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July 16th nuclear explosion: Permanent earth displacement

Description: A measurement was made of the permanent earth movement in the neighborhood of the tower caused by the nuclear explosion at Trinity. The crater was apparently formed by a compression phenomenon and was noted to be much shallower than craters formed by ordinary high explosives. Scaling up existing information on the radius of craters, the TNT equivalence of the nuclear bomb is given as 10,000 tons to within 50 percent. Observations were made on the damage in the crater region and suggestions are given as to the nature of structure which might be expected to withstand the blast close to the gadget. It is also noted that, despite previous opinion to the contrary, it is apparently possible to reduce greatly the volume of earth blown away by the blast by suitably protecting the ground.
Date: October 3, 1945
Creator: Reines, F.
Partner: UNT Libraries Government Documents Department

Preliminary Investigation of Effects of Alpha-Particle Bombardment on the Creep Rate of Aluminum

Description: Memorandum presenting a preliminary investigation to determine the effects of alpha-particle bombardment on the creep rate of aluminum wire at 400 degrees Fahrenheit. The alpha radiation from an 85-millicurie polonium source appeared to decrease slightly the creep rate of the aluminum.
Date: July 3, 1947
Creator: Kittel, J. Howard
Partner: UNT Libraries Government Documents Department

Preliminary Correlation of the Effect of Compressibility on the Location of the Section Aerodynamic Center at Subcritical Speeds

Description: Memorandum presenting a correlation of available two-dimensional airfoil data to determine the effects of compressibility on the location of the section aerodynamic center at low lift coefficients. The results indicate that large forward or rearward movements of the aerodynamic center with Mach number are possible.
Date: November 3, 1948
Creator: Polhamus, Edward C.
Partner: UNT Libraries Government Documents Department

Computed Performance of a Composite Engine Based on Experimental Data for a Single-Cylinder Conventional Aircraft Engine Converted to Compression-Ignition Operation

Description: Memorandum presenting a determination of the performance of a single-cylinder spark-ignition engine modified to operate on a compression-ignition cycle with a compression ratio of 8.0. Experimental data were obtained at an inlet-manifold pressure of 100 inches of mercury absolute, fuel-air ratios of 0.040 and 0.025, and engine exhaust pressures of 30 to 100 inches of mercury absolute. Results regarding single-cylinder-engine experimental data and full-scale-engine calculations are provided.
Date: February 3, 1947
Creator: McCoy, J. Arnold & Szel, Frank
Partner: UNT Libraries Government Documents Department

Knock-limited power outputs from a CFR engine using internal coolants 3: four alkyl amines, three alkanolamines six amides, and eight heterocyclic compounds

Description: Report presenting investigations to determine the antiknock effectiveness of various additive-water solutions used as internal coolants in conjunction with AN-F-28, Amendment-2, fuel in a modified CFR engine.
Date: February 3, 1947
Creator: Imming, Harry S. & Bellman, Donald R.
Partner: UNT Libraries Government Documents Department

Aerodynamic characteristics at subsonic and supersonic Mach numbers of a thin triangular wing of aspect ratio 2 2: maximum thickness at midchord

Description: "The lift, drag, and pitching-moment characteristics of a triangular wing, having an aspect ratio of 2 and a symmetrical double-wedge profile of 5-percent-chord maximum thickness at midchord, have been evaluated from wind-tunnel tests at Mach numbers from 0.50 to 0.975 and from 1.09 to 1.49 and at Reynolds numbers ranging from 0.67 to 0.85 million. The lift, drag, and pitching-moment coefficients of the triangular wing with a leading-edge sweepback of approximately 63 degrees did not exhibit the irregular variations with Mach number at high subsonic and low supersonic Mach numbers that are characteristic of unswept wings. The lift-curve slope increased steadily with Mach number below unity and declined slowly beyond the Mach number of 1.13" (p. 1).
Date: December 3, 1948
Creator: Walker, Harold J. & Berggren, Robert E.
Partner: UNT Libraries Government Documents Department

Preliminary Evaluation of the Spin and Recovery Characteristics of the Douglas XF3D-1 Airplane

Description: "A preliminary evaluation of the spin and recovery characteristics of the XF3D-1 airplane has been made, based primarily on the results of the free-spinning tunnel tests of a model which closely simulated the XF3D-1 in tail design, tail length, and mass loading. Estimates have been made of the rudder-pedal force that may be encountered in effecting recovery from a spin and of the spin recovery parachute requirements of the airplane for demonstration spins. The method of bail-out which should be used if it becomes necessary for the crew to abandon the airplane during a spin is indicated" (p. 1).
Date: July 3, 1947
Creator: Scher, Stanley H.
Partner: UNT Libraries Government Documents Department

A flight investigation and analysis of the lateral-oscillation characteristics of an airplane

Description: Report presenting flight tests to determine the causes of undesirable dynamic lateral-stability characteristics of an airplane. Various rudder modifications were flight tested with the rudder free and fixed over an indicated airspeed range from approximately 200 to 450 miles per hour. Results regarding rudder-fixed characteristics and rudder-free characteristics are provided.
Date: June 3, 1948
Creator: Stough, Carl J. & Kauffman, William M.
Partner: UNT Libraries Government Documents Department

The effect of air-jet and strip modifications on the hydrodynamic characteristics of the streamline fuselage of a transonic airplane

Description: Report presenting 1/12-size model of a streamline fuselage modified by patterns of air jets or strips on the fuselage bottom. The effects of spacing of jets, length of jet rows, and direction of jets were determined for a simulated chine configuration. Data are presented on resistance, trim, effective hydrodynamic lift, and spray.
Date: June 3, 1949
Creator: Weinflash, Bernard; Christopher, Kenneth W. & Shuford, Charles L., Jr.
Partner: UNT Libraries Government Documents Department

