The 5- by 7-meter wind tunnel of the DVL (open access)

The 5- by 7-meter wind tunnel of the DVL

The report contains a description of the DVL wind tunnel. According to the cones fixed, an elliptical stream with axes 5 by 7 meters and length 9 meters, or a stream 6 by 8 meters in cross section and 11 meters in length is available. The top speed with the smaller cone is 65 meters per second. The testing equipment consists of an automatic six-component balance and a test rig for propellers and engines up to 650 horsepower.
Date: March 1936
Creator: Kramer, M.
Object Type: Report
System: The UNT Digital Library
The 6-Foot-4-Inch Wind Tunnel at the Washington Navy Yard (open access)

The 6-Foot-4-Inch Wind Tunnel at the Washington Navy Yard

Report discussing the 6-foot-4-inch wind tunnel and its auxiliary equipment has proven itself capable of continuous and reliable output of data. The real value of the tunnel will increase as experience is gained in checking the observed tunnel performance against full-scale performance. Such has been the case of the 8- by 8-foot tunnel, and for that reason the comparison in the calibration tests have been presented.
Date: August 1935
Creator: Desmond, G. L. & McCrary, J. A.
Object Type: Report
System: The UNT Digital Library
The 7 by 10 Foot Wind Tunnel of the National Advisory Committee for Aeronautics (open access)

The 7 by 10 Foot Wind Tunnel of the National Advisory Committee for Aeronautics

This report presents a description of the 7 by 10 foot wind tunnel and associated apparatus of the National Advisory Committee for Aeronautics. Included also are calibration test results and characteristic test data of both static force tests and autorotation tests made in the tunnel.
Date: October 22, 1931
Creator: Harris, Thomas A.
Object Type: Report
System: The UNT Digital Library
The 1929 Rhon soaring-flight contest (open access)

The 1929 Rhon soaring-flight contest

The limitation of the 1929 contest to performance gliders necessitated the establishment of a formula which would make it possible to distinguish between performance gliders and school and training gliders. The sinking speed was therefore adopted as the basis for such a distinction, and the requirement was made that the sinking speed of a performance glider should not exceed 0.8 m/s. The rest of the report details the different entries with regard to design and performance.
Date: April 1930
Creator: Lippisch, Alexander
Object Type: Report
System: The UNT Digital Library
The 1933 Contest for the Deutsch De La Meurthe Trophy (open access)

The 1933 Contest for the Deutsch De La Meurthe Trophy

Report discussing the regulations and airplanes participating in the 1933 contest competing for the Deutsch de la Meurthe trophy.
Date: October 1933
Creator: Léglise, Pierre; Hirschauer, L. & Saladin, Raymond
Object Type: Report
System: The UNT Digital Library
The 1934 Contest for the Deutsch De La Meurthe Trophy (open access)

The 1934 Contest for the Deutsch De La Meurthe Trophy

This report presents a description of the rules, history and new technical innovations in the Deutsch de la Meurthe Cup race of 1934.
Date: February 1935
Creator: Léglise, Pierre
Object Type: Report
System: The UNT Digital Library
N.A.C.A. Stall-Warning Device (open access)

N.A.C.A. Stall-Warning Device

With some airplanes the approach to the stall is accompanied by changes in the behavior, such as tail buffeting or changes in the control characteristics of the airplane so that the pilot obtains a warning of the impending stall. Vith other airplanes it is possible to approach the stall without any perceptible warning other than the reading of the air-speed meter, in which case the danger of inadvertent stalling is considerably greater. Although it is not within the scope of this paper to discuss stalling characteristics, it is desired to point out that in general the danger of inadvertent stalling is greatest with those airplanes that behave worse when the stalling occurs; that is, with airplanes in which the stall starts at the wing tips. A warning of the impending stall is desirable in any case, but is particularly desirable with airplanes of the latter type.
Date: February 1938
Creator: Thompson, F. L.
Object Type: Report
System: The UNT Digital Library
N.A.C.A. Stall-Warning Indicator (open access)

