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Intercooler cooling-air weight flow and pressure drop for minimum drag loss
Report presenting an analysis of the power losses in airplane flight of cross-flow plate and tubular intercoolers to determine the cooling-air weight flow and pressure drop that give minimum total power loss for any given cooling effectiveness. The investigation covers a range of flight conditions of altitude, airspeed, lift-drag ratio, supercharger-pressure ratio, and adiabatic efficiency.
Date:
April 1944
Creator:
Reuter, J. George & Valerino, Michael F.
System:
The UNT Digital Library
Lioré-Olivier LeO 194 Seaplane
Report presenting a description of the Lioré-Olivier LeO 194 seaplane and a particular series of flights made over several months. Its fuselage is made entirely of wood. It has 6 gasoline tanks each with a capacity of 255 liters. It is a single engine biplane with wings mounted above the body of the seaplane.
Date:
April 1927
Creator:
unknown
System:
The UNT Digital Library
Review of Flight Tests of NACA C and D Cowlings on the XP-42 Airplane
Report presenting the results of flight tests of the performance and cooling characteristics of three NACA D cowlings and of a conventional NACA C cowling on the XP-42 airplane. The D cowling is, generally, characterized by the use of an annular inlet and diffuser section for the engine-cooling air. An increase in maximum speed was noted in the XP-42 airplane due to the change from a C cowling to a D cowling.
Date:
April 1943
Creator:
Johnston, J. Ford
System:
The UNT Digital Library
The Transformation of Heat in an Engine
This report presents a thermodynamic basis for rating heat engines. The production of work by a heat engine rests on the operation of supplying heat, under favorable conditions, to a working fluid and then taking it away.
Date:
April 1929
Creator:
Neumann, Kurt
System:
The UNT Digital Library
The C.A.M.S. 60 Seaplane (French): A Twin-Engine Bombing and Torpedo Monoplane
Circular presenting a description of the C.A.M.S. 60, which is a twin-engine monoplane with a medium-thickness wing and two floats. Details of the wings, engines, fuselages, floor, rear cabin, floats, and flying qualities are provided.
Date:
April 1931
Creator:
unknown
System:
The UNT Digital Library
The S.A.B.C.A. "S.XI" Commercial Airplane (Belgian): A High-Wing Semicantilever Monoplane
Circular describing the S.A.B.C.A. S.XI commercial airplane, which is a high-wing semicantilever monoplane. Details of the history of its creation, its design, components, engines, fuel tanks, characteristics, performances, drawings, and photographs are provided.
Date:
April 1932
Creator:
Frachet, André
System:
The UNT Digital Library
D.H. 86 "Express Air Liner" (British): A Four-Engine Biplane
Circular describing the De Havilland Express Air Liner, which is a four-engine two-bay biplane of clean and well-streamlined form. Details of the cabin, controls, fuselage, tail, wings, engines, cockpit, characteristics, performance, drawings, and photographs are provided.
Date:
April 1934
Creator:
unknown
System:
The UNT Digital Library
The S.P.C.A. 40 T Commercial Airplane (French): An All-Metal Cantilever Monoplane
Circular describing the S.P.C.A. 40 T, which is a commercial all-metal cantilever airplane that was guided by the two essential requirements of economy and safety in its design. Details of the design, power, test results, fuel tanks, characteristics, performances, drawings, and photographs are provided.
Date:
April 1931
Creator:
unknown
System:
The UNT Digital Library
The Farman "F.300" Commercial Airplane (French): A High-Wing Semicantilever Monoplane
Circular describing the Farman F.300 airplane, which is a high-wing semicantilever monoplane. Details of the wings, engine, equipment, safety, characteristics, performance, drawings, and photographs are provided.
Date:
April 1930
Creator:
unknown
System:
The UNT Digital Library
The Westland Iv Commercial Monoplane (British): Three "Cirrus III" Engine
Circular presenting a description of the Westland IV, which is a high-wing monoplane with strut bracing, two outboard engines, a fairly large fuselage that provides comfortable cabin accommodation, and wide-track landing gear. Details of the design, flight characteristics, blueprints, and photographs are provided.
Date:
April 1929
Creator:
unknown
System:
The UNT Digital Library
The Boulton and Paul P.64 Mail-Carrier: A Two-Engine All-Metal Biplane
Circular presenting a description of the Boulton and Paul P.64 high-performance mail-carrier. It is a two-engine tractor biplane that has been designed to give the specified normal speed with each engine throttled down to approximately half its output. Details of the landing gear, structural features, pilots' compartment, accommodation for mails, controls, power plant, and some flying qualities are provided.
Date:
April 1933
Creator:
unknown
System:
The UNT Digital Library
NACA Investigation of a Jet-Propulsion System Applicable to Flight
"Following a brief history of the NACA investigation of jet-propulsion, a discussion is given of the general investigation and analyses leading to the construction of the jet-propulsion ground-test mock-up. The results of burning experiments and of test measurements designed to allow quantitative flight-performance predictions of the system are presented and correlated with calculations. These calculations are then used to determine the performance of the system on the ground and in the air at various speeds and altitudes under various burning conditions. The application of the system to an experimental airplane is described and some performance predictions for this airplane are made" (p. 1).
