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Technical Report Archive and Image Library
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National Advisory Committee for Aeronautics Collection
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19
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13
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6
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5
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NACA Wartime Reports
26
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12
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5
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78 Matching Results
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An Experimental Investigation of Several Low-Drag Wing-Nacelle Combinations with Internal Air Flow
From Summary: "The results of an experimental investigation of several low-drag wing-nacelle combinations, incorporating internal air-flow systems, are presented. The external-drag increments due to these nacelles are between one-half and two-thirds of those of conventional nacelle forms. This improvement is accomplished with only minor effects on the lift and moment characteristics of the wing. The procedure employed to determine the external shape of such low-drag nacelles is considered in detail. The design of an efficient internal-flow system with or without a blower or throttle, presents no serious problems. The energy losses in the expansion before the engine and the contraction thereafter can be kept small. It is believed that these nacelles have a wide application in housing engine pusher-propeller units and, with some alteration, jet-propulsion devices. It is probable that the low external drags may not be realized if such nacelles are used with a tractor propeller because of the high level of turbulence in the propeller slipstream."
Date:
March 1945
Creator:
Allen, H. Julian; Frick, Charles W. & Erickson, Myles D.
Object Type:
Report
System:
The UNT Digital Library
An Estimate of the Effect of Engine Supercharging on the Take-Off Thrust of a Typical Helicopter at Different Altitudes and Temperatures
Report discussing the effects of supercharging on the take-off thrust and useful load for a typical helicopter. Performance of the engine with the supercharger and on the rotor thrust is detailed.
Date:
March 1945
Creator:
Bailey, F. J., Jr. & Voglewede, T. J.
Object Type:
Report
System:
The UNT Digital Library
World Survey of Tantalum Ore
Report issued by the U.S. Bureau of Mines discussing the occurrences of tantalum in different areas of the world. The tantalum deposits are described in reference to each individual country that it is found in. This report includes maps, tables, and illustrations.
Date:
March 1945
Creator:
Baker, James S.
Object Type:
Report
System:
The UNT Digital Library
On a Method of Constructing Two-Dimensional Subsonic Compressible Flows Around Closed Profiles
Note showing that under certain conditions, a two-dimensional subsonic compressible flow around an airfoil profile can be derived from an incompressible flow around another profile. The connection between the two "conjugate flows" is given by a simple conformal transformation of the respective hodograph planes.
Date:
March 1945
Creator:
Bers, Lipman
Object Type:
Report
System:
The UNT Digital Library
Tensile-Strength Investigation of Cast-Iron Piston Rings of Various Strengths
Report discusses an investigation into the tensile strength of cast-iron piston rings, NACA microtensile specimens, and bar specimens. Photographs showing the relation between graphite-flake size and tensile strength and radiographs showing the shrinkage cavities in the piston rings are provided. Piston rings tend to be one of the first parts of an aircraft engine to fail, so discovering the ideal material composition and foundry treatment is very important.
Date:
March 1945
Creator:
Bisson, Edmond E. & Kessler, Harold D.
Object Type:
Report
System:
The UNT Digital Library
Annual Report of the Boy Scouts of America: 1944
Annual report submitted by the Boy Scouts of America to Congress describing highlights from 1944 activities, organizational leadership, and other information about scouting programs.
Date:
March 27, 1945
Creator:
Boy Scouts of America
Object Type:
Report
System:
The Portal to Texas History
Factors Affecting the Precipitation of Tubanyl Peroxide from Gunk Solutions at Reduced Temperatures
This paper reports work carried out to determine the factors necessary to give a filterable precipitation and determine the effects of these factors on the quantitativeness of the precipitation, and how any tendency to increase the tuballoy solubility may be overcome.
Date:
March 26, 1945
Creator:
Brown, K. B.; Davis, W. C.; Wagner, E. L. & Miller, A. J.
