Tests of a gust-alleviating wing in the gust tunnel (open access)

Tests of a gust-alleviating wing in the gust tunnel

"Tests were made in the NACA gust tunnel to determine the effectiveness of a torsionally flexible wing with the torsion axis ahead of the locus of the section aerodynamic centers in reducing airplane accelerations due to atmospheric gusts. For three gust shapes, a series of flights was made with the airplane model equipped with either a torsionally flexible or a rigid wing. The results indicated that the torsionally flexible wing reduced the maximum acceleration increment 5 percent for the sharp-edge gust and about 17 percent for gust shapes with gradient distances of 6.8 and 15 chord lengths" (p. 1).
Date: April 1941
Creator: Shufflebarger, C. C.
Object Type: Report
System: The UNT Digital Library
Some effects of rainfall on flight of airplanes and on instrument indications (open access)

Some effects of rainfall on flight of airplanes and on instrument indications

"Several possible effects of heavy rain on the aerodynamic performance of an airplane and of heavy rain and associated atmospheric phenomena on the indications of flight instruments are briefly considered. It is concluded that the effects of heavy rain on the performance of an airplane are not so great as to force the airplane down from moderate altitudes. Serious malfunctioning of the air-speed indicator may occur, however, as a result of flooding of the pitot-static head and subsequent accumulation of water in the air-speed pressure line" (p. 1).
Date: April 1941
Creator: Rhode, Richard V.
Object Type: Report
System: The UNT Digital Library
Effect of Aging on Mechanical Properties of Aluminum-Alloy Rivets (open access)

Effect of Aging on Mechanical Properties of Aluminum-Alloy Rivets

"Curves and tabular data present the results of strength tests made during and after 2 1/2 years of aging on rivets and rivet wire of 3/16-inch nominal diameter. The specimens were of aluminum alloy: 24S, 17S, and A17S of the duralumin type and 53S of the magnesium-silicide type" (p. 1).
Date: April 1941
Creator: Roop, Frederick C.
Object Type: Report
System: The UNT Digital Library
Aerodynamic Characteristics of a Slot-Lip Aileron and Slotted Flap for Dive Brakes (open access)

Aerodynamic Characteristics of a Slot-Lip Aileron and Slotted Flap for Dive Brakes

From Introduction: "As a part of this investigation, a study is being made of test results obtained during the development of devices designed primarily for other purposes, such as high lift or lateral control, but which may also be used for dive control. These results have been reanalyzed and are herein presented in a form that should make them convenient for design purposes."
Date: April 1941
Creator: Rogallo, F. M.
Object Type: Report
System: The UNT Digital Library
Requirements for Satisfactory Flying Qualities of Airplanes (open access)

Requirements for Satisfactory Flying Qualities of Airplanes

Report presenting flight tests of the flying qualities of numerous airplanes made to provide a fund of quantitative data for correlation with pilots' opinions of controllability, stability, and handling characteristics. A program was instituted which covered the various phases of work required.
Date: April 1941
Creator: Gilruth, R. R.
Object Type: Report
System: The UNT Digital Library
Tail-load measurements on the XB-15 bomber in gusty air (open access)

Tail-load measurements on the XB-15 bomber in gusty air

Report presenting some statistical measurements of the accelerations encountered in gusty air over a period of years in order to determine the loads to which airplanes may be subjected. The statistical measurements have been evaluated to yield either effective or true gust velocities as applied to the wings of airplanes.
Date: April 1941
Creator: Pearson, H. A. & Garvin, J. B.
Object Type: Report
System: The UNT Digital Library
Wind-Tunnel Investigation of a Plain and Slot-Lip Aileron on a Wing With a Full-Span Slotted Flap (open access)

Wind-Tunnel Investigation of a Plain and Slot-Lip Aileron on a Wing With a Full-Span Slotted Flap

