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Tests of N.A.C.A. airfoils in the variable density wind tunnel Series 44 and 64

Description: 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 i… more
Date: December 1931
Creator: Jacobs, Eastman N. & Pinkerton, Robert M.
Partner: UNT Libraries Government Documents Department
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The effectiveness of a double-stem injection valve in controlling combustion in a compression-ignition engine

Description: 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 b… more
Date: December 1931
Creator: Spanogle, J. A. & Whitney, E. G.
Partner: UNT Libraries Government Documents Department
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The effect of small variations in profile of airfoils

Description: This report deals with the effect of small variations in ordinates specified by different laboratories for the airfoil section. This study was made in connection with a more general investigation of the effect of small irregularities of the airfoil surface on the aerodynamic characteristics of an airfoil. These tests show that small changes in airfoil contours, resulting from variations in the specified ordinates, have a sufficiently large effect upon the airfoil characteristics to justify the … more
Date: January 1931
Creator: Ward, Kenneth E.
Partner: UNT Libraries Government Documents Department
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Performance of a compression-ignition engine with a precombustion chamber having high-velocity air flow

Description: Presented here are the results of performance tests made with a single-cylinder, four stroke cycle, compression-ignition engine. These tests were made on a precombustion chamber type of cylinder head designed to have air velocity and tangential air flow in both the chamber and cylinder. The performance was investigated for variable load and engine speed, type of fuel spray, valve opening pressure, injection period and, for the spherical chamber, position of the injection spray relative to the a… more
Date: October 1931
Creator: Spanogle, J. A. & Moore, C. S.
Partner: UNT Libraries Government Documents Department
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Lift and drag characteristics of a cabin monoplane determined in flight

Description: From Summary: "The results of flight tests conducted by the NACA to determine the lift and drag characteristics of a full-scale airplane are given herein. A Fairchild FC-2W2 cabin monoplane having a Gottingen 387 wing section was used for the tests. The maximum lift coefficient for the airplane is compared with that obtained for the Gottingen 387 airfoil in recent tests in the Variable Density Tunnel. The maximum lift coefficient for the airplane was found to be 1.50 and that for the airfoil 1.… more
Date: January 1931
Creator: Thompson, F. L. & Keister, P. H.
Partner: UNT Libraries Government Documents Department
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The interference effects on an airfoil of a flat plate at mid-span position

Description: "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 wit… more
Date: December 1931
Creator: Ward, Kenneth E.
Partner: UNT Libraries Government Documents Department
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The Behavior of Conventional Airplanes in Situations Thought to Lead to Most Crashes

Description: Simple flight tests were made on ten conventional airplanes for the purpose of determining their action in two situations, which are generally thought to precede and lead to a large proportion of airplane crashes. These situations are when in an attempt to stretch the glide in a forced landing, the airplane is stalled, and when while taking off, particularly if taking off steeply, the engine fails at a low altitude.
Date: February 1931
Creator: Weick, Fred E.
Partner: UNT Libraries Government Documents Department
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Tests in the Variable Density Wind Tunnel to Investigate the Effects of Scale and Turbulence on Airfoil Characteristics

Description: "The effect of scale and turbulence on the lift and drag of five airfoils the NACA 0006, the NACA 0021, the Clark Y and the USA 35-A, and the USN PS6, have been investigated in the Variable Density Wind Tunnel of the NACA. Tests were made over a wide scale range for only two different conditions of turbulence. Because of the limited scope of the tests, no general conclusions have been drawn, but it is indicated that increasing either turbulence or scale eliminates the discontinuities in the lif… more
Date: February 1931
Creator: Stack, John
Partner: UNT Libraries Government Documents Department
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A method for reducing the temperature of exhaust manifolds