Experimental investigation of the effects of viscosity on the drag of bodies of revolution at a Mach number 1.5

Description: Report presenting testing to determine the effects of viscosity on the drag and base pressure characteristics of various bodies of revolution at a Mach number of 1.5. The models were tested with smooth surfaces and roughness to evaluate the effects of Reynolds number for both laminar and turbulent boundary layers. Results regarding the reduction of data, precision, effects of support interference, Schileren photographs, and theoretical calculations are provided.
Date: April 3, 1947
Creator: Chapman, Dean R. & Perkins, Edward W.
Partner: UNT Libraries Government Documents Department

Vibration of loosely mounted turbine blades during service operation of a turbojet engine with centrifugal compressor and straight-flow combustion chambers

Description: Report presenting an experimental investigation to determine the vibration characteristics of loosely mounted turbine blades during service operation of a turbojet engine. High-temperature strain gages were used to measure turbine-blade vibrations. Results regarding oscillograph records, critical speeds and frequencies, vibratory-stress levels, and effect of tightening the blade mount are provided.
Date: November 3, 1949
Creator: Morgan, W. C.; Kemp, R. H. & Manson, S. S.
Partner: UNT Libraries Government Documents Department

Carbon deposition of 19 fuels in an annular turbojet combustor

Description: Report presenting the effects of fuel properties and change in simulated engine operating conditions on carbon deposition in an annular turbojet combustor. The fuel properties examined included specific gravity, volumetric average boiling temperature, hydrocarbon type, and hydrogen-carbon weight ratio. The fuels included hydrocarbons of the paraffinic, olefinic, and aromatic types as well as fuel mixtures.
Date: February 3, 1949
Creator: Wear, Jerrold D. & Jonash, Edmund R.
Partner: UNT Libraries Government Documents Department

Analytical determination of effect of water injection on power output of turbine-propeller engine

Description: From Introduction: "Water injection at the compressor inlet has been successfully used to increase the thrust of turbojet engines. References 1 and 2 indicate that the sea-level static thrust of a centrifugal-flow-type turbojet engine may be increased about 25 percent by use of liquid injection. Reference 3 indicates that greater thrust augmentation is possible at a compressor pressure ratio of 11 than of 4."
Date: November 3, 1949
Creator: Ross, Albert O. & Huppert, Merle C.
Partner: UNT Libraries Government Documents Department

Investigation of interaction effects arising from side-wall boundary layers in supersonic wind-tunnel tests of airfoils

Description: Report presenting an investigation to determine the cause for a discrepancy between theoretical and experimental pressure distributions found during a two-dimensional investigation of flapped airfoils in a 2- by 8-inch supersonic tunnel. The results indicated that a tunnel-boundary-layer and model-flow interaction effect on the flow over models mounted directly from the walls in supersonic wind tunnels exists.
Date: November 3, 1948
Creator: Czarnecki, K. R. & Schueller, C. F.
Partner: UNT Libraries Government Documents Department

Newsmap for the Armed Forces : Yanks land on Japan

Description: Front: Text describes American occupation of Japan beginning 28 August, 1945 and is keyed to map. Map shows eastern central coast of Japan. Inset shows map of Japan. Back: Armed forces radio. Text describes stations and programs. World maps shows locations of AFRS stations, AFRS hospital systems in the U.S., commercial and government stations airing AFRS programs.
Date: September 3, 1945
Creator: [United States.] Army Service Forces. Army Information Branch.
Partner: UNT Libraries Government Documents Department

Newsmap. For the Armed Forces. 251st week of the war, 133rd week of U.S. participation

Description: Front: Text describes action on various war fronts: France, Eastern front, Italy, Air war, Southeast Asia, China, Saipan, Pacific, Southwest Pacific. Maps: Finland, North Burma, France, Eastern front. Back: Text and color illustrations explain the importance of teamwork, preparation, and support in combined or amphibious operations.
Date: July 3, 1944
Creator: [United States.] Army Service Forces. Army Information Branch.
Partner: UNT Libraries Government Documents Department

Newsmap. Monday, May 3, 1943 : week of April 23 to April 30, 190th week of the war, 72nd week of U.S. participation

Description: Front: Text describes action on various war fronts: Tunisia, Command, Air offensive, Russia, Southwest Pacific, Aleutians. Large world map shows the United Nations, Axis and Axis occupied areas, countries with Axis relations broken, and neutral countries. Inset maps show military activities across the globe during the week; Battle of Tunisia. Photographs: American infantrymen advance towards Gabes; Army's M-12 155mm gun; Bristol Beaufighters enroute to Wau. Back:Don't [help the enemy by making military information easy to get].
Date: May 3, 1943
Creator: [United States.] Army Orientation Course.
Partner: UNT Libraries Government Documents Department

Newsmap. Monday, January 3, 1944 : week of December 22 to December 29, 1943, 225th week of the war, 107th week of U.S. participation

Description: Front: Text describes action on various war fronts: New Britain, Air offensive, USSR, Italy, Scharnhorst, Command. Maps: Central Italy showing rivers and roads, Distance from London to the coast of France near Boulogne, Coastline of northern Scandinavia. Photographs: American 155mm gun fires on German positions at Mignano; American soldiers temporarily reside in holes on Venafro Ridge; Equipment retreating Germans used to tear up railroad tracks; Allied troops clear the torn up tracks to use the road bed as a highway; An LST lands at Mono Island. Back: Color map of northeast New Guinea/New Britain.
Date: January 3, 1944
Creator: [United States.] Army Orientation Course.
Partner: UNT Libraries Government Documents Department