N.A.C.A. Stall-Warning Indicator

"The stall-warning indicator employs a total-head tube located close to the wing surface in a region wherein local stalling occurs before the main portion of the wing stalls. The artificial production of a localized stalled region is accomplished by means of a sharp leading edge extending a few inches along the span. An abrupt drop in the total pressure relative to a static reference taken at some convenient point occurs at the stall in this region" (p. 1).
Date: October 1938
Creator: Thompson, F. L.
Object Type: Report
System: The UNT Digital Library
The Aachen Wind-Tunnel Balance (open access)

The Aachen Wind-Tunnel Balance

Report discussing a description of the balance in the Aachen wind-tunnel.
Date: November 1934
Creator: Wieselsberger, C.
Object Type: Report
System: The UNT Digital Library

Abilene Sheet

Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:125000
Date: 1937
Creator: Geological Survey (U.S.)
Object Type: Map
System: The Portal to Texas History
Accelerated Laboratory Test for Determination of Slacking Characteristics of Coal (open access)

Accelerated Laboratory Test for Determination of Slacking Characteristics of Coal

Report issued by the U.S. Bureau of Mines on laboratory testing developed to measure the slacking of coals. Testing methods and results are presented. This report includes tables and graphs.
Date: November 1930
Creator: Fieldner, Arno Carl; Selvig, W. A. & Frederic, W. H.
Object Type: Report
System: The UNT Digital Library
Acceleration, Stress, and Deflection Measurements on the XB-15 Bomber in Gusty Air (open access)

Acceleration, Stress, and Deflection Measurements on the XB-15 Bomber in Gusty Air

From Introduction: "This report presents the results of these tests which cover a total of about 70 flying hours on this airplane."
Date: June 1939
Creator: Pearson, Henry A.
Object Type: Report
System: The UNT Digital Library
Accelerations in Landing with a Tricycle-Type Landing Gear (open access)

Accelerations in Landing with a Tricycle-Type Landing Gear

"In connection with the application of stable tricycle-type landing gears to transport airplanes, the question arises as to whether certain passengers may not experience relatively great accelerations in an emergency landing. Since the main landing wheels are behind the center of gravity in this type of gear, a hard-braked landing will cause immediate nosing down of the airplane and, when this motion is stopped due to the front wheel striking the ground, there will be some tendency for the rearmost passengers to be thrown out of their seats, The provided rough calculations are designed to show the magnitudes of the various reactions experienced in a severe landing under these circumstances" (p. 1).
Date: February 1937
Creator: Jones, Robert T.
Object Type: Report
System: The UNT Digital Library
Accident Experience and Cost of Accidents in Washington Coal Mines (open access)

Accident Experience and Cost of Accidents in Washington Coal Mines

Report containing tables detailing cost of mining accidents in Washington state in comparison with other states.
Date: November 1931
Creator: Ash, S. H.
Object Type: Report
System: The UNT Digital Library
Accounting System and Office-Management Procedure for Medium-Size Metal Mines (open access)

Accounting System and Office-Management Procedure for Medium-Size Metal Mines

Report discussing an accounting system and management of office procedures design for medium-size metal mines, offered by the United States Bureau of Mines, to be more efficient in the mining industry.
Date: 1934
Creator: Keller, Albert E.
Object Type: Report
System: The UNT Digital Library
Accurate Calculation of Multispar Cantilever and Semicantilever Wings With Parallel Webs Under Direct and Indirect Loading (open access)

Accurate Calculation of Multispar Cantilever and Semicantilever Wings With Parallel Webs Under Direct and Indirect Loading

In the present report the computation is actually carried through for the case of parallel spars of equal resistance in bending without direct loading, including plotting of the influence lines; for other cases the method of calculation is explained. The development of large size airplanes can be speeded up by accurate methods of calculation such as this.
Date: March 1932
Creator: Sänger, Eugen
Object Type: Report
System: The UNT Digital Library
An Accurate Method of Measuring the Moments of Inertia of Airplanes (open access)

