Technical Report Archive & Image Library (TRAIL) - 1,438 Matching Results

Search Results

prev Results: 31 - 54 next
open access

Variable Pitch Propellers

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.
Date: November 1920
Creator: Bacon, D. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The "Universal" Adjustable and Reversible Propeller Built by Paragon Engineers, Inc., Baltimore, MD

Description: "A device which does for the aircraft what change speed gears do for the automobile is the invention of Spencer Heath. It comprises a system of special blades and a mechanism for varying the pitch of the blades from zero to 360 degrees, while in flight or otherwise. By adjusting the pitch, either before starting or while the engine is running, to a less than normal angle, the engine is allowed to pick up speed and deliver its maximum power which is necessary in taking-off with a heavier load th… more
Date: November 1922
Creator: Bacon, David L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The "Universal Propeller": Built by Paragon Engineers, Inc., Baltimore, MD.

Description: At the request of the N.A.C.A. the "Universal Propeller" was operated and explained by the inventor, Mr. Spencer Heath, for the purpose of demonstrating the following features of design: 1) Elimination of continuously running gears, collars or bearings in the pitch control mechanism; 2) The use of engine power in place of manual labor in changing blade angle; 3) The absence of any structural limitation to the range of blade angles available and the possibility of limiting the blade travel betwe… more
Date: March 1922
Creator: Bacon, David L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Measurements on a Low-Wing Model in the Rotating Jet and Comparison With Flight Measurements

Description: The present report deals with six-component measurements in the small tunnel of the DVL on a model of the BFW-M 27b(sub 1), which were made to determine the effect of rolling and yawing on the air forces and moments. The wind was given a spiral motion by means of a rotating screen, the model being suspended in the conventional manner. The lack of accuracy in the measurement of the rolling-yawing moments was very noticeable.
Date: September 1939
Creator: Bader, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evolution of the Helicopter

Description: Report presenting an investigation of problems related to helicopters. Also included are the history of the evolution of the helicopter and a series of propeller experiments.
Date: March 1923
Creator: Balaban, Karl
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Stability of Rectangular Plates With Longitudinal or Transverse Stiffeners Under Uniform Compression

Description: In the present paper, the complete buckling conditions of stiffened plates are being developed for uniform compression. We shall treat plates with one or two longitudinal or transverse stiffeners at any point, discuss the buckling conditions, and evaluate them for different cases.
Date: August 1939
Creator: Barbré, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Strength Calculations on Airplanes

Description: "Every strength calculation, including those on airplanes, must be preceded by a determination of the forces to be taken into account. In the following discussion, it will be assumed that the magnitudes of these forces are known and that it is only a question of how, on the basis of these known forces, to meet the prescribed conditions on the one hand and the practical requirements on the other" (p. 1).
Date: December 1925
Creator: Baumann, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Duralumin, Its Properties and Uses

Description: A historical sketch of duralumin is presented, especially in regards to its manufacture by various countries. The properties of duralumin are discussed and strength characteristics listed. Increasing the hardness of duralumin by tempering is discussed as well as the uses of the metal.
Date: October 1924
Creator: Beck, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Engine Pistons of Light Metal

Description: This report presents the results of testing 32 sets of light metal pistons from 16 different aluminum and magnesium alloys, 2 sets of cast iron pistons, and one piston of pure electrolytic copper. The many-fold mutual relations between material properties, shape, thermic and dynamic processes in the engine were clarified by comprehensive technical, thermic, chemical, physical and metallographic investigations of pistons and piston materials.
Date: June 1922
Creator: Becker, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Impact Waves and Detonation: Part 1

Description: "Among the numerous thermodynamic and kinetic problems that have arisen in the application of the gaseous explosive reaction as a source of power in the internal combustion engine, the problem of the mode or way by which the transformation proceeds and the rate at which the heat energy is delivered to the working fluid became very early in the engine's development a problem of prime importance. The work of Becker here given is a notable extension of earlier investigations, because it covers the… more
Date: March 1929
Creator: Becker, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Impact Waves and Detonation: Part 2

Description: A continuation of a previous technical memorandum regarding impact waves and detonation. This particular report focuses on the applications to detonation under several different conditions, including variations in pressure.
Date: March 1929
Creator: Becker, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Kinetic Treatment of the Nucleation in Supersaturated Vapors

Description: The equations of the individual processes of self nucleation are utilized through an electrical analogy to obtain the nucleation frequency. This process is shown to be shorter and less subject to error than that of previous investigators since the appearance of indeterminant integration constants is completely avoided. With the nucleation frequencies of crystals and spheres the Ostwald law of stages is reviewed and modified.
Date: September 1954
Creator: Becker, R. & Döring, Werner
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Flight of an Autogiro at High Speed

Description: This report presents a method for computing the flight performance of an autogiro at high speed, the velocity component along the blades being accounted for by calculation of the profile drag and the equation for zero torque.
Date: December 1933
Creator: Bennett, J. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Vertical Descent of the Autogiro

Description: The purpose of this report is to show that only part of the system of rotating blades really is in the "windmill decelerating attitude" when the profile drag is sufficiently low. This particular part receives more torque from the air loads than can be absorbed by the profile drag. As a result thereof the rotating autogiro blade, when its torque is zero, is in part a propeller which functions in the "annular vortex attitude.".
Date: June 1932
Creator: Bennett, J. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Designing Seaplane Hulls and Floats

Description: Experimental data, such as the results of tank tests of models, render it possible to predict, at least in principle, as to how a hull or float of a given shape will comport itself. We will see further along, however, how uncertain these methods are and how they leave room for empiricism, which will reign for a long time yet in seaplane research bureaus.
Date: August 1926
Creator: Benoit
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Some Experiences Regarding the Nonlinearity of Hot Wires

Description: "We compare here the results of some experiences with the formulas established in our preceding report 'Nonlinear Theory of a Hot-Wire Anemometer.' We shall show that the nonlinear term plays a role as important as the thermal conduction in the calculation of the thermal inertia of the hot wire" (p. 1).
Date: June 1952
Creator: Betchov, R. & Welling, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Axial Superchargers

Description: Improvements, however, have been attained which permit a shortening of the structure without any impairment of the efficiency. The axial supercharger has a better efficiency and a simpler design than the radial supercharger. The relatively narrow range in which it operates satisfactorily should not be a very disturbing factor for practical flight problems. The length of this type of supercharger may be reduced considerably if some impairment in the efficiency is permitted.
Date: August 1944
Creator: Betz, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Behavior of Vortex Systems

Description: Progressive application of the Kutta-Joukowsky theorem to the relationship between airfoil lift and circulation affords a number of formulas concerning the conduct of vortex systems. The application of this line of reasoning to several problems of airfoil theory yields an insight into many hitherto little observed relations. This report is confined to plane flow, hence all vortex filaments are straight and mutually parallel (perpendicular to the plane of flow).
Date: June 1933
Creator: Betz, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Considerations on Propeller Efficiency

Description: The propeller cannot be considered alone, but the mutual interference between propeller and airplane must be considered. These difficulties are so great when the joint action of propeller and airplane is considered, that the aerodynamic laboratory at Gottingen originally abandoned the idea of applying the efficiency conception of the test results. These difficulties and the methods by which they are overcome are outlined in this report.
Date: September 1928
Creator: Betz, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen