Memorandum presenting an instrument for recording and indicating the frequency and intensity of aircraft icing conditions to obtain statistical icing data over worldwide air routes during routine airline operations. Data of this type is needed to provide pertinent meteorological information necessary for the optimum design of ice-protection systems. The features that make this particular instrument desirable include the simplicity of operation, freedom from maintenance and operating problems, automatic operation upon encountering an icing condition, visual indications of icing intensity available to the pilot, total weight of 18 pounds, and continuous recorded data.

Report presenting a review of the present status of research and development on high-energy fuels for ramjet propulsion. It also presents experimental investigations on the use of high-energy fuels in ram jets that include the materials aluminum, boron, boron hydrides, carbon, coal and coal-light metal compositions, liquid hydrogen, and magnesium. A comparison of the fuels in terms of heating values, combustion temperatures and specific impulse, and availability of fuels are provided.

Report describing the optical system of a new-type interferometer utilizing schileren optics. Using this instrument, former limits to the working-field size imposed by the practical size of conventional topics are removed. Testing using the interferometer occurred in the 18- by 18-inch supersonic tunnel.

Report presenting the results of an experimental investigation of the pressure distribution over two triangular wings at supersonic speeds. The two wings which were tested had identical plan forms, 45 degrees of sweepback of the leading edge, and an aspect ratio of 4.0, but different airfoil sections. Results regarding the pressure distribution at zero lift, flow characteristics and pressure distribution at angles of attack, normal-force coefficients, and application of results to other triangular wings are provided.

Report presenting rocket-powered flight investigations for the purpose of comparing damping-in-roll results obtained from a torque-nozzle technique. Results regarding basic aerodynamic quantities, data from the torque-nozzle technique, wing-dropping phenomenon, and comparison of the values of the two techniques are provided.

"An investigation of the altitude performance characteristics of an Allison J35-A-17 turbojet engines have been conducted in an altitude chamber at the NACA Lewis laboratory. Engine performance was obtained over a range of altitudes from 20,000 to 60,000 feet at a flight Mach number of 0.62 and a range of flight Mach numbers from 0.42 to 1.22 at an altitude of 30,000 feet. The performance of the engine over the range investigated could be generalized up to an altitude of 30,000 feet" (p. 1).

Elevated-temperature properties of titanium carbide base ceramals containing nickel or iron were determined in oxidation, modulus of rupture, tensile strength, and thermal-shock resistance. These materials followed the general growth law and exhibited two stages in oxidation. The following tensile strengths were found at 2000 degrees F: 13.3 weight percent nickel, 16, 150 pounds per square inch; 11.8 weight percent iron, 12,500 pounds per square inch; unalloyed titanium carbide, 16,450 pounds per square inch. Nickel or iron additions to titanium carbide improved the thermal-shock resistance, nickel more. The path of fracture in tensile and thermal-shock specimens was found to progress approximately 50 percent intergranularly and 50 percent transgranularly.

Memorandum presenting the results of an investigation to establish rupture and total-deformation strengths at 1200 and 1800 degrees Fahrenheit for typical commercial treatments of low-carbon N-155 alloy. The results show that there were large differences in strength between the heats of bar stock at temperatures above 1200 degrees Fahrenheit except when a 2200 degree Fahrenheit solution treatment was used.

"An instrument for recording and indicating the frequency and intensity of aircraft icing conditions encountered in flight has been developed by the NACA Lewis Laboratory to obtain statistical icing data over world-wide air routes during routine airline operations. The operation of the instrument is based on the creation of a differential pressure between an ice-free total-pressure system and a total-pressure system in which small total-pressure holes vented to static pressure are allowed to plug with ice accretion. The simplicity of this operating principle permits automatic operation, and provides relative freedom from maintenance and operating problems" (p. 1).

From Introduction: "Good experimental correlation of the analytical results was obtained for the compressor even though isentropic flow and axial symmetry were assumed (reference 1). In order to determine the flow through the turbine being investigated, however, it was necessary to extend the method of reference 1 to include the flow downstream of the rooter since the large blade taper and hub-shroud curvature caused downstream conditions which affected the flow inside the rotor."

Report presenting the longitudinal stability and control of a canard model employing a triangular wing of aspect ratio 2 and a control surface of identical plan form at Mach numbers up to 0.95. The fixed control surface was effective in producing pitching moments at angles of incidence up to 10 degrees. Results regarding the static longitudinal characteristics, control-surface effectiveness, stability and effectiveness derivatives, and evaluation of the split flap effectiveness are provided.

Memorandum presenting an extension of the tube method of measuring flame velocities to fundamental flame velocities of 141 centimeters per second. The extension was accomplished by reducing the flame-tube diameter from 25 to 12.5 millimeters. Results regarding the gas flow and spatial flame velocity, flame surface area, and fundamental flame velocity are provided.

Report presenting a free-flight investigation of two rocket-powered control research models to determine the force and hinge-moment characteristics at zero angle of attack of a half-delta tip control on a delta wing. Results regarding the control hinge moments, control normal force, and calculated hinge moments are provided.

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, Price Daniel, regarding a legal question submitted for clarification: Authority of the Commissioners' Court to waive limitations and pay the County Judge for services as a member of the Juvenile Board when the salary claim would otherwise be barred by limitations.

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, Price Daniel, regarding a legal question submitted for clarification: Appointment of State agencies, political subdivisions of the State, or municipalities to operate motor vehicle inspection station which will inspect only their own motor vehicles.

This is the monthly 100 areas technical activities report for the physics group for the month of July 1951. This group was concerned with pile related studies. Work discussed includes neutron attenuation measurements in pile shielding test facilities, studies of physical properties of shielding materials (concrete), work on a xenon generator and separation facility, further development and shielding work for a neutron spectrometer, continued work on a magnetic spectrometer, and counting equipment. Studies of neutron fluxes from exponential piles, and criticality studies are also discussed.

All of the 231 Building final product was prepared for off-site shipment prior to the startup of the 234-5 Building. The evaporator (S-1) effluent, a solution approximately 10 molar in nitric acid with plutonium concentration of 275 grams/liter, was dried within the shipping container (sample can) to a solid cake. The purpose of this drying operation was to minimize personnel contamination and/or loss of product during shipment. The dried cake was redissolved in water before further purification steps could be performed. The procedures for testing the purification of AT solution as recommended by the development group (6) were presented in Production Test 231-10 Supplement B. Production Test 231-10 Supplement B was initiated to establish the procedures for the precipitation of Plutonium (III) Oxalate in Plant equipment from AT solutions. The current report is written to provide a history of: Work done and data collected during the test, and Conclusions and Recommendations obtained from studies of the data.

The following report describes a countercurrent extraction column, which employs timed solenoid valves and pressurized feeds to provide a pulsing action to disperse the phases. This report further describes the 4-stage cycle of the column operation.

From introduction: "The purpose of this report is to present some design and construction data for automatic titrators."

The following report describes a study that was made to adapt a redox method that oxidizes uranium(IV) to uranium(VI) by ferric ion into a microcoulometric method.

This report provides a table that summarizes the data taken from investigations of gamma radiation of the Bulk Shielding Reactor in an iron-water mixture. The results are plotted on a graph also provided in this document.

The following report describes methods developed for determination of uranium in the alloy.

None

The policy of operating the Hanford Piles at the highest level attainable under existing standards has resulted in pile levels` being occasionally limited by maximum permissible exit water temperatures. The practicability of using refrigeration to reduce the inlet water temperature during peak periods and so increase pile levels has been reviewed and is discussed in this document.