Object Type:
Report
System:
The UNT Digital Library
Factors Affecting the Precipitation of Tubanyl Peroxide from Gunk Solutions at Reduced Temperatures
The following report presents data from the investigations on discovering factors affecting the precipitation of tubanyl peroxide from Alpha and Beta gunk solutions at reduced temperatures.
Date:
March 6, 1945
Creator:
Brown, K. B.; Swanson, D. M.; Wagner, E. L. & Miller, A. J.
Object Type:
Report
System:
The UNT Digital Library
Metallurgical Laboratory, Chemical Research - Radiation Chemistry, Report for the Month Ending March 15, 1945
Technical report with short reports on (1) Effect of radiation on water and aqueous systems; (2) Gas evolution from uranyl solutions; (3) Effect of radiation on solid compounds; (4) Instruments; and (5) Scattering.
Date:
March 15, 1945
Creator:
Burton, Milton, 1902- & Allen, A. O. (Augustine O.)
Object Type:
Report
System:
The UNT Digital Library
Investigation of Slipstream Effects on a Wing-Inlet Oil-Cooler Ducting System of a Twin-Engine Airplane in the Ames 40- by 80-Foot Wind Tunnel
Report discussing an investigation of wing-inlet oil-cooler ducts on a twin-engine airplane to determine internal and external-flow characteristics of the ducting installation. Testing was also performed on revised inlets to attempt to develop a ducting system with low overall losses throughout the operating range.
Date:
March 10, 1945
Creator:
Chapman, Dean R.
Object Type:
Report
System:
The UNT Digital Library
Ultraviolet spectrochemical analysis for aromatics in aircraft fuels
Report presenting tests to verify and extend ultraviolet spectroscopic techniques for applications to the analysis of aviation fuels for their aromatic constituents. Results regarding photographic absorption spectra, spectrophotometric absorption spectra, and spectrophotometric analyses are provided.
Date:
March 1945
Creator:
Cleaves, Alden P.
Object Type:
Report
System:
The UNT Digital Library
Eliminating The Wesel Pocket
Map of eliminating the wesel pocket 3-11 march 1945.
Date:
March 1945
Creator:
DeFrance D.L.
Object Type:
Map
System:
The UNT Digital Library
High-Speed Photographs of a YR-4B Production Rotor Blade for Simulated Flight Conditions in the Langley Full-Scale Tunnel
Report discussing tests of a Sikorsky YR-4B helicopter, including photography of a rotor blade in forward-flight conditions at several azimuth angles for several tip-speed ratios. Fabric deformation in the form of sagging and bulging was noted. A reversal in the bending curve near the blade tip was also noted, which was hypothesized to come from losses of lift and high centrifugal force.
Date:
March 1945
Creator:
Dingeldein, Richard C. & Schaefer, Raymond F.
Object Type:
Report
System:
The UNT Digital Library
Operating Stresses in Aircraft-Engine Crankshafts and Connecting Rods 1: Slip-Ring and Bush Combinations for Dynamic-Strain Measurements
"Tests were conducted to develop a slip-ring and brush system that will perform satisfactorily in aircraft-engine, dynamic-strain-measuring applications where resistance-wire strain gages are the means of measuring the strain and to correlate the data obtained from tests in order to provide a basis for predicting the performance of similar slip-ring and brush systems operating under conditions similar to those imposed by these tests." 24 combinations of materials were tested dry and 8 were tested in oil. The five most predictable systems were identified.
Date:
March 30, 1945
Creator:
Dutee, Francis J.; Phillips, Franklyn W. & Kemp, Richard H.
Object Type:
Report
System:
The UNT Digital Library
Technical Department report on Production Test No. 313-60-M: Study of coolants used for machining heavy metal slugs
None
Date:
March 27, 1945
Creator:
Eubank, L. D.
Object Type:
Report
System:
The UNT Digital Library
METALLURGY DIVISION PROGRESS REPORT FOR MARCH 17 TO MARCH 24, 1945
None
Date:
March 24, 1945
Creator:
Foote, F.; Brugmann, E. W. & Chapin, J. H.
