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Analysis of Dr. Schaffran's Propeller Model Tests

Description: Note presenting an analysis of the propeller model tests of Dr. Schaffran. Only the thrust is examined. The results indicate that the thrust produced by three-blade and four-blade propellers follows the same laws as with two-blade propellers, and that all conclusions reached from Dr. Durand's tests can be upheld.
Date: September 1923
Creator: Munk, Max M.
Partner: UNT Libraries Government Documents Department

Air Resistance Measurements on Actual Airplane Parts

Description: "For the calculation of the parasite resistance of an airplane, a knowledge of the resistance of the individual structural and accessory parts is necessary. The most reliable basis for this is given by tests with actual airplane parts at airspeeds which occur in practice. The data given here relate to the landing gear of a Siemanms-Schuckert DI airplane; the landing gear of a 'Luftfahrzeug-Gesellschaft' airplane (type Roland Dlla); landing gear of a 'Flugzeugbau Friedrichshafen' G airplane; a machine gun, and the exhaust manifold of a 269 HP engine" (p. 1).
Date: November 1923
Creator: Weiselsberger, C.
Partner: UNT Libraries Government Documents Department

Experiments With Fabrics for Covering Airplane Wings

Description: Note presenting a study of the strength and deformation of the fabric used to cover airplane wings, both undoped and doped. The doping of the fabric with Cellon seems to have a predominant influence on the results according to the nature and number of the coats.
Date: April 1923
Creator: Pröll, A.
Partner: UNT Libraries Government Documents Department

An Optical Altitude Indicator for Night Landing

Description: One of the most ingenious of the devices intended for use in night landing, especially emergency landing, is a very simple optical instrument known as the Jenkins night altitude indicator. The design and operation of this instrument, which allows a pilot to determine the altitude of the aircraft, is discussed. The author discusses various modifications and improvements that might be made to the instrument.
Date: January 1923
Creator: Warner, John A. C.
Partner: UNT Libraries Government Documents Department

Flight Characteristics

Description: Note presenting some comparative performances of new types of airplanes under the same conditions. The airplanes were compared with some that are already in use and give an accurate idea of the progress shown in the new types.
Date: August 1923
Creator: Student
Partner: UNT Libraries Government Documents Department

Influences in the Selection of a Cycle for Small High Speed Engines Running on Solid or Airless Injection With Compression Ignition

Description: Note presenting an investigation undertaken to answer the question of what cycle of heat phases should be selected for small high speed engines running on solid or airless injection with compression ignition, and what the relative proportions of the heat phases should be.
Date: July 1923
Creator: Matthews, Robertson
Partner: UNT Libraries Government Documents Department

The Time Lag and Interval of Discharge With a Spring Actuated Fuel Injection Pump

Description: Discussed here is research on a spring activated fuel pump for solid or airless injection with small, high speed internal combustion engines. The pump characteristics under investigation were the interval of fuel injection in terms of degrees of crank travel and in absolute time, the lag between the time the injection pump plunger begins its stroke and the appearance of the jet at the orifice, and the manner in which the fuel spray builds up to a maximum when the fuel valve is opened, and then diminishes.
Date: September 1923
Creator: Matthews, Robertson & Gardiner, A. W.
Partner: UNT Libraries Government Documents Department

Downwash of Airplane Winds

Description: "The data for the calculation of the air forces acting on the elevators, obtained from previous model experiments are not immediately applicable in practice, as the angle at which the control surfaces meet the air stream is, in general, still unknown. The air stream, when it reaches the elevator has already been deflected by the wings and although the velocity imparted to the air current by the wings is of negligible amount compared with the speed of flight, the air behind the wings has been deflected downwards, so that the elevators work in an airstream which is inclined in a downward direction. The angle at which the air stream meets the elevator surface is, therefore, different from, and, with the usual arrangement of elevators, less than the angle made by the elevator surfaces with the line of flight" (p. 1).
Date: January 1923
Creator: Munk, Max & Cario, Gunther
Partner: UNT Libraries Government Documents Department