An Accurate Method of Measuring the Moments of Inertia of Airplanes

From Summary: "This note contains a description of an improved apparatus and procedure used by the NACA for determining the moments of inertia of airplanes. The method used, based on the pendulum theory, is similar to that previously used, but a recent investigation of its accuracy has resulted in the improvements described herein. The error, when using the new apparatus and procedure, has been found to be of the order of 1 per cent."
Date: October 1930
Creator: Miller, M. P.
Object Type: Report
System: The UNT Digital Library
Activation of hydrocarbons and the octane number (open access)

Activation of hydrocarbons and the octane number

This report presents an examination of the history of research on engine knocking and the various types of fuels used in the investigations of this phenomenon. According to this report, the spontaneous ignition of hydrocarbons doped with oxygen follows the logarithmic law within a certain temperature range, but not above 920 degrees K. Having extended the scope of investigations to prove hydrocarbons, the curves of the mixtures burned by air should then be established by progressive replacement of pure iso-octane with heptane. Pentane was also examined in this report.
Date: October 1939
Creator: Peschard, Marcel
Object Type: Report
System: The UNT Digital Library

Addington Sheet

Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:125000
Date: 1937
Creator: Geological Survey (U.S.)
Object Type: Map
System: The Portal to Texas History
Additional Test Data on Static Longitudinal Stability (open access)

Additional Test Data on Static Longitudinal Stability

From Summary: "The purpose of this investigation was to explore the influence of weights of the controls on the stability with elevator released. The available test data were extended to stability with elevator locked. In this connection the study of the propeller effect seemed of vital importance."
Date: August 1934
Creator: Hübner, Walter
Object Type: Report
System: The UNT Digital Library
Adhesion of Ice in Its Relation to the De-Icing of Airplanes (open access)

Adhesion of Ice in Its Relation to the De-Icing of Airplanes

From Summary: "The various possible means of preventing ice adhesion on airplane surfaces are critically reviewed. Results are presented of tests of the adhesives forces between ice and various solid and liquid forces. It is concluded that the de-icing of airplane wings by heat from engine exhaust shows sufficient promise to warrant full-scale tests. For propellers, at least, and possibly for certain small areas such as windshields, radio masts, etc. the use of de-icing or adhesion-preventing liquids will provide the best means of protection."
Date: August 1939
Creator: Rothrick, A. M. & Selden, R. F.
Object Type: Report
System: The UNT Digital Library
Adjusting Corn Belt Farming to Meet Corn-Borer Conditions (open access)

Adjusting Corn Belt Farming to Meet Corn-Borer Conditions

"The European corn borer is recognized as a dangerous enemy of the corn crop.... Its eradication is considered economically impossible but it is believed that the injury may be kept at a point so low that little commercial damage will occur during normal seasons. This can be done by using control measures and practices that have proved to be effective.... On some farms some changes in the crops grown and in their sequence will aid materially in controlling the borer and may prove profitable even when borers are not present. The control program for the individual farm should be given consideration at once in order to avoid sudden disturbance of the organization and operation of the farm when control measures do become inevitable. The necessity of concerted effort by all producers in an infested district becomes evident when the life habits of the borer are considered." -- p. ii
Date: 1932
Creator: Myres, Kenneth Hayes, 1898-
Object Type: Pamphlet
System: The UNT Digital Library
Advantages of Oxide Films as Bases for Aluminum Pigmented Surface Coatings for Aluminum Alloys (open access)

Advantages of Oxide Films as Bases for Aluminum Pigmented Surface Coatings for Aluminum Alloys

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.
Object Type: Report
System: The UNT Digital Library

Ady Quadrangle

Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:62500
Date: 1936
Creator: Geological Survey (U.S.)
Object Type: Map
System: The Portal to Texas History