Concluding Report of Free-Spinning, Tumbling, and Recovery Characteristics of a 1/18-Scale Model of the Ryan X-13 Airplane, Coord. No. AF-199 (open access)

Concluding Report of Free-Spinning, Tumbling, and Recovery Characteristics of a 1/18-Scale Model of the Ryan X-13 Airplane, Coord. No. AF-199

"An investigation has been completed in the Langley 20-foot free-spinning tunnel on a l/18-scale model of the Ryan X-13 airplane to determine its spin, recovery, and tumbling characteristics, and to determine the minimum altitude from which a belly landing could be made in case of power failure in hovering flight. Model spin tests were conducted with and without simulated engine rotation. Tests without simulated engine rotation indicated two types of spins: one, a slightly oscillatory flat spin; and the other, a violently oscillatory spin" (p. 1).
Date: May 17, 1957
Creator: Bowman, James S., Jr.
Object Type: Report
System: The UNT Digital Library
Full-scale wind-tunnel tests of the longitudinal stability and control characteristics of the XV-1 convertiplane in the autorotating flight range (open access)

Full-scale wind-tunnel tests of the longitudinal stability and control characteristics of the XV-1 convertiplane in the autorotating flight range

Force and moments were measured for the XV-1 convertiplane at 75 to 150 knots. Rotor on and off and propeller powered and off configurations were investigated. The characteristics of the V-tab horizontal tail and its downwash field were studied. Lift interference between fixed wing and rotor and possible means of drag reduction were considered.
Date: May 17, 1956
Creator: Hickey, David H.
Object Type: Report
System: The UNT Digital Library
Investigation of the possibility of simplifying missile guidance systems by the use of free-floating flaps and spring-mounted control surfaces (open access)

Investigation of the possibility of simplifying missile guidance systems by the use of free-floating flaps and spring-mounted control surfaces

Report presenting an investigation of the use of aerodynamic and mechanical devices for improving the response of guided missiles. An analysis indicates that the use of free-floating flaps and spring-mounted control surfaces should be able to increase maneuverability to the point that electronic automatic stabilization and gain-adjusting devices can be eliminated.
Date: May 17, 1956
Creator: Hikido, Katsumi; Hayashi, Paul H. & Lessing, Henry C.
Object Type: Report
System: The UNT Digital Library
A Method of Reducing Heat Transfer to Blunt Bodies by Air Injection (open access)

A Method of Reducing Heat Transfer to Blunt Bodies by Air Injection

Report presenting investigations of the effect of air injection at the stagnation point on the heat-transfer characteristics of a hemisphere in a supersonic stream. Results regarding air injection directly into the stream and air injection tangent to surface are provided.
Date: May 17, 1956
Creator: Stalder, Jackson R. & Inouye, Mamoru
Object Type: Report
System: The UNT Digital Library
Some Notes on the Violent Lateral-Longitudinal Coupling Motions of the Douglas X-3 Airplane in Aileron Rolls (open access)

Some Notes on the Violent Lateral-Longitudinal Coupling Motions of the Douglas X-3 Airplane in Aileron Rolls

Report presenting a study of the potentially large violent coupled motions encountered by the Douglas X-3 in flight. Testing indicated that the motions encountered appeared to be caused by the inclination of the principal axis below the flight path at the onset of rolling maneuvers and the existence of pitching moment due to side slip combined with a trim change near Mach number 1. Results regarding the effect of principal-axis inclination, effect of changes in directional stability, effect of pitching moment due to sideslip, effect of trim changes, and effect of roll direction are provided.
Date: May 17, 1956
Creator: Stone, Ralph W., Jr.
Object Type: Report
System: The UNT Digital Library
Transonic wind-tunnel measurements of static lateral and directional stability and vertical-tail loads for a model with a 45 degree sweptback wing (open access)

Transonic wind-tunnel measurements of static lateral and directional stability and vertical-tail loads for a model with a 45 degree sweptback wing

Report presenting an investigation to determine the vertical-tail loads and airplane characteristics in sideslip for a model of a swept-wing fighter-type airplane in the 16-foot transonic tunnel at a range of Mach numbers and angles of attack. Results regarding the effect of the unsealed vertical-tail root on airplane coefficients, directional and lateral stability, vertical-tail loads, effect of leading-edge chord-extensions on lateral and directional characteristics and on tail loads, and pitching moments in sideslip are provided.
Date: May 17, 1956
Creator: Hallissy, Joseph M., Jr.
Object Type: Report
System: The UNT Digital Library

Photogeologic map of the Kaiparowits Peak-1 quadrangle, Garfield County, Utah

Photogeologic map of the Kaiparowits Peak-1 quadrangle, Garfield County, Utah
Date: May 17, 1955
Creator: Detterman, Janis S.
Object Type: Map
System: The UNT Digital Library
{{{title}}} metadc1254011 (open access)

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The absorption of the important fission products by plants is quantitatively presented as a concentration factor which is defined as the ratio of the fission product concentration found in the leaves to the fission product concentration found in the nutrient substrate. Of the fission products, the isotopes of strontium were found to be the most important by virtue of their high concentration factor, long half-life, and low maximum permissible amounts for animals. Iodine and barium follow in importance, with cesium moderately important in some soils. All other fission products have concentration factors less than strontium by 100 or more. The effect on the concentration factor of different agricultural plants, as well as different organs of the same plant, causes variations of about a factor of ten or less for each isotope. The concentration factor tends to increase as the pH of the nutrient substrate is decreased. Addition of stable carrier to the substrate does not decrease the amount of the radioactive isotope that is absorbed into the plant. The presence of iodine and yttrium carrier actually causes a significant increase in the concentration of the respective radioactive isotopes in the plant tissue.
Date: May 17, 1955
Creator: Rediske, J. H.; Cline, J. F. & Selders, A. A.
Object Type: Report
System: The UNT Digital Library
Analysis of experimental sea-level transient data and analog method of obtaining altitude response for turbine-propeller engine with relay-type speed control (open access)