Experiments With a Built-In or Fuselage Radiator

Description: "The experiments discussed here were performed to determine whether radiators having similar cooling properties offer less resistance when incorporated into the fuselage, than when the hitherto customary arrangement is employed, with the radiator in the free air current more or less independent of the fuselage. The experiments indicated that the quantity of air flowing through the radiator is greatest when the fuselage and the radiator are separate. However, separate radiators cause more air resistance" (p. 1).
Date: May 1923
Creator: Wieselsberger, C.
Partner: UNT Libraries Government Documents Department

Disturbing Effect of Free Hydrogen on Fuel Combustion in Internal Combustion Engines

Description: "Experiments with fuel mixtures of varying composition, have recently been conducted by the Motor Vehicle and Airplane Engine Testing Laboratories of the Royal Technical High School in Berlin and at Fort Hahneberg, as well as at numerous private engine works. The behavior of hydrogen during combustion in engines and its harmful effect under certain conditions, on the combustion in the engine cylinder are of general interest. Some of the results of these experiments are given here, in order to elucidate the main facts and explain much that is already a matter of experience with chauffeurs and pilots" (p. 1).
Date: March 1923
Creator: Riedler, A.
Partner: UNT Libraries Government Documents Department

Fittings and Other Structural Parts of Airplanes

Description: "The strength and reliability of airplanes depend greatly on the careful design and manufacture of fittings, couplings, and other highly stressed parts. The more important parts of the airplane must be occasionally tested for increased loads and in order to avoid the possibility of defects creeping in during subsequent production. Strength tests are discussed for fittings for wing spar joints, fittings for strut connections, internal bracing, control gear, and landing gear" (p. 1).
Date: October 1923
Creator: Eydam, P.
Partner: UNT Libraries Government Documents Department

Model Supports and Their Effects on the Results of Wind Tunnel Tests

Description: "The airflow about a model while being tested is often sufficiently affected by the model support to lead to erroneous conclusions unless appropriate corrections are used. In this paper some new material on the subject is presented, together with a review of the airfoil support corrections used in several other laboratories" (p. 1).
Date: February 1923
Creator: Bacon, David L.
Partner: UNT Libraries Government Documents Department

Determination of the Value of Wood for Structural Purposes

Description: Note presenting an investigation of the value of wood for structural parts subject to stress. An exploration of several different types of wood is provided, including the coefficeint of elongation in bending, tensile strength, compression strength, and energy required for fracture is provided.
Date: April 1923
Creator: Baumann, Richard
Partner: UNT Libraries Government Documents Department

Aeronautical Instruments

Description: Note presenting a number of instruments that can assist pilots with observing the position of the airplane. Some of the instruments include an inclinometer with stationary system of reference and an inclinometer with moving axes.
Date: June 1923
Creator: Bennewitz, Kurt
Partner: UNT Libraries Government Documents Department

Influence of Ribs on Strength of Spars

Description: Note presenting an investigation to determine what effect joints connected with brackets, nails, and glue has on the strength of aircraft wing spars. Equations used to determine the results of loading tests are provided.
Date: May 1923
Creator: Ballenstedt, L.
Partner: UNT Libraries Government Documents Department

An impulse electric motor for driving recording instruments

Description: The chief purpose in undertaking the development of this synchronous motor was the creation of a very small, compact power source, capable of driving the film drums of the recording aircraft instruments designed by the staff of the National Advisory Committee for Aeronautics.
Date: September 1923
Creator: Joachim, W. F.
Partner: UNT Libraries Government Documents Department

Notes on the design of ailerons

Description: "Recent data have shown that certain forms or types of ailerons that are in extensive use are in reality quite inefficient and entirely unsuited for the high speeds now realized. The same data indicate that two forms (both shown here) are efficient and satisfactory in every way. The most important characteristics of ailerons are effectiveness under all flight conditions, small moments about the hinge, high efficiency (small yawing moment opposing turn), and simplicity in construction. Information required for the design of ailerons is given for chord, span, area, and plan form" (p. 1).
Date: June 1923
Creator: Diehl, W. S.
Partner: UNT Libraries Government Documents Department