You limited your search to:

  Partner: UNT Libraries Government Documents Department
 Decade: 1920-1929
 Collection: Technical Report Archive and Image Library
Aerodynamic characteristics of airfoils at high speeds

Aerodynamic characteristics of airfoils at high speeds

Date: January 1, 1925
Creator: Briggs, L J; Hull, G F & Dryden, H L
Description: This report deals with an experimental investigation of the aerodynamical characteristics of airfoils at high speeds. Lift, drag, and center of pressure measurements were made on six airfoils of the type used by the air service in propeller design, at speeds ranging from 550 to 1,000 feet per second. The results show a definite limit to the speed at which airfoils may efficiently be used to produce lift, the lift coefficient decreasing and the drag coefficient increasing as the speed approaches the speed of sound. The change in lift coefficient is large for thick airfoil sections (camber ratio 0.14 to 0.20) and for high angles of attack. The change is not marked for thin sections (camber ratio 0.10) at low angles of attack, for the speed range employed. At high speeds the center of pressure moves back toward the trailing edge of the airfoil as the speed increases. The results indicate that the use of tip speeds approaching the speed of sound for propellers of customary design involves a serious loss in efficiency.
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic characteristics of airfoils III : continuation of reports nos. 93 and 124

Aerodynamic characteristics of airfoils III : continuation of reports nos. 93 and 124

Date: January 1, 1924
Creator: unknown
Description: This collection of data on airfoils has been made from the published reports of a number of the leading aerodynamic laboratories of this country and Europe. The information which was originally expressed according to the different customs of the several laboratories is here presented in a uniform series of charts and tables suitable for the use of designing engineers and for purposes of general reference. The absolute system of coefficients has been used, since it is thought by the National Advisory Committee for Aeronautics that this is the one most suited for international use and yet is one for which a desired transformation can be easily made. The authority for the results here presented is given as the name of the laboratory at which the experiments were conducted, with the size of the model, wind velocity, and date of test.
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic characteristics of airfoils IV : continuation of reports nos. 93, 124, and 182

Aerodynamic characteristics of airfoils IV : continuation of reports nos. 93, 124, and 182

Date: January 1, 1927
Creator: unknown
Description: This collection of data on airfoils has been made from the published reports of a number of the leading Aerodynamic Laboratories of this country and Europe. The information which was originally expressed according to the different customs of the several laboratories is here presented in a uniform series of charts and tables suitable for the use of designing engineers and for purposes of general reference. The authority for the results here presented is given as the name of the laboratory at which the experiments were conducted, with the size of the model, wind velocity, and year of test.
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic characteristics of airfoils V : continuation of reports nos. 93, 124, 182, and 244

Aerodynamic characteristics of airfoils V : continuation of reports nos. 93, 124, 182, and 244

Date: January 1, 1929
Creator: unknown
Description: This collection of data on airfoils has been made from published reports of a number of the leading aerodynamic laboratories of this country and Europe. The information which was originally expressed according to the different customs of the several laboratories is here presented in a uniform series of charts and tables suitable for the use of designing engineers and for purposes of general reference. The authority for the results here presented is given as the name of the laboratory at which the experiments were conducted, with the size of the model, wind velocity, and year of tests.
Contributing Partner: UNT Libraries Government Documents Department
The aerodynamic characteristics of seven frequently used wing sections at full Reynolds number

The aerodynamic characteristics of seven frequently used wing sections at full Reynolds number

Date: January 1, 1927
Creator: Munk, Max M & Miller, Elton W
Description: This report contains the aerodynamic properties of the wing sections U.S.A. 5, U.S.A. 27, U.S.A. 35 A, U.S.A. 35 B, Clark Y, R.A.F. 15, and Gottingen 387, as determined at various Reynolds numbers up to an approximately full scale value in the variable density wind tunnel of the National Advisory Committee for Aeronautics. It is shown that the characteristics of the wings investigated are affected greatly and in a somewhat erratic manner by variation of the Reynolds number. In general there is a small increase in maximum lift and an appreciable decrease in drag at all lifts.
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic characteristics of thin empirical profiles and their application to the tail surfaces and ailerons of airplanes

Aerodynamic characteristics of thin empirical profiles and their application to the tail surfaces and ailerons of airplanes

Date: December 1, 1928
Creator: Toussaint, A & Carafoli, E
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic computation of gliders

Aerodynamic computation of gliders

Date: September 1, 1922
Creator: Schrenk, M
Description: In the following discussion, a knowledge of the theoretical principles of airplane construction is assumed, as presented in detail by Vogt and Lippisch. A few quantities will however be otherwise designated, in accordance with the Gottingen symbols.
Contributing Partner: UNT Libraries Government Documents Department
The Aerodynamic Forces on Airship Hulls

The Aerodynamic Forces on Airship Hulls

Date: January 1, 1924
Creator: Munk, Max M
Description: This report describes the new method for making computations in connection with the study of rigid airship, which was used in the investigation of the navy's ZR-1 by the special subcommittee of the National Advisory Committee for Aeronautics appointed for this purpose. It presents the general theory of the air forces on airship hulls of the type mentioned, and an attempt has been made to develop the results from the very fundamentals of mechanics without reference to some of the modern highly developed conceptions, which may not yet be thoroughly known to readers uninitiated into modern aerodynamics, and which may, perhaps, for all time remain restricted to a small number of specialists.
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic laboratory at Cuatro Vientos

Aerodynamic laboratory at Cuatro Vientos

Date: September 1, 1922
Creator: JUBERA
Description: This report presents a listing of the many experiments in aerodynamics taking place at Cuatro Vientos. Some of the studies include: testing spheres, in order to determine coefficients; mechanical and chemical tests of materials; and various tests of propeller strength and flexibility.
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic laboratory at Cuatro Vientos

Aerodynamic laboratory at Cuatro Vientos

Date: June 1, 1927
Creator: Caracciolo, Moreno
Description: This report presents a description of the design of the Cuatro Vientes wind tunnel.
Contributing Partner: UNT Libraries Government Documents Department