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 Decade: 1920-1929
 Collection: Technical Report Archive and Image Library
Practical method for balancing airplane moments

Practical method for balancing airplane moments

Date: February 1, 1924
Creator: Hamburger, H
Description: The present contribution is the sequel to a paper written by Messrs. R. Fuchs, L. Hopf, and H. Hamburger, and proposes to show that the methods therein contained can be practically utilized in computations. Furthermore, the calculations leading up to the diagram of moments for three airplanes, whose performance in war service gave reason for complaint, are analyzed. Finally, it is shown what conclusions can be drawn from the diagram of moments with regard to the defects in these planes and what steps may be taken to remedy them.
Contributing Partner: UNT Libraries Government Documents Department
Triplane tests

Triplane tests

Date: February 1, 1924
Creator: Wieselsberger, C
Description: These experiments were carried out to determine the aerodynamic characteristics of various triplanes, which differed in the relative positions of the wings and, more especially, in the stagger, and in the shape of the wing sections. The tests were restricted to such dispositions as appeared constructively adapted to the plan form considered. Four different sets of wings were used in these tests, three of which had the same cross-section but differed in aspect ratio and in area. The tests were made at an air velocity of about 30 m.p.s. (98.4 ft/sec.) in the large wind tunnel. Results are given in tabular and graphical form.
Contributing Partner: UNT Libraries Government Documents Department
Curvilinear flight of airplanes

Curvilinear flight of airplanes

Date: January 1, 1924
Creator: Salkowski, E
Description: None
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
A preliminary study of airplane performance

A preliminary study of airplane performance

Date: November 1, 1922
Creator: Norton, F H
Description: Flight tests were carried out at the Langley Field laboratory of the NACA, on several airplanes for the purpose of determining their relative performance with the same engine and the same propeller. The method used consisted in flying each airplane on a level course and measuring the airspeed for the whole range of engine revolutions. In general the results show that a small change in the wing section or the wing area has but a slight effect upon the performance, but changes in those parts which cause the structural resistance have a very important effect.
Contributing Partner: UNT Libraries Government Documents Department
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
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
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