Analysis of experimental sea-level transient data and analog method of obtaining altitude response for turbine-propeller engine with relay-type speed control

From Introduction: "This report shows correlation between actual transient data obtained from the engine and solutions to a simulated system set up on an analog computer. Data are presented for response of engine speed to changes in set speed when the power plant was being controlled by a relay-type electronic governor that acted to maintain set speed by varying propeller pitch. Correlation obtained for sea-level conditions between actual time data and analog solutions is discussed."
Date: May 17, 1951
Creator: Vasu, George & Pack, George J.
Object Type: Report
System: The UNT Digital Library
A semi-empirical method for calculating the pitching moment of bodies of revolution at low Mach numbers (open access)

A semi-empirical method for calculating the pitching moment of bodies of revolution at low Mach numbers

A semiempirical method, in which potential theory is arbitrarily combined with an approximate viscous theory, for calculating the aerodynamic pitching moments for bodies of revolution is presented. The method can also be used for calculating the lift and drag forces. The calculated and experimental force and moment characteristics of 15 bodies of revolution are compared.
Date: May 17, 1951
Creator: Hopkins, Edward J.
Object Type: Report
System: The UNT Digital Library
Refractive Index Measurements (open access)

Refractive Index Measurements

Report summarizing physical studies on Redox solutions and metal waste solutions, including refractometric investigations.
Date: May 17, 1950
Creator: Burger, L. L.
Object Type: Report
System: The UNT Digital Library
Operation of the 184" Cyclotron (open access)

Operation of the 184" Cyclotron

The operation of the 184" synchro-cyclotron is reviewed in terms of the theory as developed by the authors. Certain relevant data on the properties of the magnet and rotating condenser are also presented.
Date: May 17, 1949
Creator: Henrich, L. R.; Sewell, D. C. & Vale, J.
Object Type: Report
System: The UNT Digital Library
Free-Flight Investigation of the Rolling Effectiveness of a Wing-Spoiler Arrangement at High Subsonic, Transonic, and Supersonic Speeds (open access)

Free-Flight Investigation of the Rolling Effectiveness of a Wing-Spoiler Arrangement at High Subsonic, Transonic, and Supersonic Speeds

Report presenting an investigation of the rolling effectiveness of a wing-spoiler arrangement using a rocket-propelled test vehicle in free flight. The configuration investigated in the report is likely not optimum and indicates a need for further exploration.
Date: May 17, 1948
Creator: Sandahl, Carl A.
Object Type: Report
System: The UNT Digital Library
Free-Spinning-Tunnel Tests of a 1/24-Scale Model of the North American XP-86 Airplane (open access)

Free-Spinning-Tunnel Tests of a 1/24-Scale Model of the North American XP-86 Airplane

"A spin investigation has been conducted in the Langley 20-foot free-spinning tunnel on a 1/24-scale model of the North American XP-86 airplane. The effects of control settings and movements upon the erect and inverted spin and recovery characteristics of the model were determined for the design gross weight loading. The long-range loading was also investigated and the effects of extending slats and dive flaps were determined" (p. 1).
Date: May 17, 1948
Creator: Berman, Theodore
Object Type: Report
System: The UNT Digital Library
Performance of 24-Inch Supersonic Axial-Flow Compressor in Air 1: Performance of Compressor Rotor at Design Tip Speed of 1600 Feet Per Second (open access)

Performance of 24-Inch Supersonic Axial-Flow Compressor in Air 1: Performance of Compressor Rotor at Design Tip Speed of 1600 Feet Per Second

Memorandum presenting an investigation of an axial-flow compressor rotor operating with supersonic velocities relative to the blade rows in order to determine the performance characteristics in air and to confirm the performance obtained in Freon-12 at another laboratory. Results regarding the weight flow, work of compression, pressure ratio and adiabatic efficiency, and entry of shock are provided.
Date: May 17, 1948
Creator: Ritter, William K. & Johnsen, Irving A.
Object Type: Report
System: The UNT Digital Library
Qualitative Measurements of Relative Flap Effectiveness at Transonic Speeds on a Series of Five Thin Airfoils With 25-Percent-Chord Flaps and Various Amounts of Sweepback (open access)

Qualitative Measurements of Relative Flap Effectiveness at Transonic Speeds on a Series of Five Thin Airfoils With 25-Percent-Chord Flaps and Various Amounts of Sweepback

Report presenting testing on a series of five flat plate models of aspect ratio 2.0 with 25-percent-mean-aerodynamic-chord flaps at a range of Mach numbers in order to investigate the effect of sweepback on flap effectiveness.
Date: May 17, 1948
Creator: Crane, Harold L. & McLaughlin, Milton D.
Object Type: Report
System: The UNT Digital Library
The Biologic Effects of Radiation ; Training Program Lecture Notes (open access)

The Biologic Effects of Radiation ; Training Program Lecture Notes

The following report provides data taken from investigations on radiation and the different biologic effects on it.
Date: May 17, 1943
Creator: Cantril, Simeon T.
Object Type: Report
System: The UNT Digital Library