This system will be undergoing maintenance July 5th between 8:00AM and 12:00PM CDT.

Search Results

open access

Drag measurements of two thin wing sections at different index values

Description: It is stated that the index value 6000, as found in normal tests of wing sections with a 20 cm chord, falls in the same region where the transition of laminar to turbulent flow takes place on thin flat plates. It is to be expected that slightly cambered, thin wing sections will behave similarly. The following test of two such wing sections were made for the purpose of verifying this supposition.
Date: June 1927
Creator: Ackeret, J.
Partner: UNT Libraries Government Documents Department
open access

Experiments on airfoils with trailing edge cut away

Description: "Airfoils with their trailing edge cut away are often found on aircraft, as the fins on the hulls of flying boats and the central section of the wings for affording better visibility. It was therefore of some interest to discover the effect of such cutaways on the lift and drag and on the position of the center of pressure. For this purpose, systematic experiments were performed on two different airfoils, a symmetrical airfoil and an airfoil of medium thickness, with successive shortenings of their chords" (p. 1).
Date: September 1927
Creator: Ackeret, J.
Partner: UNT Libraries Government Documents Department
open access

Coal-Mine Fatalities in the United States, 1926

Description: Report compiled by the U.S. Bureau of Mines including statistics on fatalities in coal mines located in the United States as well as data regarding the various operations (e.g., number of miners employed and average production). The information is organized into tables for comparison and the text draws some overall conclusions in the summary.
Date: 1927
Creator: Adams, William W.
Partner: UNT Libraries Government Documents Department
open access

Metal-Mine Accidents in the United States During the Calendar Year 1925

Description: Report issued by the U.S. Bureau of Mines covering accidents that happened in metal mines located in the United States including statistics for injuries, fatalities, kinds and causes of accidents, and operational data, such as number of mine workers and shifts worked.
Date: 1927
Creator: Adams, William W.
Partner: UNT Libraries Government Documents Department
open access

Quarry Accidents in the United States During the Calendar Year 1925

Description: Report published by the U.S. Bureau of Mines which is a compilation of accidents in quarries located in the United States with data regarding the number and kinds of accidents as well as information about the mining operations (e.g., number of men employed, kinds of quarries, amount of work performed, etc.).
Date: 1927
Creator: Adams, William W.
Partner: UNT Libraries Government Documents Department
open access

Mining of Thin Coal Beds in the Anthracite Region of Pennsylvania

Description: Report issued by the Bureau of Mines over studies conducted on thin coal beds of the anthracite region in Pennsylvania. Results of the studies are presented and discussed. This report includes tables, maps, illustrations, and photographs.
Date: 1927
Creator: Ashmead, Dever C.
Partner: UNT Libraries Government Documents Department
open access

The N.A.C.A. photographic apparatus for studying fuel sprays from oil engine injection valves and test results from several researches

Description: "Apparatus for recording photographically the start, growth, and cut-off of oil sprays from injection valves has been developed at the Langley Memorial Aeronautical Laboratory. The apparatus consists of a high-tension transformer by means of which a bank of condensers is charged to a high voltage. The controlled discharge of these condensers in sequence, at a rate of several thousand per second, produces electric sparks of sufficient intensity to illuminate the moving spray for photographing. The sprays are injected from various types of valves into a chamber containing gases at pressures up to 600 pounds per square inch" (p. 361).
Date: May 25, 1927
Creator: Beardsley, Edward G.
Partner: UNT Libraries Government Documents Department
open access

Experiments on Airfoils With Aileron and Slot

Description: The present report contains the results of a few experiments on three airfoils to which the rear portions, having chords respectively 1/4, 1/3, and 2/5 of the total chords, are hinged so as to form ailerons, especial attention being given to the shape of the slot between the aileron and the main portion of the aileron.
Date: November 1927
Creator: Betz, A.
Partner: UNT Libraries Government Documents Department
open access

Recent Suggestions in Diesel-Engine Construction

Description: Different methods for increasing the efficiency of diesel engines are presented and some new designs are given.
Date: August 1927
Creator: Bielefeld, F. Ernst
Partner: UNT Libraries Government Documents Department
open access

Calculating Thrust Distribution and Efficiency of Air Propellers

Description: I am now proposing a method for the preliminary approximate calculation of the thrust distribution and efficiency of air propellers under any operating conditions. Our task becomes the following, namely, to determine the speed relations and the forces developed on a section with a given direction and velocity of the air current, a problem which can be solved with the aid of the momentum theory.
Date: December 1927
Creator: Bienen, Theodor
Partner: UNT Libraries Government Documents Department
open access

Problems in the Firing of Refractories

Description: From Introduction: "In large measure the work was an outgrowth of that done by the bureau in the investigation of burning problems for Four Heavy Clay Products Associations."
Date: 1927
Creator: Bole, G. A.; Blizard, John; Rice, W. E.; Ogden, E. P. & Sherman, R. A.
Partner: UNT Libraries Government Documents Department
open access

Quarry Problems in the Lime Industry

Description: From Introduction: "The purpose of this bulletin is not to describe individual quarries but to describe general methods of operation and give typical illustrations. The methods employed are discussed critically in an effort to elucidate the best working principles and to assist manufactures of lime in correcting errors and establishing their industry on the most economical and efficient basis."
Date: 1927
Creator: Bowles, Oliver & Myers, W. M.
Partner: UNT Libraries Government Documents Department
open access

The Corrosion of Magnesium and of the Magnesium Aluminum Alloys Containing Manganese

