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Technical Report Archive and Image Library
212
National Advisory Committee for Aeronautics Collection
158
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41
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20
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17
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5
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30
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23
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11
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306 Matching Results
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Wind-Tunnel Research Comparing Lateral Control Devices, Particularly at High Angles of Attack 1: Ordinary Ailerons on Rectangular Wings
"This report is the first in a series in which it is intended to compare the relative merits of all ordinary and some special forms of ailerons and other lateral control devices in regard to their effect on lateral controllability, lateral stability, and airplane performance. The comparisons are based on wind-tunnel test data, all the control devices being fitted to model wings having the same span, area, and airfoil section, and being subjected to the same series of force and rotation tests. The results are given for five different aileron movements: one with equal up-and-down deflection, one with average and one with extreme differential motion, one with upward deflection only, and one with the ailerons arranged to float with respect to the wing" (p. 357).
Date:
December 10, 1931
Creator:
Weick, Fred E. & Wenzinger, Carl J.
Object Type:
Report
System:
The UNT Digital Library
Coal-Mine Fatalities in November, 1930
Report issued by the U.S. Bureau of Mines on the fatalities of coal miners in November, 1930. The common causes of death, and the location of the mines that the fatalities occurred in are listed. This report includes tables.
Date:
December 1931
Creator:
Adams, William Waugh & Chenoweth, L.
Object Type:
Report
System:
The UNT Digital Library
Development of a Non-Autorotative Airplane Capable of Steep Landing
In the following we develop a non-autorotating monoplane wing. The conditions imposed on such a wing, aside from its freedom from autorotation,with respect to its polars and its construction, are taken into account as far as possible. It is indicated that the autorotation characteristics of a wing are dependent upon the speed of air flow as well as on the angle of yaw. This report postulates the knowledge of the behavior of certain conventional wings of different chords and cambers with respect to their air loads at large angles of attack.
Date:
December 1931
Creator:
Schmidt, Wilhelm
Object Type:
Report
System:
The UNT Digital Library
The effectiveness of a double-stem injection valve in controlling combustion in a compression-ignition engine
An investigation was made to determine to what extent the rates of combustion in a compression-ignition engine can be controlled by varying the rates of fuel injection. The tests showed that the double-stem valve operated satisfactorily under all normal injection conditions; the rate of injection has a definite effect on the rate of combustion; the engine performance with the double-stem valve was inferior to that obtained with a single-stem valve; and the control of injection rates permitted by an injection valve of two stages of discharge is not sufficient to effect the desired rates of combustion.
Date:
December 1931
Creator:
Spanogle, J. A. & Whitney, E. G.
Object Type:
Report
System:
The UNT Digital Library
Factors Influencing Flow of Natural Gas Through High-Pressure Transmission Lines
Report issued by the U.S. Bureau of Mines on the effects of different operating conditions on high-pressure natural gas pipelines. Analysis of past and current studies on natural gas transmission are presented. This report includes tables, graphs, and an illustration.
Date:
December 1931
Creator:
Berwald, W. B. & Johnson, T. W.
Object Type:
Report
System:
The UNT Digital Library
Goldstein's Solution of the Problem of the Aircraft Propeller With a Finite Number of Blades
This report examines the Betz theory on frictionless, lightly loaded propellers and Prandtl's addendum extended to moderately loaded propellers. The author then goes on to extend the discussion to Goldstein's solution for propellers with a finite number of blades.
Date:
December 1931
Creator:
Helmbold, H. B.
Object Type:
Report
System:
The UNT Digital Library
The interference effects on an airfoil of a flat plate at mid-span position
"This report gives the results of an investigation of the mutual interference of an airfoil and a flat plate inserted at mid-span position. The tests were conducted in the Variable-Density Wind Tunnel of the National Advisory Committee for Aeronautics at a high value of the Reynolds Number. The interference effects of this combination were found to be small. Supplementary tests indicated that the use of fillets decreases both the lift and drag slightly. A bibliography of publication dealing with interference between wings and bodies, and with the effects of cut-outs and fillets is included" (p. 1).
Date:
December 1931
Creator:
Ward, Kenneth E.
Object Type:
Report
System:
The UNT Digital Library
Liquid Cooling of Aircraft Engines
This report presents a method for solving the problem of liquid cooling at high temperatures, which is an intermediate method between water and air cooling, by experiments on a test-stand and on an airplane. A utilizable cooling medium was found in ethylene glycol, which has only one disadvantage, namely, that of combustibility. The danger, however is very slight. It has one decided advantage, that it simultaneously serves as protection against freezing.
