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The flexible mounting of an airplane engine

Description: Discussed here is the suggested installation of the 'unbalanced' 8-cylinder VE-engine. The suggestion was that a flexible mounting be used instead of bolting the engine rigidly to the airplane structure. It was concluded that a flexible connection between the engine and the airplane is probably possible. A flexible connection primarily diminishes the vibrations due to inertia and, to a lesser degree, those due to torque variation. However, engines vibrate more when freely suspended than when rigidly mounted, and this vibration has a detrimental effect on all connections between the engine and the airplane. Therefore, in view of the relatively insignificant advantages which may be derived from the elastic suspension of the engine, the present rigid mounting is to be preferred. Vibration reduction can be achieved by incorporating in the fuselage as many of the rigid airplane parts as possible.
Date: July 1923
Creator: Kutzbach, K.
Partner: UNT Libraries Government Documents Department

An instrument for recording the position of airplane control surfaces

Description: N.A.C.A. has developed an instrument which makes a continuous record of the angular position of the control surfaces of an airplane, not only in steady flight but during acrobatics as well. It has proven useful in researches into stability and controllability, and from records obtained from it many otherwise obscure details of piloting technique have been available for the instruction of pilots, from novices to seasoned experts.
Date: August 1923
Creator: Ronan, K. M.
Partner: UNT Libraries Government Documents Department

Inherent stability of helicopters

Description: The equilibrium, in still air, of a "stationary" helicopter (i.e., of one having neither vertical nor translational velocity, but a tendency to remain practically motionless within restricted limits of space) presents some difficulty in practice and justifies a theoretical investigation of its "inherent stability," i.e., independent of the pilot.
Date: October 1923
Creator: Crocco, G. Arturo
Partner: UNT Libraries Government Documents Department

The new French high-speed wind tunnel

Description: The plans for the wind tunnel at Issey-les-Moulineaux are discussed in relation to concerns about the Law of Similitude and propeller speed.
Date: May 1923
Creator: Robert
Partner: UNT Libraries Government Documents Department

The new interpretation of the laws of air resistance

Description: A closer examination of Newton's formula for air resistance shows that it is well to consider the air as an ordinary fluid, and, indeed for most of the velocities considered, as a non-compressible fluid, so long as the dimensions of the moving body are large in comparison with the mean free path of the particles of air.
Date: April 1923
Creator: Prandtl, L.
Partner: UNT Libraries Government Documents Department

Preliminary study of the damping factor in roll

Description: This paper constitutes a general theoretical discussion of the damping factor in roll, together with the results of wind tunnel tests on the continuous rolling of U.S.A. 30 airfoil.
Date: October 1923
Creator: Shoemaker, James M. & Lee, John G.
Partner: UNT Libraries Government Documents Department

Lift and drag effects of wing-tip rake

Description: This report deals with a description and report of tests carried out at the Washington Navy Yard on models of the RAF-6, albatross and Slone airfoils to determine the effectiveness of the conventional wing-trailing edge being always longer than the leading edge. The results are compared with the values computed by standard formulae in use at the time the tests were conducted.
Date: 1923
Creator: Zahm, A. F.; Bear, R. M. & Hill, G. C.
Partner: UNT Libraries Government Documents Department

Lessons of the 1922 Rhön soaring flights

Description: Innovations in design and technique from the Rhön soaring contest are presented in this report.
Date: February 1923
Creator: Prandtl, L.
Partner: UNT Libraries Government Documents Department

Determination of climbing ability

Description: The vertical distribution of the pressure, temperature, and density of the atmosphere varies from day to day. Thus, rates of climb on different days cannot be compared directly, but must be corrected with reference to a standard rate of diminution of air density with increasing altitude. The following problem, therefore, has to be solved. An airplane has climbed on a certain day under prevailing atmospheric conditions as shown by the barograph. How would the same airplane climb in a standard atmosphere? This problem has already been dealt with by Everling, using the monthly and yearly mean of the vertical temperature distribution. Von Mises solved the problem by arithmetical methods. Here, conditions are examined which shorten or lengthen the climbing time. In establishing the corrected barogram, computation seems more practical than graphical treatment. The basis of the answer to the question answered here is summed up in the remark that lift, drag, propeller thrust, and torque and engine power depend only on the density of the air and do not change with the pressure and temperature, provided that the density remains constant.
Date: November 1923
Creator: Blasius, H.
Partner: UNT Libraries Government Documents Department

Results of experimental flights at high altitudes with Daimler, Benz and Maybach engines to determine mixture formation and heat utilization of fuel

Description: The experimental flights described herein were made with the object of obtaining information regarding the following two questions, which as yet have not been sufficiently elucidated. These are: 1. What effect has altitude upon the formation of the mixture? 2. What alteration takes place, with increasing altitude, in the utilization of the heat contained in the fuel?.
Date: January 1923
Creator: Kutzbach, K.
Partner: UNT Libraries Government Documents Department

