UNT Libraries Government Documents Department - 37 Matching Results
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- Air-flow surveys in the region of the tail surfaces of a single-engine airplane equipped with dual-rotating propellers
- From Summary: "Surveys of the air flow in the region of the tail surfaces of a single-engine pursuit-type airplane equipped with dual-rotating propellers are presented."
- Circumventing chloride ion trouble Columbia River water
- This report contains data acquired during sampling of the Columbia River water on March 26, 1945. Topics of discussion include; the elevation of chlorine levels from 4 ppm to 20 ppm, what steps should be taken to remediate the problem, and the various processes that were taken into consideration for the clean up of this chlorine. Separation processes considered include; ion exchange, distillation, precipitation, heat exchange, and recirculation through a cooling tower.
- Comparative Yields of Light Oil, Tar, and Constituents from Carbonization Tests at 800 Degrees, 900 Degrees, and 1,000 Degrees Celsius
- Report issued by the U.S. Bureau of Mines on testing done on a variety of American coals collected from 32 coal beds across the country. The carbonizing properties of samples tested at 3 different temperatures are presented. This report includes tables, and graphs.
- A Correlation of the Dimensions, Proportions, and Loadings of Existing Seaplane Floats and Flying Boat Hulls
- Report presenting a study to determine what loadings and proportions have been chosen by designers of seaplanes and flying boats and what, if any, interrelations exist between the loadings and proportions. The characteristics considered include the beam, getaway speed, forebody length, afterbody length, hull length, center of gravity, and brake horsepower necessary.
- Critical amounts of uranium compounds
- No Description Available.
- DECONTAMINATION OF PRODUCT BY ADSORPTION ON TAILOR-MADE INORGANIC ADSORBENTS
- No Description Available.
- Determination of Flight Paths of an SBD-1 Airplane in Simulated Diving Attacks, Special Report
- An investigation has been made to determine the motions of and the flight paths describe by a Navy dive-bombing airplane in simulated diving attacks. The data necessary to evaluate these items, with the exception of the atmospheric wind data, were obtained from automatic recording instruments installed entirely within the airplane. The atmospheric wind data were obtained from the ground by the balloon-theodolite method. The results of typical dives at various dive angles are presented in the form of time histories of the motion of the airplane as well as flight paths calculated with respect to still air and with respect to the ground.
- The effect of altitude on cooling
- Report presenting variables that control the cooling of liquid-cooled and air-cooled engines and then to show by illustrations how either engine may be cooled at any desired altitude. Cooling was found to not be the limiting factor in the design of high-altitude airplanes and was also not found to be a valid reason for selecting either liquid- or air-cooled engines for high-altitude operation.
- Effect of Carburetor-Mixture-Control and Supercharger Characteristics on Fuel Knock Under Simulated Sea-Level Flight Conditions
- Report presenting knock-limit data recorded for a current 100-octane-number aviation gasoline in a full-scale single-cylinder test engine. Inlet-air temperatures were the temperatures estimated from a consideration of the temperature increase through an aircraft-engine supercharger. The data indicate that the relation of the carburetor-mixture-control characteristics to the knock characteristics of the fuel is an important factor in determining knock-free operation.
- The Effect of Spinner-Body Gap on the Pressures Available for Cooling in the NACA E-Type Cowling
- "Tests of a 1/3-scale model of an NACA E-type cowling were made in the 8-foot high-speed tunnel for the purpose of determining the effect of the gap between the skirt of the hollow spinner and the cowling proper on the pressures available for cooling. It was found that even a large gap (0.096 in. on the model) had no appreciable effect on the available cooling pressures" (p. 1).
- Effects of Prior Fatigue-Stressing of the Impact Resistance of Chromium-Molybdenum Aircraft Steel
- Note presenting a study of the impact behavior of normalized SAE X4130 steel after a variety of repeated stress treatments. Fatigue specimens of several types were used and the effects of surface finish, rest periods, stress amplitude, mean stress, stress concentration, and temperature during repeated stress received consideration.
