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A Method for Studying the Longitudinal Dynamic Stability of Flying-Boat-Hull Models at High Planing Speeds and During Landing

Description: Report presenting an investigation of a method of studying the longitudinal dynamic stability of flying-boat-hull models, as instability may be encountered when flying a flying boat on the water at high speeds and high trim angles, especially upper-limit porpoising and skipping. A method is described for carrying out generalized experimental studies of the longitudinal dynamic stability of flying-boat-hull models.
Date: April 1945
Creator: Locke, F. W. S., Jr. & Hugli, W. C., Jr.
Partner: UNT Libraries Government Documents Department

Low-Pressure Boundary-Layer Control in Diffusers and Bends

Description: Report presenting tests to study the effectiveness of small pressure differences in removing the dust boundary layer through slots in the duct wall of airplane ducts and reducing separation losses. Two-dimensional diffusers of 15 and 30 degrees included angles and some 90 degree bends were tested. The 30 degree diffuser was tested with and without an intercooler.
Date: April 1945
Creator: Biebel, William J.
Partner: UNT Libraries Government Documents Department

Flight Investigation of Boundary-Layer Transition and Profile Drag of an Experimental Low-Drag Wing Installed on a Figher-Type Airplane

Description: Report presenting a boundary-layer-transition and profile-drag investigation conducted on an experimental low-drag wing installed on a P-47 airplane designated the XP-47F. Measurements were made at a section outside the propeller slipstream with smooth and with standard camouflage surfaces and on the upper surface of a section in the propeller slipstream with the surface smoothed. Results regarding the right wing section outside the slipstream and left wing section in the propeller slipstream are provided.
Date: April 1945
Creator: Zalovcik, John A. & Skoog, Richard B.
Partner: UNT Libraries Government Documents Department

An Investigation of Aircraft Heaters 21: Measured and Predicted Performance of a Flattened-Tube Type Crossflow Exhaust Gas and Air Heat Exchanger

Description: Report presenting data on the thermal performance and the static pressure drop characteristics of a flattened-tube type crossflow exhaust gas and air heat exchanger. The measured thermal outputs and static pressure drops are compared with predicted magnitudes.
Date: April 1945
Creator: Boelter, L. M. K.; Guibert, A. G.; Rademacher, J. M.; Romie, F. E.; Sanders, V. D. & Sloggy, L. J. B.
Partner: UNT Libraries Government Documents Department

An Investigation of Aircraft Heaters 25: Use of the Thermopile Radiometer

Description: Report presenting an analysis of the thermopile radiometer as used in the measurement of irradiation and radiant power interchange is given. The theory of the instrument when used to measure irradiation and net radiant power interchange is developed, and the precautions to be observed when using it for these measurements are presented.
Date: April 1945
Creator: Boelter, L. M. K.; Bromberg, R.; Gier, J. T. & Dempster, E. R.
Partner: UNT Libraries Government Documents Department

Effect of Aging Aircraft Structures on Magnesium Parts

Description: Note presenting an analysis of a procedure for artificially aging assemblies and subassemblies to improve the strength properties of the wrought aluminum alloys comprising their principal structure. Information is given on the magnesium alloys which may be present. The forms in which magnesium alloys may be encountered are casings, extrusions, forgings, and sheet.
Date: April 1945
Creator: Winston, A. W.
Partner: UNT Libraries Government Documents Department

Flight Investigation of Boundary-Layer Transition and Profile Drag of an Experimental Low-Drag Wing Installed on a Fighter-Type Airplane

Description: Report presenting a boundary-layer transition and profile-drag investigation on an experimental low-drag wing installed on a P-47 airplane designated the XP-47F and supplied by the Army Air Forces. Measurements were made at a section outside the propeller slipstream with smooth and with standard camouflage surfaces and on the upper surface of a section in the propeller slipstream with the surface smoothed.
Date: April 1945
Creator: Skoog, Richard B.
Partner: UNT Libraries Government Documents Department

Ditching Tests With 1/16-Size Models of the Army B-17 Airplane in Langley Tank Number 2 and on an Outdoor Catapult

Description: Report presenting tests with dynamically similar models made to study the behavior of the Army B-17F and B-17G when ditched and to determine the best way to land them in calm and rough water. Various landing attitudes, speeds, and conditions of damage were simulated. The ideal landing condition was found to be in a three-point landing attitude and with the flaps 45 degrees at the slowest possible speed.
Date: April 1945
Creator: Tarshis, Robert P. & Stewart, Thelma
Partner: UNT Libraries Government Documents Department

The inward bulge type buckling of monocoque cylinders 3: revised theory which considers the shear strain energy

Description: Report presenting the third part of an investigation dealing with the inward bulge type buckling of monocoque cylinders the theory of buckling in pure bending, which is refined through the consideration of the shear strain energy stored in the sheet covering, the assumption of a revised deflected shape of the rings, and the use of summations in place of some of the integrations of the preceding report.
Date: April 1945
Creator: Hoff, N. J. & Klein, Bertram
Partner: UNT Libraries Government Documents Department

An investigation of aircraft heaters 22: measured and predicted performance of a fluted-type exhaust gas and air heat exchanger

