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Evaluation of Gust and Draft Velocities from Flights of P-61c Airplanes within Thunderstorms August 7, 1946 to August 13, 1946 at Orlando, Florida

Description: This report presents the results obtained from gust and draft velocity measurements within thunderstorms for the period August 7, 1946 to August, 13, 1946 at Orlando Florida. In several of the surveys, indications of ambient air temperature were obtained from photo-observer records. These data are summarized in the report.
Date: December 9, 1946
Creator: Tolefson, Harold B.
Partner: UNT Libraries Government Documents Department

Spectrophotometric Evidence for the Existence of UCl₅ as the Double Compound UCl₆ and UCl₄

Description: Abstract: "Spectrophotometric evidence for the existence of UCl₅ as a double compound UCl₆ and UCl₄ has been obtained by studying the absorption spectra of these chlorides in CCl₄ and SOCl2 solutions in the visible and ultraviolet regions of the spectrum."
Date: December 9, 1946
Creator: Sterett, C. C. & Calkins, V. P.
Partner: UNT Libraries Government Documents Department

100 Areas technical activities report - physics, September 1946

Description: The Pine unit was down four times during the month. These were all regularly scheduled shutdowns. Times down vary from 16.9 hours to 19.2 hours. A total of 33.4 tons of metal was discharged. The galvano-meter chamber in experimental hole {open_quotes}A{close_quotes} was replaced. One Special Request was discharged and three tubes have been loaded with Special Request samples. A new bismuth column has been established. Some difficulty has been experienced with high temperatures of both tube exit water and graphite following startup. On one occasion the normal operating level was exceeded for a short period of time.
Date: October 9, 1946
Creator: Montgomery, E. B.
Partner: UNT Libraries Government Documents Department

Altitude cooling investigation of the R-2800-21 engine in the P-47G airplane 2: investigation of the engine & airplane variables affecting the cylinder temperature distribution

Description: "The data obtained from cooling tests of an R-2800-21 engine installed in a P-47G airplane were studied to determine which engine and airplane operation variables were mainly responsible for the extremely uneven temperature distribution among the 18 engine cylinders obtained at the medium and high engine-power conditions. The tests consisted of flights at altitudes from 5000 to 35,000 feet for the normal range of engine and airplane operation. The results of the study showed that a flow condition in the induction system associated with the wide-open throttle position, which affected either the fuel air or charge distribution, was primarily responsible for the uneven temperature distribution" (p. 1).
Date: October 9, 1946
Creator: Pesman, Gerard J. & Kaufman, Samuel J.
Partner: UNT Libraries Government Documents Department

Altitude cooling investigation of the R-2800-21 engine in the P-47g airplane 3: individual-cylinder temperature reduction by means of intake-pipe throttle and by coolant injection

Description: "Flight tests were conducted on a R-2800-21 engine in the P-47G airplane to determine the effect on the wall temperatures of cylinder 10 of throttling the charge in the intake pipe and of injecting a water-ethanol coolant into the intake pipe. Cylinder 10 was chosen for this investigation because it runs abnormally hot (head temperatures of the order of 45 F higher than those of the next hottest cylinder) at the medium and high-power conditions. Tests with interchanged cylinders showed that the excessive temperatures of cylinder 10 were inherent in the cylinder location and were not due to the mechanical condition of the cylinder assembly" (p. 1).
Date: October 9, 1946
Creator: Bell, E. Barton; Valerino, Michael F. & Manganiello, Eugene J.
Partner: UNT Libraries Government Documents Department

Analytical investigation of the use of regeneration in compressor-turbine-propeller systems

Description: From Introduction: "The purpose of the present paper is to show in more detail the possibilities end the limitations of the use of regeneration as a means of effecting greater fuel economy and of reducing the net weight of the power plant and fuel of compressor-turbine-propeller aircraft engines."
Date: September 9, 1946
Creator: Wood, George P.
Partner: UNT Libraries Government Documents Department

Half-Life of Polonium

Description: Abstract: "The half-life of polonium has been measured by a calorimetric method using samples several thousand times larger than have been previously available. The value is found to be 138.3 +/- 0.1% days."
Date: September 9, 1946
Creator: Beamer, William H. & Easton, William E.
Partner: UNT Libraries Government Documents Department

Investigation of Three Design Modifications of the NACA Injection Impeller in an R-3350 Engine

Description: An investigation was conducted to determine the effects of three design modifications of the original NACA injection impeller on the performance of an R-3350 engine. Different methods of injecting the fuel into the impeller air stream were studied and evaluated from the individual cylinder fuel-air ratios and the resulting cylinder temperatures. Each impeller was tested for a range of engine powers normally used in flight operation. The relatively simple design of the original injection impeller produced approximately the same mixture- and temperature-distribution characteristics as the modified impellers of more complex design. None of the modifications appreciably affected the manifold pressure, the combustion-air flow, nor the throttle angle required to maintain a given engine power,.
Date: September 9, 1946
Creator: Hickel, Robert O. & Michel, Donald J.
Partner: UNT Libraries Government Documents Department

Technical Department report on production test No. 313-78-M: Study for evaluation of slug dimensions

Description: The present system of classifying slugs intended for canning provides for individual measurement of dimensions on first-run MZ material, but not for their individual weighing. While the total and average weights of this type of material are determined on batches of twenty, this operation is for purposes of accounting only, and no concern is normally attached to the functional aspects of varying weights. It is thought desirable to obtain information relative to this problem. Collection of such information constitutes one of the purposes of the present test. Other purposes include collection of information which will aid in: Evaluating the improvement in overall yield brought about by adoption of the MZ diameter slugs; establishment of more suitable minimum diameter limits for recovered slugs if the present ones prove unsatisfactory; and setting up inspection procedures, if indicated, to cover measurement of dimensions as well as of weights of recovered slugs. This report provides results of this test.
Date: July 9, 1946
Creator: Smith, E. A.
Partner: UNT Libraries Government Documents Department

High-altitude flight cooling investigation of a radial air-cooled engine

Description: "An investigation of the cooling of an 18-cylinder, twin-row, radial, air-cooled engine in a high-performance pursuit airplane has been conducted for variable engine and flight conditions at altitudes ranging from 5000 to 35,000 feet in order to provide a basis for predicting high-altitude cooling performance from sea-level or low altitude experimental results. The engine cooling data obtained were analyzed by the usual NACA cooling-correlation method wherein cylinder-head and cylinder-barrel temperatures are related to the pertinent engine and cooling-air variables. A theoretical analysis was made of the effect on engine cooling of the change of density of the cooling air across the engine (the compressibility effect), which becomes of increasing importance as altitude is increased" (p. 267).
Date: May 9, 1946
Creator: Manganiello, Eugene J.; Valerino, Michael F. & Bell, E. Barton
Partner: UNT Libraries Government Documents Department

The Detection of Uranium by X-ray Spectrometry

Description: Abstract: "The possibility of detecting small quantities of uranium with an X-ray spectrometer was investigated. An X-ray spectrograph was modified by substituting a geiger counter for the photographic film. Both primary and secondary methods of excitation were studied. Radiation background of high intensity and variability limits the sensitivity of the present apparatus to 1%. Suggestions are made for increasing the sensitivity of the method."
Date: April 9, 1946
Creator: Saunders, B. G.; Burkhart, L. E. & Larson, C. E.
Partner: UNT Libraries Government Documents Department