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Maneuverability investigation of an F6C-4 fighting airplane

Description: "In order to compare the relative maneuverability of two fighting airplanes and to accumulate additional data to assist in establishing a satisfactory criterion for the maneuverability of any airplane, the National Advisory Committee for Aeronautics has conducted maneuverability investigations on the F6C-3 (water-cooled engine) and the F6C-4 (air-cooled engine) airplanes. The investigation made on the F6C-3 airplane was reported in NACA-TR-369. This report contains the results of the investigation made on the F6C-4 airplane" (p. 475).
Date: December 12, 1930
Creator: Dearborn, C. H. & Kirschbaum, H. W.
Partner: UNT Libraries Government Documents Department

A balanced diaphragm type of maximum cylinder pressure indicator

Description: A balanced diaphragm type of maximum cylinder pressure indicator was designed to give results consistent with engine operating conditions. The apparatus consists of a pressure element, a source of controlled high pressure and a neon lamp circuit. The pressure element, which is very compact, permits location of the diaphragm within 1/8 inch of the combustion chamber walls without water cooling. The neon lamp circuit used for indicating contact between the diaphragm and support facilitates the use of the apparatus with multicylinder engines.
Date: December 1930
Creator: Spanogle, J. A. & Collins, John H., Jr.
Partner: UNT Libraries Government Documents Department

English Airplane Construction

Description: English airplane construction is presented with a particular emphasis on metal construction techniques. Steel rib and fuselage construction are discussed as well as the use of duralumin in construction.
Date: December 1930
Creator: Schwencke, D.
Partner: UNT Libraries Government Documents Department

Experiments with a model water tunnel

Description: This report describes a model water tunnel built in 1928 by the NACA to investigate the possibility of using water tunnels for aerodynamic investigations at large scales. The model tunnel is similar to an open-throat wind tunnel, but uses water for the working fluid.
Date: December 1930
Creator: Jacobs, Eastman N. & Abbott, Ira H.
Partner: UNT Libraries Government Documents Department

Riveting in Metal Airplane Construction Part 1 : Riveting Methods and Equipment in German Metal Airplane Construction

Description: "Although all constructors in Germany use duralumin quite frequently, and prefer cold riveting exclusively for permanent (nondetachable) connections of individual structural components, their methods and equipment are very diversified. The differences are due to a great extent to the diversity of structural types and to the special shapes of the individual subassemblies. The results is that different manufacturers have developed totally different riveting methods, as well as entirely different working methods" (p. 1).
Date: December 1930
Creator: Pleines, Wilhelm
Partner: UNT Libraries Government Documents Department

Riveting in Metal Airplane Construction Part 2: Riveting Methods and Equipment (Concluded), Strength of Riveted Joints in Duralumin

Description: This report includes descriptive material on rivet inspection, types of rivets and sizes. Tabular data on shearing strength of rivets at failure, ultimate shear of various rivets, tensile tests of rivet plate, and tensile strength values of riveted joints are provided.
Date: December 1930
Creator: Pleines, Wilhelm
Partner: UNT Libraries Government Documents Department

Riveting in Metal Airplane Construction Part 3: Strength of Riveted Joints in Duralumin (Continued), Test Installation and Arrangement

Description: This report includes strength of riveted joints in duralumin, descriptions of test procedure and results of tests. Tabulated data includes: curshing strength by failure for various conditions, shearing strength of hole edge zone in direction of tearing, tearing strengths of plates weakened by rivet holes, and enlargement of holes at beginning of break.
Date: December 1930
Creator: Pleines, Wilhelm
Partner: UNT Libraries Government Documents Department

Riveting in Metal Airplane Construction Part 4: Strength of Riveted Joints in Duralumin (Concluded), Comparative Tests With Riveted Joints

Description: Tests were made to determine the crushing strength of a riveted joint, in order to define the difference in crushing stregth between a strictly bolted joint and a riveted joint. The object was to tabulate the crushing strength by failure on various plate thicknesses for a one-rivet double-shear riveted joint.
Date: December 1930
Creator: Pleines, Wilhelm
Partner: UNT Libraries Government Documents Department