Report presenting an investigation of a slot-lip aileron and a plain aileron singly and in combination with an NACA 23012 wing with a full-span slotted flap. Static rolling, yawing, and hinge moments were determined and are presented for several angles of attack and flap deflection.
Date: April 1941
Creator: Rogallo, Francis M. & Spano, Bartholomew S.
Object Type: Report
System: The UNT Digital Library
Preliminary Report on Flight Tests of an Airplane Having Exhaust-Heated Wings (open access)

Preliminary Report on Flight Tests of an Airplane Having Exhaust-Heated Wings

Report presenting testing of an airplane in icing conditions to determine the effect of exhaust heat applied to the wings as a means of preventing ice formations. Other ice-prevention equipment, including an exhaust gas-heated pitot-static head, hot-air-heated windshield, and an inflatable de-icer were also tested.
Date: April 1941
Creator: Rodert, Lewis A.; McAvoy, William H. & Clousing, Lawrence A.
Object Type: Report
System: The UNT Digital Library
The Efficiency of Combustion Turbines With Constant-Pressure Combustion (open access)

The Efficiency of Combustion Turbines With Constant-Pressure Combustion

"Of the two fundamental cycles employed in combustion turbines, namely, the explosion (or constant-volume) cycle and the constant-pressure cycle, the latter is considered more in detail and its efficiency is derived with the aid of the cycle diagrams for the several cases with adiabatic and isothermal compression and expansion strokes and with and without utilization of the exhaust heat. Account is also taken of the separate efficiencies of the turbine and compressor and of the pressure losses and heat transfer in the piping. The results show that without the utilization of the exhaust heat the efficiencies for the two cases of adiabatic and isothermal compression is offset by the increase in the heat supplied" (p. 1).
Date: April 1941
Creator: Piening, Werner
Object Type: Report
System: The UNT Digital Library
Boundary Layer Removal by Suction (open access)

Boundary Layer Removal by Suction

Flight-test data and wind-tunnel data on suction profiles are substantially in agreement. The lift values found in the model test can be actually flown and used as a basis for the design. To visualize the action of the suction, the flow conditions with and without suction on the upper surface were photographed; figures 12 to 15 are sections of the film.
Date: April 1941
Creator: Schrenk, O.
Object Type: Report
System: The UNT Digital Library
Potential Flow Through Centrifugal Pumps and Turbines (open access)

Potential Flow Through Centrifugal Pumps and Turbines

"The methods of conformal transformation up to the present have been applied to the potential flows in the rotation of solid bodies only to a limited extent. This report deals with aspects of centrifugal pumps and turbines such as: the complex potential for rotation, potential for the flow due to the blade rotation, velocities at the blade tip, comparison with "infinite number of blades," and a variable number of blades" (p. 1).
Date: April 1941
Creator: Sörensen, E.
Object Type: Report
System: The UNT Digital Library
Critical Compressive Stress for Outstanding Flanges (open access)

Critical Compressive Stress for Outstanding Flanges

"A chart is presented for the values of the coefficient in the formula for the critical compressive stress at which buckling may be expected to occur in outstanding flanges. These flanges are flat rectangular plates supported along the Loaded edges, supported and elastically restrained along one unloaded edge, and free along the other unloaded edge. The mathematical derivations of the formulas required for the construction of the chart are given" (p. 1).
Date: April 1941
Creator: Lundquist, Eugene E. & Stowell, Elbridge Z.
Object Type: Report
System: The UNT Digital Library
Propeller-Design Problems of High-Speed Airplanes, Special Report (open access)

Propeller-Design Problems of High-Speed Airplanes, Special Report

"It is shown that on the basis of existing high-speed airfoil data, propeller efficiencies appreciably in excess of 40% do not appear possible at speeds above 500 miles per hour at 20,000 feet. The assumption that present propeller-blade thicknesses cannot be reduced radically, is implied. Until the reliability and applicability of the airfoil data are established, this conclusion must not be regarded as infallible. Dive tests with airplanes equipped with thrust meters and torque meters are proposed to provide an urgently needed check" (p. 1).
Date: April 1941
Creator: Dickinson, H. B.
Object Type: Report
System: The UNT Digital Library
Wind-tunnel investigation of the effect of vertical position of the wing on the side flow in the region of the vertical tail (open access)