Date:
December 1931
Creator:
Weidinger, Hanns
Object Type:
Report
System:
The UNT Digital Library
Mammals of New Mexico
Summary of the species of mammals native to New Mexico, including a map of the life zones, descriptions of the physiographic features, and lists of characteristic zone-marking plants, birds, mammals.
Date:
December 1931
Creator:
Bailey, Vernon
Object Type:
Report
System:
The UNT Digital Library
Method of Determining the Weights of the Most Important Simple Girders
"This paper presents a series of tables for the simple and more common types of girders, similar to the tables given in handbooks under the heading "Strength of Materials," for determining the moments, deflections, etc., of simple beams. Instead of the uniform cross section there assumed, the formulas given here apply only to girders of "uniform strength," i.e., it is assumed that a girder is so dimensioned that a given load subjects it to a uniform stress throughout its whole length. This principle is particularly applicable to very strong structures" (p. 1).
Date:
December 1931
Creator:
Cassens, J.
Object Type:
Report
System:
The UNT Digital Library
The Supermarine S.6.B. Racing Seaplane (British): A Low-Wing Twin-Float Monoplane
Circular presenting a description of the Supermarine S.6.B. racing seaplane, which was the winner of a seaplane contest. Information regarding the oil system, water system, fuel system, floats, and controls are provided.
Date:
December 1931
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Tests of N.A.C.A. airfoils in the variable density wind tunnel Series 44 and 64
This note is one of a series covering an investigation of a number of related airfoils. It presents the results obtained from tests in the N.A.C.A. Variable Density Wind Tunnel of two groups of six airfoils each. One group, the 44 series, has a maximum mean camber of 4 percent of the chord at a position 0.4 of the chord behind the leading edge and the other group, the 64 series, has a maximum mean camber of 6 percent of the chord at the same position. The members within each group differ only in maximum thickness, the maximum thickness/chord ratios being: 0.06, 0.09, 0.12, 0.15, 0.18, and 0.21. The results are analyzed with a view to indicating the variation of the aerodynamic characteristics with profile thickness for airfoils having a certain mean camber line form.
Date:
December 1931
Creator:
Jacobs, Eastman N. & Pinkerton, Robert M.
Object Type:
Report
System:
The UNT Digital Library
Wind Tunnel of the Bucharest Polytechnic Institute
This report describes the Bucharest wind tunnel and presents numerous photographs and diagrams. The wind tunnel is of the closed- circuit type, the return being symmetrical with respect t o the longitudinal axis of the tunnel. Th e tunnel is of the horizontal type with a diameter of 3. 2 m (10. 5-ft.) a t the beginning of the entrance cone, and 1.5 m ( 4,92 ft.) at the entrance to the test chamber. The latter, 2 m (6.56 ft.) long, may be either of the open-jet type or enclosed in a cylindrical housing.
Date:
December 1931
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The effect on airplane performance of the factors that must be considered in applying low-drag cowling to radial engines
From Summary: "This report presents the results of flight tests with three different airplanes using several types of low-drag cowling for radial air-cooled engines. The greater part of the tests were made with a Curtiss XF7Cc-1 (Sea Hawk) with a 410 horsepower. Wasp engine, using three fuselage nose shapes and six types of outer cowling. The six cowlings were: a narrow ring, a wide ring, a wide cowling similar in the original NACA cowling, a thick ring incorporating an exhaust collector, a single-surface cowling shaped like the outer surface of the exhaust-collector cowling, and polygon-ring cowling, of which the angle of the straight sections with the thrust line could be varied over a wide range."
Date:
November 25, 1931
Creator:
McAvoy, William H.; Schey, Oscar W. & Young, Alfred W.
Object Type:
Report
System:
The UNT Digital Library
Tests of nacelle-propeller combinations in various positions with reference to wings. Part I : thick wing-N.A.C.A. cowled nacelle-tractor propeller
This report gives the results in the 20-foot propeller research tunnel of the National Advisory Committee for Aeronautics on the interference drag and propulsive efficiency of a nacelle-propeller combination located in 21 positions with reference to a thick wing. The lift, drag, and propulsive efficiency were obtained at several angles of attack for each of the 21 locations. A net efficiency was derived for determining the over-all effectiveness of each nacelle location. Best results were obtained with the propeller about 25 per cent of the chord directly ahead of the leading edge. A location immediately above or below the wing near the leading edge was very poor.
