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The Activator, Volume 1, Number 5, February 1945

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: February 1945
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

Addition of Heat to a Compressible Fluid in Motion

Description: From Introduction: "The purpose of this report is to summarize, without extended proofs, the results of a study of a simplified model of nonadiabiatic, compressible fluid flow, both subsonic and supersonic, and to state these results in a form that will make them immediately useful in providing a theoretical background for current technical problems of high-speed combustion.
Date: February 1945
Creator: Hicks, Bruce L.
Partner: UNT Libraries Government Documents Department

An Analysis of Jet-Propulsion Systems Making Direct Use of the Working Substance of a Thermodynamic Cycle

Description: From Summary: "The results of the analysis showed that the combined efficiency, which is unacceptably low at speeds less than 300 miles per hour, becomes nearly equal to that of conventional power plants of current design at 500 miles per hour. It was also shown that the efficiency will be increased considerably as the physical limitations on cycle temperature and blower speed are raised and as the efficiencies of the system components are improved."
Date: February 1945
Creator: Rubert, Kennedy F.
Partner: UNT Libraries Government Documents Department

Bearing strengths of 75S-T aluminum-alloy sheet and extruded angle

Description: Report presenting an investigation to determine the bearing yield and ultimate strengths of 75S-T alloy in sheet form in both with- and across-grain directions and extruded angle in the longitudinal direction. Ratios of bearing to tensile properties were also determined.
Date: February 1945
Creator: Wescoat, C. & Moore, R. L.
Partner: UNT Libraries Government Documents Department

Comparison of observed and calculated flattening at 105-D

Description: The total power output of a unit may be represented by the power output of the most productive tube or tubes multiplied by a quantity designated as the ``number of effective tubes.`` The number of effective tubes observed at 105-D under two different arrangements of poisoned columns has been compared with values of this quantity calculated from theory. It was found that in each case the observed number of effective tubes was about 5% less than the ideal number obtainable by an optimum arrangement of the poison. In the case in which two poisoned columns in the pile took up 110 ih it was found that the loss consisted of 2% due to the necessary presence of a control rod in the pile and 3% due to the fact that the actual arrangement of the poison was not the optimum one. In the case in which a single, off center, poison column took up 60 ih, it was found that very little of the loss was due to the presence of the control rod and almost all of it was due to the eccentric position of the P-column. As a further result of this study, it was found that, apart from perturbations introduced by the presence of a control rod, the actual distribution of power production in the pile represented very closely by the theoretical expressions.
Date: February 14, 1945
Creator: Gast, P. F.
Partner: UNT Libraries Government Documents Department

A Cooling Correlation of the Wright R-2600-8 Engine Showing the Effect of Water as an Internal Coolant

Description: Report presenting an attempt to establish a correlation of the cooling characteristics of the Wright R-2600-8 engine with water as an internal coolant and to investigate methods of introducing the water. A cooling correlation, including the effect of water as an internal coolant, was established by use of the NACA cooling-correlation method. Results regarding the cooling-performance predictions and engine condition are provided.
Date: February 1945
Creator: Koenig, Robert J. & Engelman, Helmuth W.
Partner: UNT Libraries Government Documents Department

Cooling of a Double-Row Radial Engine by Water Injection to the Individual Cylinders

Description: "An injection system that supplies water to each cylinder of a double-row radial engine was tested...as part of a general investigation of the power-plant installation of a four-engine heavy bomber. The tests were conducted to determine the effectiveness of water injection in cooling the engine during take-off. The injection of 500 pounds of water at the take-off power condition reduced the maximum measured exhaust-valve-seat temperature 64 degrees Fahrenheit and the maximum spark-plug-gasket temperature 55 degrees Fahrenheit" (p. 1).
Date: February 1945
Creator: Monroe, Louis L. & Friedman, Harold E.
Partner: UNT Libraries Government Documents Department

Correlation of the drag characteristics of a P-51B airplane obtained from high-speed wind-tunnel and flight tests

