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 Decade: 1920-1929
 Collection: Technical Report Archive and Image Library
Notes on aerodynamic forces II : curvilinear motion

Notes on aerodynamic forces II : curvilinear motion

Date: July 1, 1922
Creator: Munk, Max M
Description: The laws of curvilinear motion are established and the transverse forces on elongated airship hulls along a curved path are investigated.
Contributing Partner: UNT Libraries Government Documents Department
Downwash of airplane winds

Downwash of airplane winds

Date: January 1, 1923
Creator: Munk, Max & Cario, Gunther
Description: The data for the calculation of the air forces acting on the elevators, obtained from previous model experiments are not immediately applicable in practice, as the angle at which the control surfaces meet the air stream is, in general, still unknown. The air stream, when it reaches the elevator has already been deflected by the wings and although the velocity imparted to the air current by the wings is of negligible amount compared with the speed of flight, the air behind the wings has been deflected downwards, so that the elevators work in an airstream which is inclined in a downward direction. The angle at which the air stream meets the elevator surface is, therefore, different from, and, with the usual arrangement of elevators, less than the angle made by the elevator surfaces with the line of flight.
Contributing Partner: UNT Libraries Government Documents Department
The determination of the angles of attack of zero lift and of zero moment, based on Munk's integrals

The determination of the angles of attack of zero lift and of zero moment, based on Munk's integrals

Date: January 1, 1923
Creator: Munk, Max M
Description: The integration is accomplished by the use of the mean camber of the section at particularly selected points. Simple graphical constructions of the zero directions are derived from the results.
Contributing Partner: UNT Libraries Government Documents Department
Notes on aerodynamic forces 1 : rectilinear motion

Notes on aerodynamic forces 1 : rectilinear motion

Date: July 1, 1922
Creator: Munk, Max M
Description: The study of the motion of perfect fluids is of paramount importance for the understanding of the chief phenomena occurring in the air surrounding an aircraft, and for the numerical determination of their effects. The author recently successfully employed some simple methods for the investigation of the flow of a perfect fluid that have never been mentioned in connection with aeronautical problems. These methods appeal particularly to the engineer who is untrained in performing laborious mathematical computations, as they do away with these and allow one to obtain many interesting results by the mere application of some general and well-known principles of mechanics. Discussed here are the kinetic energy of moving fluids, the momentum of a body in a perfect fluid, two dimensional flow, three dimensional flow, and the distribution of the transverse forces of very elongated surfaces of revolution.
Contributing Partner: UNT Libraries Government Documents Department
Further information on the laws of fluid resistance

Further information on the laws of fluid resistance

Date: December 1, 1922
Creator: Wieselsberger, C
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The use of multiplied pressures for automatic altitude adjustments

The use of multiplied pressures for automatic altitude adjustments

Date: January 1, 1922
Creator: Sparrow, Stanwood S
Description: The efficient performance of an airplane requires that certain adjustments be made as the density of the air through which the airplane passes changes. The safety of the over-dimensioned aircraft engine depends upon careful manipulation of spark advance and throttle opening and a proper control of a variable pitch propeller, if the maximum performance of the supercharged engine is to be obtained. It is evident that there is a real need for satisfactory devices to make such adjustments automatically. Discussed here is a method of automatic compensation which deserves consideration in the design of such devices. Existing schemes for automatic compensation all depend upon some contrivance which functions primarily because of changes in atmospheric pressure. In these devices a leak in the supposedly tight chamber means utter failure. The elimination of this source of danger is one of the aims of the method of altitude compensation described here. The change suggested is to make the source of operation the difference between atmospheric pressure and some multiple of atmospheric pressure instead of the difference between the atmospheric pressure and that of the gas confined in a tight chamber. The design of a device based on this method of altitude compensation is ...
Contributing Partner: UNT Libraries Government Documents Department
Notes on aerodynamic forces III : the aerodynamic forces on airships

Notes on aerodynamic forces III : the aerodynamic forces on airships

Date: July 1, 1922
Creator: Munk, Max M
Description: The results of the two preceding notes are applied to airships and checked with wind tunnel tests.
Contributing Partner: UNT Libraries Government Documents Department
Structural safety during curved flight

Structural safety during curved flight

Date: August 1, 1922
Creator: Rohrbach, Adolf
Description: None
Contributing Partner: UNT Libraries Government Documents Department
An optical altitude indicator for night landing

An optical altitude indicator for night landing

Date: January 1, 1923
Creator: Warner, John A C
Description: One of the most ingenious of the devices intended for use in night landing, especially emergency landing, is a very simple optical instrument known as the Jenkins night altitude indicator. The design and operation of this instrument, which allows a pilot to determine the altitude of the aircraft, is discussed. The author discusses various modifications and improvements that might be made to the instrument.
Contributing Partner: UNT Libraries Government Documents Department
Note on the resistance of polished cylinders (and cylindrical wires) with generatrices perpendicular to the airstream

Note on the resistance of polished cylinders (and cylindrical wires) with generatrices perpendicular to the airstream

Date: February 1, 1921
Creator: Toussaint, A
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Fittings and other structural parts of airplanes