Date:
November 18, 1931
Creator:
Wood, Donald H.
Object Type:
Report
System:
The UNT Digital Library
Zinc and its alloys
A report on zinc and its alloys.
Date:
November 6, 1931
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Zinc and Its Alloys
Report issued by the Bureau of Standards discussing world production of zinc and zinc alloys. History, metallurgy, and structural properties of zinc are presented. This report includes tables, illustrations, and photographs.
Date:
November 6, 1931
Creator:
United States. Bureau of Standards.
Object Type:
Report
System:
The UNT Digital Library
Accident Experience and Cost of Accidents in Washington Coal Mines
Report containing tables detailing cost of mining accidents in Washington state in comparison with other states.
Date:
November 1931
Creator:
Ash, S. H.
Object Type:
Report
System:
The UNT Digital Library
Advantages of Oxide Films as Bases for Aluminum Pigmented Surface Coatings for Aluminum Alloys
Report discussing both laboratory and weather-exposure corrosion tests showed conclusively that the protection afforded by aluminum pigmented spar varnish coatings applied to previously anodized aluminum surfaces was greatly superior to that afforded by the same coatings applied to surfaces which had simply been cleaned free from grease and not anodized.
Date:
November 1931
Creator:
Buzzard, R. W. & Mutchler, W. H.
Object Type:
Report
System:
The UNT Digital Library
The aerodynamic characteristics of six commonly used Airfoils over a large range of positive and negative angles of attack
From Summary: "This paper presents the results of tests of six commonly used airfoils: the CYH, the N-22, the C-72, the Boeing 106, and the Gottingen 398. The lifts, drags, and pitching moments of the airfoils were measured through a large range of positive and negative angles of attack. The tests were made in the variable density wind tunnel of the National Advisory Committee for Aeronautics at a large Boeing 106, and the Gottingen 398 airfoils, the negative maximum lift coefficients were found to be approximately half the positive; but for the M-6 and the CYH, which have less effective values were, respectively, 0.8 and 0.6 of the positive values."
Date:
November 1931
Creator:
Anderson, Raymond F.
Object Type:
Report
System:
The UNT Digital Library
The effect of slots and flaps on the lift and drag of the McDonnell Airplanes determined in flight
This note contains the results of flight test conducted by the National Advisory Committee for Aeronautics on a low-wing monoplane equipped with leading-edge slots extending over the entire wing and flaps extending only to the ailerons, to find their effect on the lift and drag characteristics of the airplane. Curves are given showing the lift and drag characteristics of the airplane for the following conditions of the slots and flaps neutral; slots closed and flaps down; and slots open and flaps down. In addition, the high and low speed in level flight and the climbing characteristics are given. The results show that the slots used alone increase the maximum lift coefficient 54 per cent; the flaps alone increase it 38 per cent; and the slots and flaps in combination decrease the landing speed from 60 to 43 m.p.h.; increase the speed range of the airplane 40 per cent; and increase the glide angle at landing speed 4.2 degrees.
Date:
November 1931
Creator:
Soulé, Hartley A.
Object Type:
Report
System:
The UNT Digital Library
The Guilleman J.G. 10 (French) : A Two-Place Touring Low-Wing Monoplane
Circular describing the Guillemin J.G. 10, which is a two-place touring low-wing monoplane. Details of the wing, fuselage, engine, characteristics, drawings, and photographs are provided.
Date:
November 1931
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Measurement of Visibility From the Pilot's Cockpit on Different Airplane Types
A process for the measurement of the visibility of airplanes from the pilot's cockpit is developed. The apparatus necessary for the measurements was suitably constructed and measurements of the fields of vision were made with it. The visibilities of six airplanes of different types of construction and use were measured, as well as the visibility of an automobile for comparison. An attempt was made to establish minimum visibility requirements and to express the excellence of visibility by means of a numerical coefficient.
Date:
November 1931
Creator:
Kurz, Gerhard
Object Type:
Report
System:
The UNT Digital Library
Measurements of Vertical Air Currents in the Atmosphere
To summarize, the experiments with balloons, sailplanes and light airplanes conducted thus far, reveal the vertical velocities of the air to be primarily dependent on the vertical temperature distribution. Stable stratifications result in up-and-down currents forced by the contour of the ground, which are readily recognized in flight and, if need be, may be avoided.
Date:
November 1931
Creator:
Lange, K. O.
Object Type:
Report
System:
The UNT Digital Library