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Landing and Braking of Airplanes

Description: In the numerical examples, we have considered an airplane landing in calm air in a fixed direction after crossing the border (with its obstacles) at a height of 30 m. Its stopping point is at a distance D from the obstacle, comprising: a distance D(sub 1) in regular gliding flight; a distance D(sub 2) in levelling off; a distance D(sub 3) in taxying on the ground. The calculations enable us to make out the following table, which gives an idea of the improvements to be expected in the use of var… more
Date: April 1929
Creator: Breguet, Louis
Item Type: Refine your search to only Report
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Law of Similitude for the Surface Resistance of Lacquered Planes Moving in a Straight Line Through Water

Description: The proof of the validity of the Reynolds law of similitude for the surface resistance of planes has been developed with an accuracy hitherto unattained and for a large range of lengths and speeds. It has been shown that, in addition to the form resistance, the resistance of the longitudinal edges must be taken into account.
Date: April 1925
Creator: Gebers, Friedrich
Item Type: Refine your search to only Report
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The Lead Susceptibility of Fuels and Its Dependence on the Chemical Composition

Description: The fact that by the use of tetraethyl lead a number of otherwise unsuitable fuels could be made to meet engine requirements was not sufficiently appreciated. While use of tetraethyl lead is limited, the addition of special leaded fuels that increase the octane number is a requirement for many fuels. In this connection, the extent to which the action of tetraethyl lead through the addition of knock-resistant hydrocarbons to the base gasoline is influenced, is quite important. To the elucidation… more
Date: April 1940
Creator: Widmaier, O.
Item Type: Refine your search to only Report
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The Lift Distribution of Wings With End Plates

Description: The object of the present report is to ascertain the relationship of the circulation distribution over the wing and of the lift to the height and position of the end plate. The side forces and moments on the end plates were also determined. It is found that moving an end plate of certain length up from the symmetrical position, is followed by a slight increase of the total lift.
Date: April 1938
Creator: Mangler, W.
Item Type: Refine your search to only Report
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Light Aeroplane Engine Development

Description: "It has frequently been stated and written that in order to popularize light aircraft the first essential is the production of a reliable engine capable of being easily maintained and having a long life, at the same time selling at a low figure. It is desired to point out the difficulties in the way of realizing this ideal before remarking on the claims of the various types for adoption" (p. 1).
Date: April 1925
Creator: Fell, L. F. R.
Item Type: Refine your search to only Report
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The Light Airplane

Description: This report begins with a review and analysis of the work being done to develop light airplanes in the U.S. and abroad. A technical discussion of the construction and innovations in light airplanes is then presented.
Date: April 1925
Creator: Driggs, Ivan H.
Item Type: Refine your search to only Report
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The Load Distribution in Bolted or Riveted Joints in Light-Alloy Structures

Description: "This report contains a theoretical discussion of the load distribution in bolted or riveted joints in light-alloy structures which is applicable not only for loads below the limit of proportionality but also for loads above this limit. The theory is developed for double and single shear joints. The methods given are illustrated by numerical examples and the values assumed for the bolt (or rivet) stiffnesses are based partly on theory and partly on known experimental values" (p. 1).
Date: April 1947
Creator: Vogt, F.
Item Type: Refine your search to only Report
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Loss of the Dixmude

Description: The causes of the destruction of the Dixmude are discussed and some conclusions are drawn. The author believes a gasoline fire instead of a lightning strike was probably responsible, but the public believes otherwise.
Date: April 1924
Creator: Eckener, Hugo
Item Type: Refine your search to only Report
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[Memorandums on the Subject of Wind Tunnel Measurements of the Henschel Missile "Zitterrochen"]

Description: "At the request of the Henschel Aircraft Works. A. G. Berlin. three models of the missile "Zitterrochen" were investigated at subsonic velocities.(open jet 215-millimeter diameter) and at supersonic velocities (open jet 110 by 130 millimeters) in order to determine the effect of various wing forms on the air forces and moments. Three-component measurements were taken, and one model was also investigated with deflected control plates" (p. 1).
Date: April 1948
Creator: Weber & Kehl
Item Type: Refine your search to only Report
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Metal Construction

Description: The future development of aerial navigation is closely connected with the condition of obtaining airplanes of great stability and sufficient strength. Different construction materials such as wood, aluminum, iron, and alloys are examined to determine which materials or combination of materials provides a greater coefficient of safety.
Date: April 1922
Creator: Verduzio, Rodolfo
Item Type: Refine your search to only Report
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Method of Successive Approximations for the Solution of Certain Problems in Aerodynamics