Fittings and other structural parts of airplanes

Date: October 1, 1923
Creator: Eydam, P
Description: The strength and reliability of airplanes depend greatly on the careful design and manufacture of fittings, couplings, and other highly stressed parts. The more important parts of the airplane must be occasionally tested for increased loads and in order to avoid the possibility of defects creeping in during subsequent production. Strength tests are discussed for fittings for wing spar joints, fittings for strut connections, internal bracing, control gear, and landing gear.
Contributing Partner: UNT Libraries Government Documents Department
Significance of the expression C(sub L)(exp 3)/C(sub D)(exp 2)

Significance of the expression C(sub L)(exp 3)/C(sub D)(exp 2)

Date: January 1, 1924
Creator: Von Sanden, H
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The increase in dimensions of airplanes - weight, area, and loading of wings

The increase in dimensions of airplanes - weight, area, and loading of wings

Date: March 1, 1923
Creator: Everling, E
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The Nichols wing cutting equipment

The Nichols wing cutting equipment

Date: December 1, 1923
Creator: Ford, James B
Description: Described here is wing cutting equipment for the economical production of metal wings for wind tunnel models. The machine will make any size of constant-section wing or strut up to one-sixth inch chord by 36-inch span and up to a thickness of one and one-quarter inches. It cuts a smooth, true model that is accurate to within two-thousandths of an inch on any ordinate. The holding jaws are so designed as to leave the model free of chip marks, and the only hand finishing necessary after the cutting is a rub with amunite to remove burrs. The actual change on ordinate in this finishing rub is less than .0002 inches.
Contributing Partner: UNT Libraries Government Documents Department
The induction factor used for computing the rolling moment due to the ailerons

The induction factor used for computing the rolling moment due to the ailerons

Date: April 1, 1924
Creator: Munk, Max M
Description: In the following note, prepared for the National Advisory Committee for Aeronautics, this induction factor is determined from the result of a model test, and compared with a formula recently developed by the author. The two results are found to be in substantial agreement.
Contributing Partner: UNT Libraries Government Documents Department
Preliminary study of the damping factor in roll

Preliminary study of the damping factor in roll

Date: October 1, 1923
Creator: Shoemaker, James M & Lee, John G
Description: This paper constitutes a general theoretical discussion of the damping factor in roll, together with the results of wind tunnel tests on the continuous rolling of U.S.A. 30 airfoil.
Contributing Partner: UNT Libraries Government Documents Department
The small diesel engine as an automotive engine

The small diesel engine as an automotive engine

Date: September 1, 1921
Creator: Frey, Ernst
Description: Essential principles for building small diesel engines and also structural details so far as feasibility are presented.
Contributing Partner: UNT Libraries Government Documents Department
Large German airship stations

Large German airship stations

Date: August 1, 1921
Creator: Sabatier, J
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The velocity distribution caused by an airplane at the points of a vertical plane containing the span

The velocity distribution caused by an airplane at the points of a vertical plane containing the span

Date: March 1, 1925
Creator: Munk, Max M
Description: A formula for the computation of the vertical velocity component on all sides of an airplane is deduced and discussed. The formation is of value for the interpretation of such free flight tests where two airplanes fly alongside each other to facilitate observation.
Contributing Partner: UNT Libraries Government Documents Department
Tension experiments on diaphragm metals

Tension experiments on diaphragm metals

Date: August 1, 1927
Creator: Henrickson, H B
Description: Strips of german silver, steel, copper, duralumin, nickel and brass were tested in tension in an apparatus in which the change in deflection with time was measured by means of an interferometer. This change in deflection with time caused by the application and removal of a load is defined as "drift" and "recovery," respectively. It was measured in the time interval from approximately 5 seconds to 5 hours after loading. The data are given in a series of graphs in which the drift and recovery are plotted against time. The proportional drift and recovery in five hours are given for a number of the tests, and in addition are shown graphically for nickel and steel.
Contributing Partner: UNT Libraries Government Documents Department
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.
Contributing Partner: UNT Libraries Government Documents Department
Shape and strength of seaplane under-structures with special regard to seaworthiness

Shape and strength of seaplane under-structures with special regard to seaworthiness

Date: August 1, 1921
Creator: Lewe, Victor
Description: This report presents experiments and calculations for the purpose of determining the landing gear requirements upon the water. Moving pictures are given which furnish data and also may give both the magnitude and direction of the forces acting. Different classes of seaplanes are examined and proposals for calculation instructions are given.
Contributing Partner: UNT Libraries Government Documents Department
High efficiency of seaplanes

High efficiency of seaplanes

Date: August 1, 1921
Creator: Pegna, G
Description: A table is presented which includes data for calculating the index of efficiency. The author uses this data to conclude that seaplanes cannot be considered inferior to terrestrial airplanes.
Contributing Partner: UNT Libraries Government Documents Department
Preliminary calculation of cylinder dimensions for aircraft engines

Preliminary calculation of cylinder dimensions for aircraft engines

Date: September 1, 1921
Creator: Schwager, Otto
Description: It is extremely important in building aircraft engines to determine the requisite cylinder dimensions as accurately as possible, in order that the weight required for a given power shall not be excessive. This report presents a calculation method that depends on the air requirement of the fuel.
Contributing Partner: UNT Libraries Government Documents Department