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1,599 Matching Results
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Theoretical Investigation of the Effect of the Ailerons on the Wing of an Airplane
The present work investigates, on the basis of Prandtl's wing theory, the form of the lift distribution when the ailerons are deflected in opposite directions. An ideal fluid and a wing with a rectangular form are assumed. The moments must not cause any rotation of the wing or any deviation from the rectilinear motion.
Date:
April 1929
Creator:
Wieselsberger, C.
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 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
Working Charts for the Selection of Aluminum Alloy Propellers of a Standard Form to Operate With Various Aircraft Engines and Bodies
"Working charts are given for the convenient selection of aluminum alloy propellers of a standard form, to operate in connection with six different engine-fuselage combinations. The charts have been prepared from full-scale test data obtained in the 20-foot propeller research tunnel of the National Advisory Committee for Aeronautics. An example is also given showing the use of the charts" (p. 3).
Date:
March 25, 1929
Creator:
Weick, Fred E.
System:
The UNT Digital Library
The Effect of Reduction Gearing on Propeller-Body Interference as Shown by Full-Scale Wind-Tunnel Tests
This report presents the results of full-scale tests made on a 10-foot 5-inch propeller on a geared J-5 engine and also on a similar 8-foot 11-inch propeller on a direct-drive J-5 engine. Each propeller was tested at two different pitch settings, and with a large and a small fuselage. The investigation was made in such a manner that the propeller-body interference factors were isolated, and it was found that, considering this interference only, the geared propellers had an appreciable advantage in propulsive efficiency, partially due to the larger diameter of the propellers with respect to the bodies, and partially because the geared propellers were located farther ahead of the engines and bodies.
Date:
March 20, 1929
Creator:
Weick, Fred E.
System:
The UNT Digital Library
Full-Scale Wind-Tunnel Tests on Several Metal Propellers Having Different Blade Forms
"This report gives the full-scale aerodynamic characteristics of five different aluminum alloy propellers having four different blade forms. They were tested on an open cockpit fuselage with a radial air-cooled engine having conventional cowling. The results show that (1) the differences in propulsive efficiency due to the differences in blade form were small; (2) the form with the thinnest airfoil sections had the highest efficiency; (3) it is advantageous as regards propulsive efficiency for a propeller operating in front of a body, such as a radial engine, to have its pitch reduced toward the hub" (p. 123).
Date:
March 18, 1929
Creator:
Weick, Fred E.
System:
The UNT Digital Library
The Effect of Supercharger Capacity on Engine and Airplane Performance
This report presents the results of an investigation to determine the effect of different supercharger capacities on the performance of an airplane and its engine . The tests were conducted on a DH4-M2 airplane powered with a Liberty 12 engine. In this investigation four supercharger capacities, obtained by driving a roots type supercharger at 1.615, 1.957, 2.4, and 3 time engine speed, were used to maintain sea-level pressure at the carburetor to altitudes of 7,000, 11,500, 17,000, and 22,000 feet, respectively. The performance of the airplane in climb and in level flight was determined for each of the four supercharger drive ratios and for the unsupercharged condition.
Date:
March 13, 1929
Creator:
Schey, O. W. & Gove, W. D.
System:
The UNT Digital Library
Full-Scale Wind-Tunnel Tests With a Series of Propellers of Different Diameters on a Single Fuselage
"Aerodynamic tests were made with four geometrically similar metal propellers of different diameters, on a Wright "Whirlwind" J-5 engine in an open cockpit fuselage. The results show little difference in the characteristics of the various propellers, the only one of any importance being an increase of efficiency of the order of 1 per cent for a 5 per cent increase of diameter, within the range of the tests" (p. 107).
Date:
March 12, 1929
Creator:
Weick, Fred E.
System:
The UNT Digital Library
Analysis of flight and wind-tunnel tests on Udet airplanes with reference to spinning characteristics
This report presents an analysis of results of wind-tunnel tests conducted at the D.V.L. Values were determined for the effectiveness of all the controls at various angles of attack. The autorotation was studied by subjecting the rotating model to an air blast.
Date:
March 1929
Creator:
Herrmann, H.
System:
The UNT Digital Library
The De Havilland D.H. 75 "Hawk Moth" (British): Cabin Monoplane
The Hawk Moth is designed as a passenger aircraft with comfort in mind. It seats 4. The tail is of metal construction, while the wings are of wood. It has a total loaded weight of 3500 lbs.
Date:
March 1929
Creator:
unknown
System:
The UNT Digital Library
Effect of Stressed Covering on Strength of Internal Girders of a Wing
In practice the actual maximum stress is greater than the stress determined by the simple girder theory, which overestimates the bearing or supporting capacity of the flange. The fact is that the assumptions of the simple girder theory no longer hold true, since normal transverse and shearing stresses are engendered in the plane of the flange.
Date:
March 1929
Creator:
Tellers, H.