Object Type:
Report
System:
The UNT Digital Library
PROGRESS REPORT March 10 to March 17, 1945
None
Date:
March 17, 1945
Creator:
Foote, F.; Brugmann, E. W. & Chapin, J. H.
Object Type:
Report
System:
The UNT Digital Library
A Metallurgical Investigation of a Large Forged Disc of 19-9 DL Alloy
Report presenting an investigation of the properties of a 20-inch diameter by 3.25 inch disc of 19-9 DL alloy in the as-forged and stress-relieved condition. Results regarding the hardness survey, short-time tensile properties, rupture test characteristics, time for deformation characteristics under stress, creep strengths, and stability characteristics are provided.
Date:
March 1945
Creator:
Freeman, J. W.; Reynolds, E. E. & White, A. E.
Object Type:
Report
System:
The UNT Digital Library
The Effect of Modified Baffles and Auxiliary-Cooling Ducts on the Cooling of a Double-Row Radial Engine
Report discussing testing to determine the cooling effect of modified baffles and auxiliary-cooling ducts on the rear-row cylinders of a double-row radial engine. The modified baffles were found to reduce the temperatures of the exhaust-valve seats, but did not have an effect on the valve-guide temperatures. The auxiliary-cooling ducts reduced temperatures of the exhaust-valve seats and rear spark plug gaskets.
Date:
March 20, 1945
Creator:
Gendler, Stanley L. & Geisenheyner, Robert M.
Object Type:
Report
System:
The UNT Digital Library
An Electron and X-Ray Diffraction Investigation of Surface Changes on Nitrided-Steel Piston Rings During Engine Operation in Nitrided-Steel Cylinders Barrels
Report presenting an examination of new and used nitrided-steel piston rings by electron and X-ray diffraction in a study of the surface changes produced during engine operation. Both new and used rings, examined after degreasing, gave an electron-diffraction pattern consisting of diffuse bands: those from used rings fell at the usual positions of the bands from polished metal surfaces.
Date:
March 1945
Creator:
Good, J. N. & Brockway, L. O.
Object Type:
Report
System:
The UNT Digital Library
Characteristics of Several Single- and Dual-Rotating Propellers in Negative Thrust
Report discusses the thrust and power characteristics of several single- and dual-rotating propellers with differing blade width and number of blades for negative-thrust operation from -45 degrees to 145 degrees blade angle. From Summary: "The tests indicate that it is possible to predict for a given propeller design characteristics in the negative-thrust range from known characteristics at a different activity factor. Adequate negative thrusts were indicated for extremely high positive as well as negative blade angles."
Date:
March 1945
Creator:
Gray, W. H. & Gilman, Jean, Jr.
Object Type:
Report
System:
The UNT Digital Library
Technical Department report on Production Test No. 313-62-M: Effect of bar position on seating in the canning of heavy metal slugs
None
Date:
March 21, 1945
Creator:
Grills, R. C.
Object Type:
Report
System:
The UNT Digital Library
Flight Tests of the Sikorsky HNS-1 (Army YR-4B) Helicopter 1: Experimental Data on Level-Flight Performance With Original Rotor Blades
"Results of performance measurements made in level fight with the HNS-1 (Army YR-4B) helicopter are presented. These data include torquemeter measurements of shaft power for both the main rotor and the tail rotor. The power data, in conjunction with full-scale-tunnel date on the lift and drag of the fuselage, are used to calculate the drag-lift ratio for the main rotor" (p. 1).
Date:
March 1945
Creator:
Gustafson, F. B.
Object Type:
Report
System:
The UNT Digital Library
Flight tests of a P-63-1 airplane with an electric torquemeter
Report presenting an electric torquemeter that was used to measure the power of an Allison V-1710-93 engine installed in a Bell P-63A-1 airplane. Results of maximum-available-power tests in flight at a range of density altitudes showed good agreement between the measured maximum power output and the maximum power shown on the engine manufacturer's calibration chart.
Date:
March 1945
Creator:
Hanson, Morgan P.
Object Type:
Report
System:
The UNT Digital Library