Description: Report presenting an investigation of a P-513 airplane with the propeller removed in flight at Mach numbers up to 0.755 and a comparison of those results with those of a wind tunnel test with a scale model.
Date: February 1945
Creator: Nissen, James M.; Gadeberg, Burnett L. & Hamilton, William T.
Partner: UNT Libraries Government Documents Department

Determination of the Effect of Horizontal-Tail Flexibility on Longitudinal Control Characteristics

Description: Report presenting an iteration method for determining the longitudinal control characteristics of a flexible horizontal tail. The method permits factors such as the actual spanwise variation of elasticity and the aerodynamic induction effects due to three-dimensional flow to be accounted for to any degree of accuracy needed. An analysis is also included of the effects of horizontal-tail flexibility on the tail effectiveness, the hinge-moment characteristics, and the control-force gradients in a dive recovery for two modern fighter airplanes.
Date: February 1945
Creator: Harmon, S. M.
Partner: UNT Libraries Government Documents Department

Determination of the Stability and Control Characteristics of a Tailless All-Wing Airplane Model with Sweepback in the Langley Free-Flight Tunnel

Description: Force and flight tests were performance on an all-wing model with windmilling propellers. Tests were conducted with deflected and retracted flaps, with and without auxiliary vertical tail surfaces, and with different centers of gravity and trim coefficients. Results indicate serious reduction of stick-fixed longitudinal stability because of wing-tip stalling at high lift coefficient. Directional stability without vertical tail is undesirably low. Low effective dihedral should be maintained. Elevator and rudder control system is satisfactory.
Date: February 1945
Creator: Campbell, John P. & Seacord, Charles L., Jr.
Partner: UNT Libraries Government Documents Department

Dilution of Exhaust-Gas Samples From a Multicylinder Engine Equipped With an Exhaust-Gas Collector

Description: Report discusses the results of an investigation to determine the effect of a collector ring on exhaust-gas sampling. The results of tests to determine the percentage by volume of exhaust gas from the collector ring are presented for several engine powers and speeds. The danger of air dilution from the breathing action of the engine is almost entirely eliminated by the use of a collector ring.
Date: February 1945
Creator: Butze, Helmut F.
Partner: UNT Libraries Government Documents Department

Effect of changing the stroke on air capacity, power output and detonation of a single-cylinder engine

Description: Report presenting an investigation of a special single-cylinder test engine constructed with provision for operation with three different lengths of piston stroke. Results regarding the air capacity of the engine, extent to which the spark must be retarded in order to prevent detonation, and brake mean effective pressure are provided.
Date: February 1945
Creator: Livengood, James C. & Eppes, James V. D.
Partner: UNT Libraries Government Documents Department

The Effect of Compression Ratio on Knock Limits of High-Performance Fuels in a CFR Engine 3: Blends of 2,3-Dimethylpentane With 28-R

Description: Report discussing the knock-limited performance of blends of 2,3-dimethylpentane and 23-R fuel in an F-4 engine at three sets of conditions and three compression ratios. The knock-limited performance of 2,3-dimethylpentane has about the same sensitivity to compression ratio and inlet-air temperature as 28-R fuel.
Date: February 10, 1945
Creator: Alquist, Henry E. & Tower, Leonard K.
Partner: UNT Libraries Government Documents Department

The Effect of High Temperature of the Cylinder Head on the Knocking Tendency of an Air-Cooled Engine Cylinder

Description: Report presenting the results of tests to determine the extent to which the knocking tendency of an air-cooled engine cylinder is increased when the cylinder head is poorly cooled and when the cylinder temperature exceeds the maximum specified by the engine manufacturer. The tests showed that, when the cylinder-head temperature was increase from 400 to 600 degrees Fahrenheit, the knock-limited indicated mean effective pressure was reduced 3 percent at a fuel-air ratio of 0.097 and 39 percent at a fuel-air ratio of 0.065.
Date: February 1945
Creator: Sanders, J. C. & Peters, M. D.
Partner: UNT Libraries Government Documents Department

