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Additional Test Data on Static Longitudinal Stability

Description: From Summary: "The purpose of this investigation was to explore the influence of weights of the controls on the stability with elevator released. The available test data were extended to stability with elevator locked. In this connection the study of the propeller effect seemed of vital importance."
Date: August 1934
Creator: Hübner, Walter
Item Type: Refine your search to only Report
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Aerodynamic principles of the direct lifting propeller

Description: From Summary: "The purpose of this report is to make the complicated processes on the direct-lift propeller amenable to analysis and observation. This is accomplished by placing the physical phenomena, starting with the most elementary process, in the foreground, while limiting the mathematical treatment to the most essential in view of the fundamental defects of the theorems. Comparison with model experiments supplements and corroborates the theoretical results."
Date: January 1934
Creator: Schrenk, Martin
Item Type: Refine your search to only Report
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Analysis of Spinning in a Monoplane Wing by the Induction Method as Compared With the Strip Method

Description: The problem of autorotation has been attacked by various authors, in particular Fuchs and Schmidt who applied the so-called strip method which is based upon the assumption that the forces and moments per unit length acting in each section of the wing are equal to those on an infinite cylindrical wing of equal section in an air flow of intensity and direction resulting from the apparent relative motion of this section with respect to the surrounding air. In other words they disregarded the induc… more
Date: June 1934
Creator: Poggi, L.
Item Type: Refine your search to only Report
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The Behavior Under Shearing Stress of Duralumin Strip With Round, Flanged Holes

Description: "This report presents the results of an investigation to determine the behavior of dural strip with flanged holes in the center when subjected to shear stresses. They buckle under a certain load just as a flat sheet. There is one optimum hole spacing and a corresponding buckling load in shear for each sheet width, sheet thickness, and flange form. Comparison with non-flanged sheets revealed a marked increase of buckling load in shear due to the flanging and a slightly greater displacement" (p. … more
Date: October 1934
Creator: Schüssler, Karl
Item Type: Refine your search to only Report
open access

The Calculation of Lateral Stability With Free Controls

Description: The discussion of the structural methods for obtaining lateral stability discloses the remarkable influence of the constant fuselage and wing proportions to the yawing moments. For the effectiveness of modifications in vertical tail surfaces and tail length, these quotas - little observed heretofore, in this connection - are decisive. This also applies to the amount of dihedral of the wing with regard to the roll stability of the complete wing already existing without angle of the dihedral.
Date: April 1934
Creator: Mathias, Gotthold
Item Type: Refine your search to only Report
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Contribution to the Mutual Interference of Wing and Propeller

Description: "The change of induced wing drag due to the field of flow of the propeller was analyzed quantitatively. The field of flow of the propeller is represented by a uniform distribution of sinks over the propeller disk area, whose strength is determined by the increase in speed in the slipstream. The superposition of this sink flow on the basic flow reproduces the actual field of flow outside of the slipstream with close approximation" (p. 1).
Date: September 1934
Creator: Wieselsberger, C.
Item Type: Refine your search to only Report
open access

Conversion of Energy in Cross-Sectional Divergences Under Different Conditions of Inflow

Description: "This investigation treats the conversion of energy in conically divergent channels with constant opening ratio and half included angle of from 2.6 to 90 degrees, the velocity distribution in the entrance section being varied from rectangular distribution to fully developed turbulence by changing the length of the approach. The energy conversion is not completed in the exit section of the diffuser; complete conversion requires a discharge length which depends upon the included angle and the vel… more
Date: March 1934
Creator: Peters, H.
Item Type: Refine your search to only Report
open access

Effect of Fuselage and Engine Nacelles on Some Aerodynamic Properties of an Airplane Wing

Description: "With the aid of the method of J. Lotz, the writer undertook to solve theoretically the lift distribution along the span of an airplane wing, when the outline of the wing is uneven. This problem arises in the case of a mid-wing monoplane with embedded engine nacelles. The fuselage and the nacelles were considered as aerodynamically profiled, that is, as lift-producing parts. The task was therefore to determine not only the disturbance caused by the fuselage and nacelles, but also their share in… more
Date: February 1934
Creator: Vladea, Joan
Item Type: Refine your search to only Report
open access

The Effect of Weight and Drag on the Sinking Speed and Lift/Drag Ratio of Gliders

Description: The most important factors in evaluating performance of gliders are minimum sinking speed and minimum gliding angle. To assure their optimum value the energy necessary for flight, that is, the energy of lift and friction must be kept very low, or in other words, weight and total drag which have a decisive effect on the sinking speed and on the gliding angle, must be kept to a minimum. How great the effect of a reduction of these two quantities will be shown in the following.
Date: December 1934
Creator: Kosin, R.
Item Type: Refine your search to only Report
open access