Standardization and aerodynamics

Description: Report presenting suggestions for the standardization of the study of aerodynamics in laboratories in the United States and Europe. A report by each of the different scientists, all of whom are working in a variety of different labs and countries, is provided, and each discusses the progress made in their respective labs and their suggestions for standardization and progress in the field.
Date: March 1923
Creator: Knight, William; Prandtl, L.; von Karman; Costanzi, G.; Margoulis, W.; Verduzio, R. et al.
Partner: UNT Libraries Government Documents Department

Comparison of Gas Masks, Hose Masks, and Oxygen-Breathing Apparatus

Description: Report providing information about the most appropriate kinds of breathing apparatus -- gas masks, hose masks, or self-contained oxygen-breathing apparatus -- to use in different situations.
Date: June 1923
Creator: Katz, S. H. & Bourquin, J. J.
Partner: UNT Libraries Government Documents Department

Carbon Tetrachloride Extinguisher of Electric Fires

Description: Report discussing "the extent and nature of the hazards to firefighters from gases and smoke resulting from the application of carbon tetrachloride extinguisher to electric arcs, burning insulation or fires such as may occur in electrical apparatus and machinery. The experiments described were made for the purpose of determining the nature of gases and smoke and ascertaining their toxic properties" (p. 1).
Date: July 1923
Creator: Katz, S. H.; Gleim, E. J. & Bloomfield, J. J.
Partner: UNT Libraries Government Documents Department

Production and Briquetting of Carbonized Lignite

Description: From Introduction: "The Bureau of Mines since its establishment has always taken an active interest in the utilization of lignite and in the development of the lignite deposits of the United States. Extensive lignite fields occur in the west central States, notably in North Dakota, Montana, Wyoming, Colorado, and Texas; there are smaller areas in several other Sates, some of which are widely separated."
Date: 1923
Creator: Babcock, E. J. & Odell, W. W.
Partner: UNT Libraries Government Documents Department

Bibliography of Petroleum and Allied Substances, 1921

Description: From Introduction: "This bulletin is the sixth in the series of petroleum bibliographies published by the Bureau of Mines, Bulletins 149, 165, 180, 189, and 216 being compilations for the years 1915, 1916, 1917, 1918, and 1919-20 respectively. In this bulletin the same general plan has been followed in arranging the references, but one or two additions have been made in the classification."
Date: 1923
Creator: Burroughs, E. H.
Partner: UNT Libraries Government Documents Department

An Investigation of Powdered Coal as Fuel for Power-Plant Boilers: Tests at Oneida Street Power Station, Milwaukee, Wisconsin

Description: From Introduction: "This bulletin presents the results of 36 tests made on a 468-horse-power Edge Moor boiler fired with pulverized coal at the Oneida Street Station of the Milwaukee Electric Railway & Light Co., Milwaukee, Wis."
Date: 1923
Creator: Kreisinger, Henry; Blizard, John; Augustine, C. E. & Cross, B. J.
Partner: UNT Libraries Government Documents Department

Analytical Methods for Certain Metals Including Cerium, Thorium, Molybdenum, Tungsten, Radium, Uranium, Vanadium, Titanium and Zirconium

Description: From Introduction: "This chapter indicates the methods of determining several of the alloy metals when occurring together in the same sample. Most materials seldom contain more than two or three of these elements, but considerable time may be saved if determinations can be combined. Details of the analyses and separations are not given here, as they have been covered more fully in other chapters. Whenever possible, reference is made to the particular chapter. Only sufficient directions have been given to outline the method of procedure, actual conditions for the separations being presented on other pages."
Date: 1923
Creator: Moore, R. B.; Lind, S. C.; Marden, J. W.; Bonardi, J. P.; Davis, C. W. & Conley, J. E.
Partner: UNT Libraries Government Documents Department

Preparation, Transportation, and Combustion of Powdered Coal

Description: From Introduction: "In the following pages the writer has endeavored to give an account of the many methods, advantages, and disadvantages of preparing and burning powdered coal."
Date: 1923
Creator: Blizard, John
Partner: UNT Libraries Government Documents Department

Investigation of Toxic Gases from Mexican and other High-Sulphur Petroleums and Products: Report by the Bureau of Mines, Department of the Interior, to the American Petroleum Institute

Description: From Scope of the Work and Findings: "The work was divided into two parts, namely, field work and laboratory investigations. The most interesting and important of the laboratory investigations. The most interesting and important of the laboratory findings were: (1) The presence of hydrogen sulphide (H2S) in the gases and vapors from light Mexican crude; (2) the extreme toxicity of H2S; (3) the absence of arsine, stibine, phosgene, hydrocyanic acid, and other toxic substances; (4) treatment recommended for poisoning by H2S; (5) use and limitations of oxygen breathing apparatus, hose masks, and gas masks."
Date: 1923
Creator: Sayres, R. R.; Smith, N. A. C.; Fieldner, A. C.; Mitchell, C. W.; Jones, G. W.; Yant, W. P. et al.
Partner: UNT Libraries Government Documents Department