Effect of Increasing the Size of the Valve-Guide Boss on the Exhaust-Valve Temperature and the Volumetric Efficiency of an Aircraft Cylinder

Description: "An exhaust-port design was developed that provides a heat-flow path of increased area from the valve stem to the outside surface of a Wright C9GC cylinder. The effects of the new port design on exhaust-valve temperature and volumetric efficiency were determined from single-cylinder engine tests. A reduction of 70 degrees Fahrenheit in the exhaust-valve temperature was obtained with no decrease in volumetric efficiency or power output" (p. 1).
Date: February 1945
Creator: Peters, Max D.
Partner: UNT Libraries Government Documents Department

Effect of progressive ring failure on piston destruction

Description: Report presenting an investigation of the effect of progressive ring failure on piston life. Two endurance runs were conducted on an Allison single-cylinder engine at high power output until destruction of the pistons occurred at 33.1 and 84.25 hours.
Date: February 1945
Creator: Tauschek, Max J. & Corrington, Lester C.
Partner: UNT Libraries Government Documents Department

An Electron-Diffraction Examination of Cast-Iron Piston Rings From Single-Cylinder Aircraft Engine Tests

Description: Report presenting an electron-diffraction examination of cast-iron piston rings used in a single-cylinder test engine, which showed the presence of a layer of graphite covering the surface. The wear curves from the rings studied had shown variation from high rates to very low rates of wear.
Date: February 1945
Creator: Nowick, A. S. & Brockway, L. O.
Partner: UNT Libraries Government Documents Department

Fatigue Tests on 1/8-inch Aluminum Alloy Rivets

Description: Note presenting an investigation of the fatigue characteristics of riveted joints in aluminum alloy sheet. The purpose of this report is to summarize all the results of fatigue tests that have been made to date in the Aluminum Research Laboratories of lap joints with 1/8-inch aluminum alloy rivets.
Date: February 1945
Creator: Andrews, H. J. & Holt, M.
Partner: UNT Libraries Government Documents Department

Flight and Test-Stand Investigation of High-Performance Fuels in Double-Row Radial Air-Cooled Engines 3: Comparison of Cooling Characteristics of Flight and Test-Stand Engines

Description: Report presenting the cooling characteristics of a 14-cylinder double-row radial air-cooled engines in a test stand and in flight. Three types of cooling tests were made for both engines: variable charge-air flow, variable cooling-air pressure drop, and variable fuel-air ratio. For the same operating conditions, the test-stand engine was found to run consistently cooler than the flight engine.
Date: February 1945
Creator: White, H. Jack; Blackman, Calvin C. & Dandois, Marcel
Partner: UNT Libraries Government Documents Department

Flight Measurements of the Flying Qualities of an F6F-3 Airplane (BuAer No. 04776) 1: Longitudinal Stability and Control

Description: Report discussing flight measurements of the handling qualities of an F6F-3 obtained over the course of thirty flights and under a variety of conditions. The longitudinal stability and control of the plane were found to be satisfactory by the test pilots. Information about the elevator control, flaps, and the longitudinal trimming device is provided in greater detail.
Date: February 13, 1945
Creator: Williams, Walter C. & Reeder, John P.
Partner: UNT Libraries Government Documents Department

Flight Measurements of the Flying Qualities of an F6F-3 Airplane (BuAer No. 04776) 2: Lateral and Directional Stability and Control

Description: Report discussing the lateral and directional stability and control of the F6F-3 airplane in a variety of flying conditions. Information about the control-free lateral oscillations, aileron control characteristics, maximum sideslip, dihedral effect, blow-up characteristics of the landing flaps, rudder, pitching moment, and power of the rudder trim tab and aileron trim tab is included.
Date: February 13, 1945
Creator: Williams, Walter C. & Reeder, John P.
Partner: UNT Libraries Government Documents Department