System:
The UNT Digital Library
Impact Waves and Detonation: Part 1
"Among the numerous thermodynamic and kinetic problems that have arisen in the application of the gaseous explosive reaction as a source of power in the internal combustion engine, the problem of the mode or way by which the transformation proceeds and the rate at which the heat energy is delivered to the working fluid became very early in the engine's development a problem of prime importance. The work of Becker here given is a notable extension of earlier investigations, because it covers the entire range of the explosive reaction in gases - normal detonation and burning" (p. i).
Date:
March 1929
Creator:
Becker, R.
System:
The UNT Digital Library
Impact Waves and Detonation: Part 2
A continuation of a previous technical memorandum regarding impact waves and detonation. This particular report focuses on the applications to detonation under several different conditions, including variations in pressure.
Date:
March 1929
Creator:
Becker, R.
System:
The UNT Digital Library
Mechanical Control of Airplanes
"Before undertaking a detailed description of an automatic-control mechanism, I will state briefly the fundamental conditions for such devices. These are: 1) it must be sensitive at one or more reference values; 2) it must stop the angular motions of the airplane not produced by the pilot; and 3) it must be possible to switch it off and on by a simple hand lever" (p. 1).
Date:
March 1929
Creator:
Boykow, H.
System:
The UNT Digital Library
Morane-Saulnier 180 Light Airplane (French): A Single-Seat Training Monoplane
Circular describing the Morane-Saulnier 180 light airplane, which is a single-seat training monoplane. A description of the components, design, characteristics, theoretical performance, drawings, and photographs are provided.
Date:
March 1929
Creator:
unknown
System:
The UNT Digital Library
Nieuport-Delage 640 (French): Commercial High-Wing Monoplane
The Nieuport Delage 640 is a single engine commercial high-wing monoplane of all wood construction, including the fuselage and tail. It's landing gear is hinged in two parts.
Date:
March 1929
Creator:
unknown
System:
The UNT Digital Library
The Boulton and Paul "Partridge" (British): All-Metal Single-Seat Fighter
The Partridge is a tractor biplane of orthodox design. It has a single supercharged Jupiter VII engine.
Date:
February 1929
Creator:
unknown
System:
The UNT Digital Library
Corrosion Embrittlement of Duralumin. V: Results of Weather-Exposure Tests
In a series of weather exposure tests of sheet duralumin, upon which accelerated corrosion tests in the laboratory by the wet-and-dry corrosion method in a sodium chloride solution has already been carried out, a close parallelism between the results of the two kinds of tests was found to exist. The exposure tests showed that the lack of permanence of sheet duralumin is largely, if not entirely, due to corrosion. A corrosion attack of an intercrystalline nature is very largely responsible for the degree of embrittlement produced.
Date:
February 1929
Creator:
Rawdon, Henry S.
System:
The UNT Digital Library
Danger of Ice Formation on Airplanes
This paper relates the different types of ice formations that can occur on airplanes and the dangers that they pose.
Date:
February 1929
Creator:
Kopp, W.
System:
The UNT Digital Library
Effect of Intake Pipe on the Volumetric Efficiency of an Internal Combustion Engine
" The writer discusses the phenomena of expansion and compression which alternately take place in the cylinders of four-stroke engines during the induction process at a high mean piston speed due to the inertia and elasticity of the mixture in the intake pipe. The present paper is intended to demonstrate theoretically the existence of a most favorable pipe length for charging" (p. 1).
Date:
February 1929
Creator:
Capetti, Antonio
System:
The UNT Digital Library
A New Method for the Prediction of Airplane Performance
A new method for the prediction of airplane performance in level and climbing flight, together with complete information regarding propeller speeds, is described in this report. Developed from Bairstow's system and making use of American absolute coefficients, this method has advantages of simplicity and brevity.
Date:
February 1929
Creator:
Lesley, E. P. & Reid, E. G.
System:
The UNT Digital Library
Remarks on Airplane Struts and Girders Under Compressive and Bending Stresses: Index Values
In this paper the behavior of straight, centrally loaded compression struts is discussed and values computed.
Date:
February 1929
Creator:
Wagner, Herbert
System:
The UNT Digital Library
The measurement of fluctuations of air speed by the hot-wire anemometer
"The hot-wire anemometer suggests itself as a promising method for measuring the fluctuating air velocities found in turbulent flow. The only obstacle is the presence of a lag due to the limited energy input which makes even a fairly small wire incapable of following rapid fluctuations with accuracy. This paper gives the theory of the lag and describes an experimental arrangement for compensating for the lag for frequencies up to 100 or more per second when the amplitude of the fluctuation is not too great. An experimental test of the accuracy of compensation and some results obtained with the apparatus in a wind-tunnel air stream are described. While the apparatus is very bulky in its present form, it is believed possible to develop a more portable arrangement" (p. 359).
Date:
January 8, 1929
Creator:
Dryden, H. L. & Kuethe, A. M.
System:
The UNT Digital Library
Albessard "Triavion" Airplane (French): A Two-Seat Tandem Monoplane
Autostability is the watchword of this tandem monoplane. The tandem design causes a natural flat flight pattern and it can also land and take off from very short runways. Details of the form, wings, ailerons, fuselage, characteristics, performances, drawings, and photographs are provided.
Date:
January 1929
Creator:
Serryer, J.
System:
The UNT Digital Library