UNT Libraries Government Documents Department - 188 Matching Results

Search Results

Results: 1 - 24 next
open access

Coal-Mine Fatalities in the United States, 1927

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: 1928
Creator: Adams, William W.
Item Type: Refine your search to only Report
open access

Differential Pressures on a Pitot-Venturi and a Pitot-Static Nozzle Over 360 Degrees Pitch and Yaw

Description: "Measurements of the differential pressures on two navy air-speed nozzles, consisting of a Zahm type Pitot-Venturi tube and a SQ-16 two-pronged Pitot-static tube, in a tunnel air stream of fixed speed at various angles of pitch and yaw between 0 degrees and plus or minus 180 degrees. This shows for a range over -20 degrees to +20 degrees pitch and yaw, indicated air speeds varying very slightly over 2 per cent for the Zahm type and a maximum of about 5 per cent for the SQ-16 type from the calib… more
Date: 1928
Creator: Bear, R. M.
Item Type: Refine your search to only Report
open access

Some factors affecting the reproducibility of penetration and the cut-off of oil sprays for fuel-injection engines

Description: This investigation was undertaken at the Langley Memorial Aeronautical Laboratory in connection with a general research on fuel-injection for aircraft. The purpose of the investigation was to determine the factors controlling the reproducibility of spray penetration and secondary discharges after cut-off. The development of single sprays from automatic injection valves was recorded by means of special high-speed photographic apparatus capable of taking 25 consecutive pictures of the moving spra… more
Date: 1928
Creator: Beardsley, E. G.
Item Type: Refine your search to only Report
open access

Considerations on Propeller Efficiency

Description: The propeller cannot be considered alone, but the mutual interference between propeller and airplane must be considered. These difficulties are so great when the joint action of propeller and airplane is considered, that the aerodynamic laboratory at Gottingen originally abandoned the idea of applying the efficiency conception of the test results. These difficulties and the methods by which they are overcome are outlined in this report.
Date: September 1928
Creator: Betz, A.
Item Type: Refine your search to only Report
open access

Propeller Problems

Description: This report tries to give a comprehensive survey of the most important propeller problems such as the shape of propellers and the effect of atmospheric conditions on propeller performance.
Date: December 1928
Creator: Betz, A.
Item Type: Refine your search to only Report
open access

On the Take-Off of Heavily Loaded Airplanes

Description: This report examines the take-off conditions of airplanes equipped with tractive propellers, and particularly the more difficult take-off of airplanes heavily loaded per unit of wing area (wing loading) or per unit of engine power (power loading).
Date: November 1928
Creator: Breguet, Louis
Item Type: Refine your search to only Report
open access

Pressure element of constant logarithmic stiffness for temperature compensated altimeter

Description: From Summary: "The usual type of altimeter contains a pressure element, the deflections of which are approximately proportional to pressure changes. An evenly divided altitude scale is secured by using a mechanism between the pressure element and pointer which gives the required motion of the pointer. A temperature-compensated altimeter was constructed at the Bureau of Standards for the Bureau of Aeronautics of the Navy Department which contained a manually operated device for controlling the m… more
Date: August 7, 1928
Creator: Brombacher, W. G. & Cordero, F.
Item Type: Refine your search to only Report
open access

The torsional strength of wings

Description: This report describes a simple method for calculating the position of the elastic axis of a wing structure having any number of spars. It is shown that strong drag bracing near the top and bottom of a wing greatly increases the torsional strength. An analytical procedure for finding the contribution of the drag bracing to the torsional strength and stiffness is described, based upon the principle of least work, and involving only one unknown quantity. A coefficient for comparing the torsional r… more
Date: December 1928
Creator: Burgess, C. P.
Item Type: Refine your search to only Report
open access

A Dangerous Seaplane Landing Condition

Description: "A peculiar phenomena in seaplane landing is observed and reported. The seaplane having executed a normal fast landing at low incidence, a forward movement of the control stick effected an unusual condition in that the seaplane left the water suddenly in an abnormal attitude. The observations describing this phenomena are offered as a warning against possible accident and as a conjectural cause of seaplane landing accidents of a certain kind" (p. 1).
Date: May 1928
Creator: Carroll, Thomas
Item Type: Refine your search to only Report
open access

The Effect on Performance of a Cutaway Center Section

Description: "The assumption is made that a skeleton or cutaway center section is desirable for forward vision and to determine the effect of such mutilation upon performance the following work was done. The airplane used was a Vought VE-7 and in addition to the cutaway center section a system of end plates or fins was installed. Various conditions and combinations were investigated in level flight and in climb" (p. 1).
Date: January 1928
Creator: Carroll, Thomas
Item Type: Refine your search to only Report
open access

The Formation of Ice Upon Exposed Parts of an Airplane in Flight

Description: In order to experimentally study the conditions leading to ice formation on aircraft surfaces, an aircraft was equipped with small auxiliary surfaces and aerodynamic shapes similar to struts, wires, Pitot heads, etc. This airplane was flown at an altitude where a temperature of 32 F was encountered, at such times as cloud formations could be found at the coincident altitude. Here it was discovered that ice formed rapidly in regard to quantity, character, shape, and rapidity of formation.
Date: July 1928
Creator: Carroll, Thomas & McAvoy, William H.
Item Type: Refine your search to only Report
open access

The Variation in Pressures in the Cockpit Fan Airplane in Flight

Description: "The results of an investigation to determine the pressures in the open cockpit of a Vought VE-7 airplane are given. The information has been considered valuable on account of its possible effect upon the operation of instruments, particularly altimeters, due to a variation from the true static pressure which is induced by the passage of the airplane through the air. The observed values are small and the effect upon instruments is inconsiderable" (p. 1).
Date: November 1928
Creator: Carroll, Thomas & McAvoy, William H.
Item Type: Refine your search to only Report
open access

Limits of Inflammability of Gases and Vapors

Description: Report issued by the Bureau of Mines over studies conducted on the inflammability of the gases found in mines. As stated in the introduction, "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" (p. 1). This report includes tables, and illustrations.
Date: 1928
Creator: Coward, H. F. & Jones, G. W.
Item Type: Refine your search to only Report
open access

Pressure Distribution Over a Wing and Tail Rib of a VE-7 and of a TS Airplane in Flight

Description: "This investigation was made to determine the pressure distribution over a rib of the wing and over a rib of the horizontal tail surface of an airplane in flight and to obtain information as to the time correlation of the loads occurring on these ribs. Two airplanes, VE-7 and TS, were selected in order to obtain the information for a thin and a thick wing section. In each case the pressure distribution was recorded for the full range of angle of attack in level flight and throughout violent man… more
Date: January 1928
Creator: Crowley, J. W., Jr.
Item Type: Refine your search to only Report
open access

An Investigation of the Aerodynamic Characteristics of an Airplane Equipped with Several Different Sets of Wings

Description: This investigation was conducted by the National Advisory Committee for Aeronautics at Langley Field, Va., at the request of the Army Air Corps, for the purpose of comparing the full scale lift and drag characteristics of an airplane equipped with several sets of wings of commonly used airfoil sections. A Sperry Messenger Airplane with wings of R.A.F.-15, U.S.A.-5, U.S.A.-27, and Gottingen 387 airfoil sections was flown and the lift and drag characteristics of the airplane with each set of wing… more
Date: July 9, 1928
Creator: Crowley, J. W., Jr. & Green, M. W.
Item Type: Refine your search to only Report
Back to Top of Screen