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 Decade: 1920-1929
 Collection: Technical Report Archive and Image Library
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