Date:
April 1944
Creator:
Brown, Clinton E.
System:
The UNT Digital Library
The "Potez 39" Observation Airplane (French): An All-Metal High-Wing Two-Seat Monoplane
Circular describing the Potez 39, which is an all-metal high-wing two-seat observation monoplane. Details regarding the design, construction, components, characteristics, drawings, and photographs are provided.
Date:
April 1930
Creator:
unknown
System:
The UNT Digital Library
The Blackburn "Bluebird" Mark IV (British): All-Metal Biplane
Circular presenting a description of the Blackburn Bluebird Mark IV, which is an all-metal airplane. Details are provided regarding constructional features, the cockpit, the gasoline system, and the flight characteristics.
Date:
April 1929
Creator:
unknown
System:
The UNT Digital Library
Wind-Tunnel Procedure for Determination of Critical Stability and Control Characteristics of Airplanes
"This report outlines the flight conditions that are usually critical in determining the design of components of an airplane which affect its stability and control characteristics. The wind-tunnel tests necessary to determine the pertinent data for these conditions are indicated, and the methods of computation used to translate these data into characteristics which define the flying qualities of the airplane are illustrated" (p. 1).
Date:
April 1944
Creator:
Goett, Harry J.; Jackson, Roy P. & Belsley, Steven E.
System:
The UNT Digital Library
Nitrided-steel piston rings for engines of high specific power
Report presenting testing of several designs of nitrided-steel piston rings under variable conditions of output. Testing indicated the importance of good surface finish and conformity of the ring to the bore. Results regarding temperature tests, single-cylinder-engine tests, and multicylinder-engine tests are provided.
Date:
April 1944
Creator:
Collins, John H., Jr.; Bisson, Edmond E. & Schmiedlin, Ralph F.
System:
The UNT Digital Library
Some New Tests at the Gottingen Laboratory
The tests at the Gottingen laboratory included: friction tests on a surface treated with emaillite, verification tests on the M.V.A. 356 wing, and comparative tests of wing no. 36 at the Eiffel laboratory. The examination of all these experiments leads to the belief that, at large incidences, the speeds registered by the suction manometer of the testing chamber of the Eiffel laboratory wind tunnel are, owing to pressure drop, greater than the actual speeds. Therefore, the values of k(sub x) and k(sub y) measured at the Eiffel laboratory at large incidences are too low.
Date:
April 1921
Creator:
unknown
System:
The UNT Digital Library
Motion of Spheres in Still Fluids
"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.
System:
The UNT Digital Library
The Transference of Heat From a Hot Plate to an Air Stream
The object of the present study was to define experimentally the field of temperature and velocity in a heated flat plate when exposed to an air stream whose direction is parallel to it, then calculate therefrom the heat transference and the friction past the flat plate, and lastly, compare the test data with the mathematical theory. To ensure comparable results, we were to actually obtain or else approximate: a) two-dimensional flow; b) constant plate temperature in the direction of the stream. To approximate the flow in two dimensions, we chose a relatively wide plate and measured the velocity and temperature in the median plane.
Date:
April 1931
Creator:
Elias, Franz
System:
The UNT Digital Library
Contribution to the Systematic Investigation on Joukowsky Profiles
"This article resulted from the need of showing, in a simple way, how the aerodynamic properties of airfoils are affected by the shape of their profiles. No general solution of this problem could be found, since the profile shapes cannot ordinarily be expressed by simple mathematical formulas. This advantage is possessed only by the Joukowsky profiles and this discussion of the problem is therefore limited to them" (p. 1).
Date:
April 1928
Creator:
Loew, Gottfried
System:
The UNT Digital Library
Kinetographic Determination of Airplane Flight Characteristics
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.
System:
The UNT Digital Library
The Mutual Action of Airplane Body and Power Plant
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
System:
The UNT Digital Library
Performance of B. M. W. 185-horsepower airplane engine
Report discusses the results of testing on a B.M.W. engine in an altitude chamber where temperature and pressure can be controlled to simulate flight at various altitudes. Results for various engine speeds, altitudes, and propeller speeds are provided.
Date:
April 13, 1922
Creator:
Sparrow, Stanwood Willston
System:
The UNT Digital Library
Some Recent Contributions to the Study of Transition and Turbulent Boundary Layers
Report presenting a paper in two parts about transition and turbulent boundary layers. The first part reviews the current problem of the instability of laminar boundary layers. The second part reviews the current state of knowledge of the mechanics of turbulent boundary layers and of the methods now being used for fundamental studies of the turbulent fluctuations in turbulent boundary layers.
Date:
April 1947
Creator:
Dryden, Hugh L.
System:
The UNT Digital Library