Description: Report presenting data on the thermal performance and static and total pressure drop characteristics of a fluted-type exhaust gas and air heat exchanger. Results regarding heat transfer, pressure drop, and non-isothermal pressure drop are provided.
Date: April 1945
Creator: Boelter, L. M. K.; Guibert, A. G.; Rademacher, J. M. & Romie, F. E.
Partner: UNT Libraries Government Documents Department

An investigation of aircraft heaters 20: measured and predicted performance of a finned-type cast-aluminum crossflow exhaust gas and air heat exchanger

Description: Report presenting data on the thermal performance and static pressure drop of a finned-type cast-aluminum exhaust gas and air heat exchanger. Results regarding heat transfer, isothermal pressure drop, and heater surface temperature are provided.
Date: April 1945
Creator: Boelter, L. M. K.; Guibert, A. G.; Rademacher, J. M.; Romie, F. E. & Sanders, V. D.
Partner: UNT Libraries Government Documents Department

An investigation of aircraft heaters 23: measured and predicted performance of a flat-plate type exhaust gas and air heat exchanger

Description: Report presenting results of tests of the thermal performance and the static pressure drop characteristics of a flat-plate type exhaust gas and air heat exchanger. The ventilating air shroud built into the heat exchanger gives characteristics of cross flow and parallel flow.
Date: April 1945
Creator: Boelter, L. M. K.; Guibert, A. G.; Rademacher, J. M. & Sanders, V. D.
Partner: UNT Libraries Government Documents Department

Trace Elements Investigations the Occurrence of Indium

Description: The following report is the third in the Geological Survey's series discussing rare or uncommon elements and possible sources. The element discussed in this report is indium, found abundantly in sphalerites.
Date: April 1945
Creator: Fleischer, Michael & Harder, James O.
Partner: UNT Libraries Government Documents Department

The knock-limited performance of fuel blends containing aromatics 4: data for m-diethylbenzene, 1-ethyl-4-methylbenzene and sec-butylbenzene together with a summarization of data for 12 aromatic hydrocarbons

Description: Report presenting knock-limited performance data obtained with several small-scale engines for blends containing nine aromatic hydrocarbons blended individually in various concentrations with selected base fuels.
Date: April 1945
Creator: Meyer, Carl L. & Branstetter, J. Robert
Partner: UNT Libraries Government Documents Department

The knock-limited performance of fuel blends containing aromatics Part 3: 1,3,5-trimethylbenzene, tert-butylbenzene and 1,2,4-trimethylbenzene

Description: Report presenting knock-limited small-scale-engine testing of several different types of aromatics mixed with selected base fuels. Data was obtained to determine the blending sensitivity, lead susceptibility, and the sensitivity of the blends to inlet-air temperature.
Date: April 1945
Creator: Meyer, Carl L. & Branstetter, J. Robert
Partner: UNT Libraries Government Documents Department

Efficiency tests of a single-stage impulse turbine having an 11.0-inch pitch-line diameter wheel with air as the driving fluid

Description: Report presenting efficiency tests on a single-stage impulse turbine with an 11.0-inch pitch-line diameter wheel and a fabricated nozzle diaphragm with air at moderate temperature as the driving fluid. Results regarding the variation of turbine efficiency with blade-to-jet speed ratio over a range of turbine pressure ratios and maximum efficiency are provided.
Date: April 1945
Creator: Gabriel, David S. & Carman, L. Robert
Partner: UNT Libraries Government Documents Department

Measurements in flight of the pressure distribution on the right wing of a P-39N-1 airplane at several values of Mach number

Description: Report presenting pressure-distribution measurements made on the right wing of a P-39N-1 airplane at values of Mach number up to 0.80. A considerable portion of the lift was carried by components of the airplane other than the wings, and the proportion carried by the wing varies considerably with Mach number. Results regarding the variation of wing loads and moments with Mach number, internal wing pressure, and airplane lift-curve slope are provided.
Date: April 1945
Creator: Clousing, Lawrence A.; Turner, William N. & Rolls, L. Stewart
Partner: UNT Libraries Government Documents Department

Tank Tests of a Flying-Boat Model Equipped With Several Types of Fairing Designed to Reduce the Air Drag of the Main Step

Description: "Tank tests were made of a flying-boat model having various types of fairing with and without ventilation ducts behind the main step to investigate the hydrodynamic characteristics of the model. All the types were designed to reduce significantly the air drag chargeable to the main step. The configuration that combined the best stability with a good aerodynamic form consisted of a shallow step and an adjoining ventilation aperture having an area about 7 percent of the square of the beam" (p. 1).
Date: April 1945
Creator: Benson, James M. & Havens, Robert F.
Partner: UNT Libraries Government Documents Department

Spray Characteristics and Take-Off and Landing Stability of Several Modifications of a 1/8-Size Model of the PBN-1 Flying Boat - NACA Model 192

Description: Report discussing tests on the PBN-1 airplane to determine the effects of modifications on spray characteristics and take-off and landing stability. Spray strips were found to reduce the spray over the bow at low speeds. The effects of changing the main step location and altering the elevator position are described.
Date: April 1945
Creator: Woodward, David R. & Zeck, Howard
Partner: UNT Libraries Government Documents Department