport airplanes

Transport airplanes

Date: April 1, 1921
Creator: Rohbach, A K
Description: None
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British certificates of airworthiness

British certificates of airworthiness

Date: May 1, 1921
Creator: unknown
Description: This report details the rules and regulations for obtaining a British airworthiness certificate. Aircraft loading and construction are especially important.
Contributing Partner: UNT Libraries Government Documents Department
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