Evaluation of Scavenging in Two-Stroke-Cycle Engines

Description: The viewpoints are discussed, according to which the scavenging of two-stroke-cycle engines can be evaluated, and the relations between scavenging pressure and the quantity of the scavenging medium required, as also between the scavenging pressure and the revolution speed, are developed. It is further shown that the power increase is limited by the scavenging process, so that further researches are desirable for qualitative improvement. These results lead to several conclusions regarding the pr… more
Date: January 1934
Creator: Venediger, Herbert J.
Item Type: Refine your search to only Report
open access

Experiments with planing surfaces

Description: A previous report discusses the experimental program of a systematic exploration of all questions connected with the planing problem as well as the first fundamental results of the investigation of a flat planing surface. The present report is limited to the conversion of the model test data to full scale.
Date: March 1934
Creator: Sottorf, W.
Item Type: Refine your search to only Report
open access

Fatigue Strength of Airplane and Engine Materials

Description: This report was undertaken to give a brief summary of the laws governing the fatigue stresses and of the most important strength coefficients necessary for the correct dimensioning of the structural members. With consideration of the known fatigue strengths, the most important of which for airplane and engine materials are included in the paper, the fatigue strength of the structural parts can at least be approximately estimated.
Date: April 1934
Creator: Matthaes, Kurt
Item Type: Refine your search to only Report
open access

Impact Buckling of Thin Bars in the Elastic Range for Any End Condition

Description: "Following a qualitative discussion of the complicated process involved in a short-period, longitudinal force applied to an originally not quite straight bar, the actual process is substituted by an idealized process for the purpose of analytical treatment. The simplifications are: the assumption of an infinitely high rate of propagation of the elastic longitudinal waves in the bar, limitation to slender bars, disregard of material damping and of rotatory inertia, the assumption of consistently… more
Date: July 1934
Creator: Taub, Josef
Item Type: Refine your search to only Report
open access

Impact Buckling of Thin Bars in the Elastic Range Hinged at Both Ends

Description: "Following the development of the well-known differential equations of the problem and their resolution for failure in tension, the bending (transverse) oscillations of an originally not quite straight bar hinged at both ends and subjected to a constant longitudinal force (shock load) are analyzed. To this end the course of the bar form is expanded in a sinusoidal series, after which the investigation is carried through separately for the fundamental oscillation and the (n-1)the higher oscillat… more
Date: June 1934
Creator: Koning, Carel & Taub, Josef
Item Type: Refine your search to only Report
open access

Influence of Cut-Outs in Elevator on the Static Longitudinal Stability and on the Static Elevator Effect

Description: "The rudder effect of a sport airplane at high angles of attack was to be improved. This made it necessary to make a cut-out in the center of the continuous elevator so as to enlarge the rudder downward. This cut-out which reduced the rudder area by 12.5 percent changed the static stability of the airplane as well as the elevator effect" (p. 1).
Date: August 1934
Creator: Biechteler, Curt
Item Type: Refine your search to only Report
open access

Investigation of a Rateau Supercharger for a 700-Horsepower Airplane Engine

Description: The Rateau supercharger investigated had, under normal operating conditions, an adiabatic efficiency of 52 percent, the CINA constant-pressure altitude being 6,240 m and the corresponding CINA compression ratio being 2.22. In order to understand the flow conditions in the supercharger, the air velocities at various points, the theoretical delivery heads and a few characteristics were calculated.
Date: March 1934
Creator: Oestrich, Hermann
Item Type: Refine your search to only Report
open access

Investigation of boundary layers on an airplane wing in free flight

Description: "This report describes the equipment and method developed for recording the boundary layers on the surface of an airfoil in free flight. The results are in close agreement with the wind-tunnel tests of other experimenters. The intensity of the turbulent boundary layer, even at the much higher Reynolds Numbers reached, is determinable with Gruschwitz's formulas, although it was impossible to definitely establish a direct relationship between the turbulent boundary layer and the Reynolds Number w… more
Date: August 1934
Creator: Stüper, J.
Item Type: Refine your search to only Report
open access

The Processes in Spring-Loaded Injection Valves of Solid Injection Oil Engines

Description: "On the premise of a rectangular velocity wave arriving at the valve, the equation of motion of a spring-loaded valve stem is developed and analyzed. It is found that the stem oscillates, the oscillation frequency being consistently above the natural frequency of the nozzle stem alone, and whose amplitudes would increase in the absence of damping. The results are evaluated and verified on an example" (p. 1).
Date: November 1934
Creator: Lutz, O.
Item Type: Refine your search to only Report
open access

Safety and Design in Airplane Construction

Description: "The author gives a survey of the principles of stress analysis and design of airplane structures, and discusses the fundamental strength specifications and their effect on the stress analysis as compared with the safety factors used in other branches of engineering" (p. 1).
Date: October 1934
Creator: Teichmann, Alfred
Item Type: Refine your search to only Report
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