- An Investigation of Aircraft Heaters 8: A Simplified Method for the Calculation of the Unit Thermal Conductance Over Wings
- Report presenting a simplified approximate method of calculating the unit thermal conductance along an airfoil as a function of distance from the leading edge, by use of heat transfer data for smooth cylinders and smooth flat plates. Several examples are used in order to show the effectiveness of the method.
- An Investigation of Aircraft Heaters 9: Measured and Predicted Performance of Two Exhaust Gas-Air Heat Exchangers and an Apparatus for Evaluating Exhaust Gas-Air Heat Exchangers
- Report presenting laboratory testing to determine the thermal output and pressure drop characteristics of the Airesearch and Solar fluted-type exhaust gas-air heat exchangers. The apparatus used in these tests consisted of a natural gas furnace of 3,000,000 Btu per hour thermal capacity, a centrifugal blower, and a system of ducting and various measuring devices. Results regarding the method of analysis, the Airesearch heat exchanger tests, the solar heat exchanger tests, and a comparison of the two heat exchangers are provided.
- An investigation of aircraft heaters 10: measured and predicted performance of a fluted-type exhaust gas and air heat exchanger
- Report presenting performance data on a small exhaust gas and air heat exchanger. The heat transfer rates were measured using about 8000 pounds per hour of exhaust gas and 4300 pounds per hour of ventilating air. The thermal performance of heater no. 2 can be estimated to 3 to 17 percent by use of the method described in the report.
- Investigation of the Longitudinal Stability at High Speeds of a 1/5-Scale Model of a Tailless Pursuit Airplane
- "Tests of a tailless pursuit airplane model at the Ames Aeronautical Laboratory have shown that in conditions corresponding to level flight at a Mach number less than 0.7 and at an altitude under 35,000 feet, no serious compressibility effects occurred and that no sudden adverse diving moments were encountered up to a Mach number of 0.74, the maximum speed of the tests. However, there were indications that the elevons might lose their effectiveness for longitudinal control during a pull-out from a steep dive" (p. 1).
- A method for studying piston friction
- From Introduction: "The purpose of this investigation was to develop a method for determining directly the friction force between the piston and cylinder of an internal combustion engine. The method consists in elastically mounting the cylinder barrel so that it can have a small motion parallel to its axis, and providing suitable means for recording its instantaneous displacement."
- Newsmap. Monday, March 1, 1943 : week of February 19 to February 26, 181st week of the war, 63rd week of U.S. participation
- Front: Text describes action on various war fronts: North Africa, Russia, Burma-China, New Guinea, Solomons, Aleutians, Sinkings (sea losses). Large world map is keyed to text. Includes table: Great Circle Distances in Statute Miles. Inset map shows Tunisia. Includes photos: Nazi Panzers in Bizerte, Air base at Dakar, Hold on Kharkov, Hunting enemy submarines. Back: Poster provides recognition cues and front and profile drawings of Allied and Axis heavy, medium, and light armored cars. Includes range scale.
- Newsmap. Monday, March 8, 1943 : week of February 26 to March 5, 182nd week of the war, 64th week of U.S. participation
- Front: Text describes action on various war fronts: New Guinea -- Solomons -- Submarines -- Tunisia -- Russia -- Western Europe. Large world map is keyed to text and illustrates time zones around the world. Inset maps show Tunisia -- Moscow/Leningrad region. Includes photographs: Attack: A-20 Boston bombers in central Tunisia -- Jeep rider: South Sea islander hitches a ride on an Army jeep -- Loudspeaker on Guadalcanal -- Jap 75 on New Guinea. Back: German Navy uniforms and insignia. Includes color illustrations of uniforms and components, and insignia with informational text. Chart of German pronunciation of military ranks with equivalent ratings in U.S. and German navies.