Description: A method of successive approximations for the solution of problems in the fields of diffusion, boundary-layer flow, and heat-transfer is illustrated by solving problems in each of these fields. In most of the examples, the approximate solutions are compared with known accurate solutions and the agreement is shown to be good.
Date: April 1951
Creator: Shvets, M. E.
Item Type: Refine your search to only Report
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Mixing and Ignition in Supercharged Engines

Description: Memorandum presenting two principal methods of mixing for carburetor engines, one using a suction carburetor and the other using a pressure carburetor. An investigation of the spark plugs in the engines and how to design them so they can resist high levels of heat is also provided.
Date: April 1926
Item Type: Refine your search to only Report
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Model Experiments on the Forces and Moments Acting on an End Plate Fitted to a Wing

Description: "This paper reports on 4-component balance measurements with and without angle of sideslip made on an airfoil with end plate at one tip. In addition, pressure distribution measurements on the end plate served as a basis for the determination of the forces on the end plate and for the bending moments" (p. 1).
Date: April 1938
Creator: Schrenk, O.
Item Type: Refine your search to only Report
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Motion of Spheres in Still Fluids

Description: "The behavior of a liquid or gaseous medium, in which a solid body can move freely under the action of a force of constant magnitude and direction, is yet little known. Only in connection with a few special problems, which belong in this field, have experiments been tried and these chiefly concern technically important cases. The behavior of the simplest shaped bodies has as yet been scarcely investigated at all" (p. 1).
Date: April 1924
Creator: Hirsch, P.
Item Type: Refine your search to only Report
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The Mutual Action of Airplane Body and Power Plant

Description: The present report concerns the development of general propeller performance and r.p.m. curves which, combined with the general curve of the power required for level flight, presents a complete picture of the performance. The curve of power required for level flight in this paper is only an approximation for constant profile drag coefficient, meaning that it is not suitable to unconventional wing sections.
Date: April 1932
Creator: Schrenk, Martin
Item Type: Refine your search to only Report
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My Experience With Helicopters

Description: The author recounts his experiments with helicopters. The object of his investigations was to remain stationary in the air for five minutes and to make a closed flight at low altitude. Some of the topics discussed include stabilization, horizontal flight, and directional control.
Date: April 1923
Creator: Oemichen, Etienne
Item Type: Refine your search to only Report
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A New Apparatus for Measuring the Temperature at Machine Parts Rotating at High Speeds

Description: "After a brief survey of the available methods for measuring the temperatures of machine parts at high speed, in particular turbine blades and rotors, an apparatus is described which is constructed on the principle of induction. Transmission of the measuring current by sliding contacts therefore is avoided. Up-to-date experiments show that it is possible to give the apparatus a high degree of sensitivity and accuracy" (p. 1).
Date: April 1945
Creator: Gnam, E.
Item Type: Refine your search to only Report
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The New Interpretation of the Laws of Air Resistance

Description: A closer examination of Newton's formula for air resistance shows that it is well to consider the air as an ordinary fluid, and, indeed for most of the velocities considered, as a non-compressible fluid, so long as the dimensions of the moving body are large in comparison with the mean free path of the particles of air.
Date: April 1923
Creator: Prandtl, L.
Item Type: Refine your search to only Report
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A new spinning-test method

Description: This report contains a description of a new spinning-test arrangement wherein the otherwise customary rotation of the model about a fixed axis is abandoned in favor of a corresponding rotation of the air stream. The advantage of this method lies in the fact that the model is at rest while the spin is recorded. In this manner it is possible to secure systematic results with little loss of time while employing 3- or 6-component wind-tunnel balances. The troublesome equalization of the mass forces… more
Date: April 1938
Creator: Kramer, M. & Krüger, K. B.
Item Type: Refine your search to only Report
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On Ionization and Luminescence in Flames

Description: An explanation based upon reaction kinetics is presented to account for the deviation of measured ionization levels obtained from reflection experiments from the values computed assuming chemical equilibrium. The heat transfer to the unburned fuel is also considered.
Date: April 1951
Creator: Sänger, E.; Goercke, P. & Bredt, I.
Item Type: Refine your search to only Report
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On the Definition of the Standard Atmosphere

Description: "On April 15, 1920, the under Secretary of State for Aeronautics and Aerial Transport decided to adopt as Standard Atmosphere for official airplane tests in France, the atmosphere defined by the following law, known as the Law of the S.T.You.(Technical Section of Aeronautics): From 0 to 11,000 m. - 0=15-0.0065 Z and above 11,000 m. - 0= -56.5 degrees being the temperature in centigrade degrees at altitude Z expressed in meters. For altitude 0 the pressure is 760 mm of mercury. In the magazine "… more
Date: April 1921
Creator: Grimault, P.
Item Type: Refine your search to only Report
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