Description: From Summary: "This report describes tests conducted at the Langley Memorial Aeronautical Laboratory on an "air-inducting" exhaust manifold for aircraft engines. The exhaust gases from each cylinder port are discharged into the throat of an exhaust pipe which has a frontal bellmouth. Cooling air is drawn into the pipe, where it surrounds and mixes with the exhaust gases. Temperatures of the manifold shell and of the exhaust gases were obtained in flight for both a conventional manifold and the … more
Date: September 1931
Creator: Schey, Oscar W. & Young, Alfred W.
Partner: UNT Libraries Government Documents Department
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Tests of N.A.C.A. airfoils in the variable-density wind tunnel Series 43 and 63

Description: This note is one of a series covering an investigation of a family of related airfoils. It gives in preliminary form 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 43 series, has a maximum mean camber of 4 per cent of the chord at a position 0.3 of the chord from the leading edge; the other group, the 63 series, has a maximum mean camber of 6 per cent of the chord at the same position. The members within each group… more
Date: September 1931
Creator: Jacobs, Eastman N. & Pinkerton, Robert M.
Partner: UNT Libraries Government Documents Department
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A comparison of the aerodynamic characteristics of the normal and three reflexed airfoils in the variable density wind tunnel

Description: "An investigation was made of the aerodynamic effects of reflexing the trailing edge of three commonly used airfoils. Six airfoils were used in the investigation: three having the normal profiles of the Navy 60, the Boeing 106, and the Gottingen 398, and three having these profiles modified to obtain a reflexed trailing edge with the mean camber line changed to give Cmc/4=0. The tests were conducted at a value of the Reynolds Number of approximately 3,100,000 in the variable density wind tunnel… more
Date: August 1931
Creator: DeFoe, George L.
Partner: UNT Libraries Government Documents Department
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The N.A.C.A. Apparatus for Studying the Formation and Combustion of Fuel Sprays and the Results From Preliminary Tests

Description: Described here is an apparatus for studying the formation and combustion of fuel sprays under conditions closely simulating those in a high speed compression-ignition engine. The apparatus consists of a single-cylinder modified test engine, a fuel injection system so designed that a single charge of fuel can be injected into the combustion chamber, an electric driving motor, and a high-speed photographic apparatus. When the fuel is injected into the combustion chamber, motion pictures at the ra… more
Date: September 1931
Creator: Rothrock, A. M.
Partner: UNT Libraries Government Documents Department
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Tests of N.A.C.A. airfoils in the variable-density wind tunnel Series 45 and 65

Description: "This note is one of a series covering an investigation of a number of related airfoils. It presents the results obtained from tests in N.A.C.A. Variable-Density Wind Tunnel of two groups of six airfoils each. One group, the 45 series, has a maximum mean camber of 4 per cent of the chord at a position 0.5 of the chord behind the leading edge, and the other group, the 65 series, has a maximum mean camber of 6 per cent of the chord at the same position. The members within each group differ only i… more
Date: September 1931
Creator: Jacobs, Eastman N. & Pinkerton, Robert M.
Partner: UNT Libraries Government Documents Department
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An Investigation of Cotton for Parachute Cloth

Description: "This is a resume of the work of the Bureau of Standards on a cotton parachute cloth for use as a substitute for silk in the event of an emergency curtailing the supply. Cotton yarn of high strength in proportion to its weight and otherwise specially suitable for parachute cloth was developed. Cloth woven from this yarn in the bureau mill was equal or superior to parachute silk in strength and tear resistance, met the requirements with respect to air permeability, and weighed only a few tenths … more
Date: September 1931
Creator: Appel, William D. & Worner, R. K.
Partner: UNT Libraries Government Documents Department
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The pressure distribution over a square wing tip on a biplane in flight

Description: This note presents the results obtained in pressure distribution tests on the right upper panel of a Douglas M-3 airplane in flight. These tests are a part of an extensive investigation on the effect of changes in tip shape on the load distribution.
Date: January 1931
Creator: Rhode, Richard V. & Lundquist, Eugene E.
Partner: UNT Libraries Government Documents Department
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The prevention of ice formation on gasoline tank vents