- Newsmap. Monday, March 15, 1943 : week of March 5 to March 12, 183rd week of the war, 65th week of U.S. participation
- Front: Text describes action on various war fronts: Russia, Air offensive, Unrest (France, Belgium, Norway), Southwest Pacific, Tunisia. Large world map is keyed to text and illustrates time zones around the world. Inset maps show Russia, Tunisia. Includes photographs: Convoy to Russia; American tank in Russia; Joint Assignment; Airborne engineers; Shower bath - desert style. Back: Learn to recognize these vehicles (half-track vehicles). Labelled illustrations of American, Canadian and German vehicles with a quick guide to features for comparison.
- Newsmap. Monday, March 22, 1943 : week of March 12 to March 19, 184th week of the war, 66th week of U.S. participation
- Front: Text describes action on various war fronts: Tunisia, Aleutians, New Guinea, Solomons, Pacific and Far East, Burma-China, Russia. Large world map is keyed to text and illustrates time zones around the world. Inset maps show northern Tunisia, and along the Russian front. Includes photographs: Pulling together for victory [Chinese laborers flatten a runway with a heavy roller]; Sgt. Robert Wilson of Wichita, Kansas rides a wheelbarrow taxicab; Yanks in the Far East care for Burmese orphans; Amphibian jeeps; Wet feet are no worry [jungle fighting in New Guinea]; Allied troops wade from stream to shore [New Guinea]; American gun crew lowers their sights to fire into the jungle in New Guinea. Back: Military Courtesy. Color illustrations of Army and Navy uniforms and insignia of the United States, U.S.S.R., France, Poland, China and the British Empire. Accompanying text describes how to address each rank.
- Newsmap. Monday, March 29, 1943 : week of March 19 to March 26, 185th week of the war, 67th week of U.S. participation
- Front: Text describes action on various war fronts: Tunisia, Air offensive, Submarines, Southwest Pacific, Russia, China. Large world map is keyed to text and illustrates time zones around the world. Inset maps show Gulf of Gabes region, Moscow region. Includes photographs: Counter attack at Kasserine, New Navy planes, Enemy hospital ship. Back: Gas. 5 gases are illustrated and described; Lewisite, mustard, tear gas, phosgene and clorpicrin.
- Optimum Design of Catalytic Towers
- Abstract: "This paper gives an arithmetic method of computing the number of sections required in a catalytic tower to produce a given enrichment. It also tells how to calculate the enrichment of a tower with a given number of sections. The problem of the most economical design of catalytic towers is solved. Methods are given for determining the temperature, the efficiencies of catalyst beds and strippers, the relative production rate, and the water vapor-hydrogen gas ratio which give the optimum combination of operating pressure, cross sectional area, number of sections, and volume of catalyst in the tower. Simple directions as to how to make the calculations are included."
- Radioactivity of the Cooling Water
- The most important source of radioactivity at the exit manifold of the pile will be due to O19, formed by neutron absorption of O18. A recent measurement of Fermi and Weil permits to estimate that it will be safe to stay about 80 minutes daily close to the exit manifolds without any shield. Estimates are given for the radioactivities from other sources -- both in the neighborhood and farther away from the pile.
- Radiotelephone procedure
- "The purpose of this manual is to acquaint radio operators and pilots of the Army Air Forces with radiotelephone procedure"
- A simplified chart for determining Mach number and true airspeed from airspeed-indicator readings
- "The determination of flight Mach number from measurements of indicated airspeed and pressure altitude is shown to be relatively simple and leads to direct and accurate computation of true airspeed. A simplified chart is presented for determining flight Mach number and true airspeed for a range of values of indicated airspeed, pressure altitude, and air temperature. A table of standard atmospheric values is included" (p. 1).
- Studies on the Electrolytic Reduction of Nitric Acid
- Report discussing the reduction of nitric acid that results from its use at the cathode for the electrolysis of uranyl nitrate. From introduction: "It is the purpose of this report to give the results of studies on the reduction of nitric acid of different concentrations, at different types of electrodes, and for various current densities in order to ascertain the effects of such changes."