Full-scale tests of metal propellers at high tip speeds

Description: This report describes tests of 10 full-scale metal propellers of several thickness ratios at various tip speeds up to 1,350 feet per second. The results indicate no loss of efficiency up to tip speeds of approximately 1,000 feet per second. Above this tip speed the loss is at a rate of about 10 per cent per 100 feet per second increase relative to the efficiency at the lower speeds for propellers of pitch diameter ratios 0.3 to 0.4. Propellers having sections of small thickness ratio can be run at slightly higher speeds than thick ones before beginning to lose efficiency.
Date: November 5, 1930
Creator: Wood, Donald H.
Partner: UNT Libraries Government Documents Department

Lamb as You Like It.

Description: Describes uses for lamb meat in meals; provides recipes and methods for its preparation in various dishes.
Date: November 1930
Creator: Alexander, Lucy M. (Lucy Maclay), 1888-
Partner: UNT Libraries Government Documents Department

Mathematical treatise on the recovery from a flat spin

Description: In this mathematical investigation, made in collaboration with Dr. Wilhelm Schmidt, we interpret the temporary change (due to some disturbance) in the quantities which define the position of the airplane while in a flat spin. We further examine the effect of this change, of the means resorted to to produce the disturbance, and thus reveal the expedients available for recovering from a flat spin.
Date: November 1930
Creator: Fuchs, R.
Partner: UNT Libraries Government Documents Department

Metal Covering of Airplanes

Description: This paper presents a relative determination of the wrinkling of a plate wall beam with variable number of supports and methods of attachment. The discussion is based entirely on tests with extensometer readings and number of wrinkles, with complete web and with cutout sections. The author notes that the number of corrugations increase with added stress, keeping constant edge spacing.
Date: November 1930
Creator: Mathar, J.
Partner: UNT Libraries Government Documents Department

Practical Tests With The "Auto Control Slot" Part 1: Lecture

Description: "The effect of a slotted wing depends essentially on the fact that a secondary flow branches off from the main flow and passes to the suction side of the profile. It is thus possible to delay the separation greatly and increase the lift. The practical aspect of the slotted wing is less known in Germany, especially the results obtained during the last three years since the introduction of the 'auto control slot'" (p. 1).
Date: November 1930
Creator: Lachmann, G.
Partner: UNT Libraries Government Documents Department

Practical Tests With The "Auto Control Slot" Part 2: Discussion

Description: "For some time the D.V.L. has been investigating the question of applicability of Handley Page slotted wings to German airplanes. Comparitive gliding tests were made with open and closed slots on an Albatros L 75 airplane equipped with the Handley Page "auto control slots." This investigation served to determine the effect of the auto control slot on the properties and performances of airplanes at large angles of attack. The most important problems were whether the angle of glide at small angles of attack can be increased by the adoption of the auto control slot and, in particular, as to whether the flight characteristics at large angles of attack are improved thereby and equilibrium in gliding flight is guaranteed even at larger than ordinary angles of attack" (p. 1).
Date: November 1930
Creator: Lachmann, G.
Partner: UNT Libraries Government Documents Department

Riveted Joints in Thin Plates

Description: The method of riveting by forming the closing head under increasing pressure or by a series of hammer blows is investigated. The question as to the best edge distance, i.e. that distance from the rivet center to the plate edge below which it is unadvisable to go and, at the same time useless to go beyond, was examined. The slippage of plates which occurs under the effect of a certain stress, does not completely disappear on unloading.
Date: November 1930
Creator: Hilbes, W.
Partner: UNT Libraries Government Documents Department

Some Characteristics of Fuel Sprays From Open Nozzles

Description: "The penetration and cone-angle of fuel sprays from open nozzles were recorded with the NACA Spray Photography Equipment. The results show that for injection systems in which the rate of pressure rise at the discharge orifice is high, open nozzles give spray-tip velocities and penetrations which compare favorably with those of closed nozzles. The spray cone-angle was the same for all tests, although open nozzles having different orifice diameters were used, and one nozzle was used both as an open and as a closed nozzle" (p. 1).
Date: November 1930
Creator: Rothrock, A. M. & Lee, D. W.
Partner: UNT Libraries Government Documents Department