Description: "This investigation was conducted in the refrigerated wind tunnel at the Langley Memorial Aeronautical Laboratory, Langley Field, Va., to determine a suitable method for preventing the formation of ice on the vents of airplane gasoline tanks. Tests were made on a variety of vent forms arranged in a number of different orientations relative to the direction of the air stream. Both the size of the tube and its orientation were found to be of great importance. Small tubes, under equal circumstance… more
Date: October 1931
Creator: Theodorsen, Theodore & Clay, William C.
Partner: UNT Libraries Government Documents Department
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Advantages of Oxide Films as Bases for Aluminum Pigmented Surface Coatings for Aluminum Alloys

Description: 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.
Partner: UNT Libraries Government Documents Department
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The effect of slots and flaps on the lift and drag of the McDonnell Airplanes determined in flight

Description: 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 fla… more
Date: November 1931
Creator: Soulé, Hartley A.
Partner: UNT Libraries Government Documents Department
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Interference effects and drag of struts on a monoplane wing

Description: "Tests were conducted in the Variable Density Wind Tunnel of the NACA to determine the importance of the interference effects and drag of struts on a monoplane. Inclined struts were placed upon a Gottingen 387 airfoil in the lower surface positions and in two upper surface positions. Tests were made at values of Reynolds Number comparable with those obtained in flight. It was found that the interference drag of struts may be as great as the drag of the struts alone" (p. 1).
Date: February 1931
Creator: Ward, Kenneth E.
Partner: UNT Libraries Government Documents Department
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Torsion in box wings

Description: From Summary: "Logical analysis of a box wing necessitates the allowance for the contribution of the drag spars to the torsional strength of the structure. A rigorous analysis is available in the use of the Method of Least Work. The best logical method of analysis is that applying Prandtl's Membrane Analogy. The results so obtained vary by a negligible amount from those obtained by the rigorous method."
Date: February 1931
Creator: Wheatley, John B.
Partner: UNT Libraries Government Documents Department
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Penetration and Duration of Fuel Sprays From a Pump Injection System

Description: "High-speed motion pictures were taken of individual fuel sprays from a pump injection system. The changes in the spray-tip penetration with changes in the pump speed, injection-valve opening and closing pressures, discharge-orifice area, injection-tube length and diameter, and pump throttle setting were measured. In addition, the effects of the variables on the time lag and duration of injection can be controlled by the dimensions of the injection tube, the area of the discharge orifice, and t… more
Date: October 1931
Creator: Rothrock, A. M. & Marsh, E. T.
Partner: UNT Libraries Government Documents Department
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Copper Deposits Near Keating, Oregon

Description: From abstract: The copper deposits near Keating, Oreg., in the southwestern foothills of the Wallowa Mountains, form part of a series distributed along a belt over 75 miles long. The belt containing copper deposits extends from a point west of North Powder to and beyond the Snake River at Homestead.
Date: 1931
Creator: Gilluly, James
Partner: UNT Libraries Government Documents Department
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The Jackson Gas Field, Hinds and Rankin Counties, Mississippi

Description: From abstract: The Jackson gas field, in Hinds and Rankin Counties, Miss., is in the eastern Gulf Coastal Plain, about 160 miles north of New Orleans and 40 miles, east of the Mississippi River at Vicksburg. The gas is produced from a Cretaceous chalk from 2,088 to 2,236 feet below sea level. Overlying the chalk is the regular sequence of Tertiary rocks found in Mississippi. On the crest of the anticline in the city of Jackson the Cockfield formation of the Claiborne group is exposed, surrounde… more
Date: 1931
Creator: Monroe, Watson Hiner
Partner: UNT Libraries Government Documents Department
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Limits of Inflammability of Gases and Vapors

Description: From Definitions: "It is the object of this paper to present the results of a critical review of all figures published on the limits of inflammability of combustible gases and vapors when in admixture with air, oxygen, or other "atmosphere." Suspended dusts and liquid mists are not considered."
Date: 1931
Creator: Coward, H. F. & Jones, G. W.
Partner: UNT Libraries Government Documents Department
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