Technical Report Archive & Image Library (TRAIL) - 51 Matching Results

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Drag Measurements on a Junkers Wing Section: Application of the Betz Method to the Results of Comparative Tests Made on a Model and on an Airplane in Flight

Description: The comparison of model tests in flight can be based on the result of such measurements. They are very important from the aerodynamical point of view, as they lead to useful conclusions regarding the behavior of the wing, its best shape and the conformity of theoretical and actual flow. Although there still remains a certain prejudice against such measurements, I have still attempted to make these comparative tests in order to inspire confidence in their reliability.
Date: September 1927
Creator: Weidinger, Hanns
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Kinetographic Determination of Airplane Flight Characteristics

Description: The author's first experiments with a glider on flight characteristics demonstrated that an accurate flight-path measurement would enable determination of the polar diagram from a gliding flight. Since then he has endeavored to obtain accurate flight measurements by means of kinetograph (motion-picture camera). Different methods of accomplishing this are presented.
Date: April 1927
Creator: Raethjen, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Some German Gliders of 1920-1923

Description: Memorandum presenting a review of some of the German gliders produced from 1920-1923. The designs, flight characteristics, and descriptions of successful flights are provided.
Date: October 1927
Creator: Gymnich, Alfried
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Building a Full-Size Glider

Description: The building and flying of a glider is possible for anyone who can use a few basic tools. This report presents some plans and techniques for building your own glider.
Date: September 1927
Creator: Camm, F. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Researches on ailerons and especially on the test loads to which they should be subjected

Description: Aileron calculations have hitherto given greatly differing results according to different authors. It seems to be the general opinion that it is only necessary to give the ailerons such dimensions that the airplane can maneuver well, that the stresses they must undergo are relatively small, and that they are strong enough if their framework is of the order of strength as the wings to which they are attached. This article will show that the problem is really quite complex and that it should rece… more
Date: February 1927
Creator: Sabatier, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Determining the Velocity Distribution in the Boundary Layer of an Airfoil Fitted With a Rotary Cylinder

Description: In the closer investigation of the results obtained from a wing model with a rotary cylinder mounted in its leading edge (NACA TM's 307 and 354), the velocity distribution in the vicinity of the surface of the model was determined by a hot-wire anemometer. The results confirmed the belief that the rotary cylinder had considerable effect on the air flow, but demonstrated the fact that the direct influence of the cylinder is confined to a very thin layer in immediate proximity to the surface.
Date: May 1927
Creator: Van der Hegge Zijnen, B. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Approximation method for determining the static stability of a monoplane glider

Description: The calculations in this paper afford an approximate solution of the static stability. A derivation of the formulas for moment coefficient of a wing, moment coefficient of elevator, and the total moment of the combined wing and elevator and the moment coefficient with reference to the center of gravity are provided.
Date: November 1927
Creator: Lippisch, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Turbulent Flow

Description: Report presenting some information and potential areas of study of turbulent flow and turbulence.
Date: October 1927
Creator: Prandtl, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Testing a Windmill Airplane ("Autogiro")

Description: In order to clear up the matter ( In the Spanish report it was stated that the reference surface for the calculation of the coefficients c(sub a) and c(sub w) was the area of all four wings, instead of a single wing), the model of a windwill airplane was tested in the Gottingen wind tunnel.
Date: January 1927
Creator: Seiferth, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Stall-Proof Airplanes

Description: Report investigating some characteristics of aircraft stall, including the following: Is the danger of stalling necessarily inherent in the airplane in its present form and structure, or can it be diminished or eliminated by suitable means? Do we possess such means or devices and how must they operate?
Date: January 1927
Creator: Lachmann, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Heat Treatment of Duralumin

Description: When certain light aluminum alloys are heat-treated, quenched and aged, there is considerable improvement in their tensile properties. This paper presents different methods of accomplishing these heat treatments.
Date: March 1927
Creator: Nelson, Wm.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Systematic Investigation of Joukowsky Wing Sections

Description: Ackeret began systematic polar measurements on Joukowsky wing sections, which were occasionally conducted in the wind tunnel. Under these conditions a considerable number of wing sections were tested during the last four years and the tests are now more or less concluded.
Date: July 1927
Creator: Schrenk, O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High-Speed Oil Engines for Vehicles Part 2

Description: "Further progress toward the satisfactory solution of the difficult problem of the distribution and atomization of the injected fuel was made by extensive experimentation with various fuel valves, nozzles, and atomizing devices. Valuable information was also obtained through numerous experimental researches on the combustion of oils and the manner of introducing the combustion air into the cylinder, as well as on the physical processes of atomization, the determination of the size of drops, etc… more
Date: March 1927
Creator: Hausfelder, Ludwig
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Duralumin Welding

Description: Gas and electric welding of duralumin are discussed. Some of the elements that go into determining a successful weld and inspecting for faults are also described.
Date: February 1927
Creator: Nelson, Wm.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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On the Mutual Reaction of Wings and Body

Description: "At the suggestion of Professor Von Karman, I have made a few theoretical investigations of the mutual reaction of the wings and body of an airplane. There was assumed as the basis of my calculations, a strongly idealized body shape, namely, a cylinder extended to infinity at both ends and having its axis parallel to the direction of motion of the airplane. The results are to be regarded as rough approximations for a long airplane body and also for an airship with fins. In my calculations, I ha… more
Date: February 1927
Creator: Lennertz, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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