- Tests of a dynamic model in NACA tank number 1 to determine the effect of length of afterbody, angle of afterbody keel, gross load, and a pointed step on landing and planning stability
- Report presenting testing in tank no. 1 to determine the effect of length of afterbody, angle of afterbody keel, and gross load on the limits of stable trims and landing characteristics of a model of a flying boat with conventional steps. The studies were made with four lengths of afterbody, four angles of afterbody keel, and five gross loads. Results regarding the trim limits of stability and landing stability are provided.
- A Theoretical Investigation of the Lateral Oscillations of an Airplane With Free Rudder With Special Reference to the Effect of Friction
- Report presenting charts showing the variation in dynamic stability with the rudder hinge-moment characteristics. A stabilizing rudder floating tendency combined with a high degree of aerodynamic balance is shown to lead to oscillations of increasing amplitude.
- A Theoretical Investigation of the Lateral Oscillations of an Airplane With Free Rudder With Special Reference to the Effect of Friction
- "Charts showing the variation in dynamic stability with the rudder hinge-moment characteristics are presented. A stabilizing rudder floating tendency combined with a high degree of aerodynamic balance is shown to lead to oscillations of increasing amplitude. This dynamic instability is increased by viscous-friction in the rudder control system" (p. 147).
- Time-velocity-altitude relations for an airplane diving in a standard atmosphere
- Report presenting the determination of time-velocity-altitude relations for airplanes diving in standard atmosphere, which replaces several previous technical reports.
- Torsion of flanged members with cross sections restrained against warping
- "The longitudinal stresses and the stiffness of flange members - I-beams, channels, and Z-bars - were investigated when these members were subjected to torque with constraint against cross-sectional warping. Measured angles of rotation agreed with corresponding calculated values in which the torsion bending factor of the cross section was involved; the agreement was better for the I-beam and the Z-bar than for the channel. Longitudinal stresses measured at the mid-span were found to agree with the calculated values that involved unit warping as well as the torsion-bending factors: the channel showed the greatest discrepancy between measured and calculated values" (p. 1).
- Transition Between Laminar and Turbulent Flow by Transverse Contamination
- Note presenting tests carried out on a flat plate in a low-turbulence constant-pressure tunnel, which showed that the transition between laminar and turbulent flow could be caused in a normally laminar region by a process of transverse contamination.
- Turbulent Flow Between Rotating Cylinders
- "The turbulent air flow between rotating cylinders was investigated. The distributions of mean speed and of turbulence were measured in the gap between a rotating inner and a stationary outer cylinder. The measurements led to the conclusion that the turbulent flow in the gap cannot be considered two dimensional, but that a particular type of secondary motion takes place. It is shown that the experimentally found velocity distribution can be fully understood under the assumption that this secondary motion consists of three-dimensional ring-shape vortices" (p. 1).
- Water analyses: Project 9536
- No Description Available.
- Wind-Tunnel Investigation of Trimming Tabs on a Thickened and Beveled Aileron on a Tapered Low-Drag Wing
- Report presenting an investigation in the 7- by 10-foot tunnel of three inset tabs and of one attached tab on the beveled aileron of a low-drag wing. The results indicated that, of the arrangements tested, an inset tab with a chord 50 percent of the aileron chord provided the most satisfactory trimming characteristics on a beveled aileron.
- Wind-Tunnel Tests of Two Tapered Wings with Straight Trailing Edges and with Constant-Chord Center Sections of Different Spans
- Report presenting tests made in the 19-foot pressure tunnel to determine the aerodynamic characteristics of two tapered wings with NACA 230-series airfoil sections, constant-chord center sections, and straight trailing edges. Lift, drag, and pitching-moment characteristics of the wings with partial-span and full-span split flaps are given for a test Reynolds number of 4,600,000.
- XC-35 gust research project: Preliminary analysis of the lateral distribution of gust velocity along the span of an airplane
- Report presenting measurements of the lateral distribution of effective gust velocity along the span of the XC-35 airplane in a variety of weather conditions. Six standard shapes were determined from the distributions: triangular, rectangular, first trapezoidal, second trapezoidal, unsymmetrical, and double triangular.