Wind-tunnel investigation of the effect of vertical position of the wing on the side flow in the region of the vertical tail

Report presenting an investigation of the air flow at the tail of a monoplane model in the 7- by 10-foot wind tunnel to determine the cause of the change in vertical-tail effectiveness with a change in the vertical position of the wing and with flap deflection. Results regarding precision, force-test data, dynamic pressure in the region of the tail, sidewash angle at the tail, and effect of component parts on sidewash angles at the tail are provided.
Date: April 1941
Creator: Recant, Isidore G. & Wallace, Arthur R.
Object Type: Report
System: The UNT Digital Library
Lateral Control Required for Satisfactory Flying Qualities Based on Flight Tests of Numerous Airplanes (open access)

Lateral Control Required for Satisfactory Flying Qualities Based on Flight Tests of Numerous Airplanes

Report presents the results of an analysis made of the aileron control characteristics of numerous airplanes tested in flight by the National Advisory Committee for Aeronautics. By the use of previously developed theory, the observed values of pb/2v for the various wing-aileron arrangements were examined to determine the effective section characteristics of the various aileron types.
Date: April 18, 1941
Creator: Gilruth, R. R. & Turner, W. N.
Object Type: Report
System: The UNT Digital Library
Texas Attorney General Opinion: O-2981 (open access)

Texas Attorney General Opinion: O-2981

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Gerald Mann, regarding a legal question submitted for clarification: Application of Article 326q, Vernon's Annotated Civil Statutes, establishing office of Criminal District Attorney, to Eastland County; and related questions.
Date: April 7, 1941
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-3039 (open access)

Texas Attorney General Opinion: O-3039

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Gerald Mann, regarding a legal question submitted for clarification: (a) Necessity of hearing for suspension of drivers license for conviction in foreign State of driving automobile while intoxicated, failure to stop and render aid, or negligent homicide; (b) Construction, meaning and effect of Sections 9-C, 16, 16-A, and 17, of Texas Driver's License Law. (Art. 6687a, Vernon's Annotated Civil Statutes.)
Date: April 5, 1941
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-3047 (open access)

Texas Attorney General Opinion: O-3047

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Gerald Mann, regarding a legal question submitted for clarification: Power of Commissioners' Court to declare vacancy in office of Justice of the Peace.
Date: April 18, 1941
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-3836 (open access)

Texas Attorney General Opinion: O-3836

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Gerald Mann, regarding a legal question submitted for clarification: Consolidation or annexation of school districts which have bonded indebtedness
Date: April 9, 1941
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-3738A (open access)

Texas Attorney General Opinion: O-3738A

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Gerald Mann, regarding a legal question submitted for clarification: Interpretation of our Opinion No. 0-3738
Date: April 29, 1941
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-3080 (open access)

Texas Attorney General Opinion: O-3080

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Gerald Mann, regarding a legal question submitted for clarification: (a) Whether one drafted into the United States Army vacates this office of Constable; (b) Whether, if a vacancy exists, the commissioners' court may declare the office vacant and appoint a successor.
Date: April 3, 1941
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-3127 (open access)

Texas Attorney General Opinion: O-3127

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Gerald Mann, regarding a legal question submitted for clarification: Whether under circumstances set forth County Treasury should refund to the county amount deducted by the Treasurer as part of the premium paid on surety bonds. Other related questions.
Date: April 10, 1941
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-3144 (open access)

Texas Attorney General Opinion: O-3144

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Gerald Mann, regarding a legal question submitted for clarification: When does the additional salary provided by Article 5139, Revised Civil Statutes of Texas, 1925, for District Judges in counties having a population of 100,000 or over, according to the 1940 Federal Census, begin to assume?
Date: April 9, 1941
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-3464 (open access)

Texas Attorney General Opinion: O-3464

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Gerald Mann, regarding a legal question submitted for clarification: Matter of the authority of the State Board of Public Welfare to destroy the records, reports, etc. as scrap paper formerly constituting the archives of the Texas Relief Commission.
Date: April 29, 1941
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History