Description: "The extensive use of magnesium and its alloys in aircraft has been seriously handicapped by the uncertainties surrounding their resistance to corrosion. This problem has been given intense study by the American Magnesium Corporation and at the request of the Subcommittee on Materials for Aircraft of the National Advisory Committee for Aeronautics this report was prepared on the corrosion of magnesium" (p. 419).
Date: 1927
Creator: Boyer, J. A.
Partner: UNT Libraries Government Documents Department
open access

Pressure distribution over airfoils at high speeds

Description: This report deals with the pressure distribution over airfoils at high speeds, and describes an extension of an investigation of the aerodynamic characteristics of certain airfoils which was presented in NACA Technical Report no. 207. The results presented in report no. 207 have been confirmed and extended to higher speeds through a more extensive and systematic series of tests. Observations were also made of the air flow near the surface of the airfoils, and the large changes in lift coefficients were shown to be associated with a sudden breaking away of the flow from the upper surface. The tests were made on models of 1-inch chord and comparison with the earlier measurements on models of 3-inch chord shows that the sudden change in the lift coefficient is due to compressibility and not to a change in the Reynolds number. The Reynolds number still has a large effect, however, on the drag coefficient. The pressure distribution observations furnish the propeller designer with data on the load distribution at high speeds, and also give a better picture of the air-flow changes.
Date: 1927
Creator: Briggs, L. J. & Dryden, H. L.
Partner: UNT Libraries Government Documents Department
open access

Aero Dopes and Varnishes

Description: Report discussing before proceeding to discuss the preparation of dope solutions, it will be necessary to consider some of the essential properties which should be possessed of a dope film, deposited in and on the surface of an aero fabric. The first is that it should tighten the material and second it should withstand weathering.
Date: July 1927
Creator: Britton, H. T. S.
Partner: UNT Libraries Government Documents Department
open access

Electrical characteristics of spark generators for automotive ignition

Description: From Summary: "This paper reports the results of an extensive program of measurements on 11 ignition systems differing widely in type. The results serve primarily to give representative data on the electric and magnetic constants of such systems, and on the secondary voltage produced by them under various conditions of speed, timing, shunting resistance, etc. They also serve to confirm certain of the theoretical formulas which have been proposed to connect the performance of such systems with their electrical constants, and to indicate the extent to which certain simplified model circuits duplicate the performance of the actual apparatus."
Date: 1927
Creator: Brode, R. B.; Randolph, D. W. & Silsbee, F. B.
Partner: UNT Libraries Government Documents Department
open access

Tables for calibrating altimeters and computing altitudes based on the standard atmosphere

Description: From Summary: "During 1925 the assumption of an isothermal atmosphere which was in general use as the standard for the calibration of altimeters in the United States was replaced by a standard atmosphere which assumes an altitude-temperature relation closely corresponding to the average of upper air observations at latitude 40 degrees in this country. The same standard atmosphere had already been adopted somewhat earlier in the United States as the aircraft performance standard. National Advisory Committee for Aeronautics Technical Reports nos. 147 and 218 give necessary constants, tables, and information. However, neither of these reports includes all of the tables required for the computation of actual altitudes nor those readily suitable for use in calibrating altimeters, since the altitude intervals for which data are given are not sufficiently small."
Date: 1927
Creator: Brombacher, W. G.
Partner: UNT Libraries Government Documents Department
open access

Safety in Airplane Flight

Description: This report presents methods to reduce the incidence of aviation accidents. Some of the methods discussed include enlistment and training of aviators, improvement of controls and control surfaces, and upgrading of power plants.
Date: November 1927
Creator: Brunat, H.
Partner: UNT Libraries Government Documents Department
open access

Building a Full-Size Glider

Description: The building and flying of a glider is possible for anyone who can use a few basic tools. This report presents some plans and techniques for building your own glider.
Date: September 1927
Creator: Camm, F. J.
Partner: UNT Libraries Government Documents Department
open access

Aerodynamic laboratory at Cuatro Vientos

Description: This report presents a description of the design of the Cuatro Vientes wind tunnel.
Date: June 1927
Creator: Caracciolo, Moreno
Partner: UNT Libraries Government Documents Department
open access

A Comparison of the Take-Off and Landing Characteristics of a Number of Service Airplane

Description: "This investigation, which is a continuation of Technical Report 154, follows very closely the earlier methods and covers a number of service airplanes, whereas the previous report covered but one, the JN-4H. In addition to the air speed, acceleration, and control positions as given in report no. 154, information is here given regarding the distance run and the ground speed for the various airplanes during the two maneuvers" (p. 457).
Date: 1927
Creator: Carroll, Thomas
Partner: UNT Libraries Government Documents Department
open access

Development, Mining, and Handling of Ore in Folded and Faulted Areas, Red Iron Mines, Birmingham District, Alabama

Description: Technical paper issued by the Bureau of Mines over mining of red iron ores in Birmingham, Alabama. As stated in the introduction, "the present paper deals more specifically with the development and handling of ore as affected by folds and faults in the ore bed, and considers changes that may be desirable or necessary in future mining practices" (p. 2). This paper includes illustrations, and photographs.
Date: 1927
Creator: Crane, W. R.
Partner: UNT Libraries Government Documents Department
open access

Characteristics of Five Propellers in Flight

Description: "This investigation was made for the purpose of determining the characteristics of five full-scale propellers in flight. The equipment consisted of five propellers in conjunction with a VE-7 airplane and a Wright E-2 engine. The propellers were of the same diameter and aspect ratio. Four of them differed uniformly in thickness and pitch and the fifth propeller was identical with one of the other four with exception of a change of the airfoil section" (p. 267).
Date: November 8, 1927
Creator: Crowley, J. W., Jr. & Mixson, R. E.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen