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Effect of Countersunk Depth on the Tightness of Two Types of Machine-Countersunk Rivet

Description: Bulletin presenting an investigation conducted to determine the effect of countersunk depth on the tightness of two types of machine-countersunk flush rivet. The specimens tested in the study were simple lap joints made by two different riveting methods. The results indicated that roundheaded rivets inserted from the back of the joint with the countersunk heads formed int he driving of the rivets produce tighter joints over a large range of depths than ordinary flush rivets.
Date: October 1942
Creator: Gottlieb, Robert
Item Type: Refine your search to only Report
open access

The Effect of Cowling Shape on the Stability Characteristics of an Airplane

Description: "Three widely different nose shapes were tested on a fuselage alone and on a complete model in the UACA stability tunnel to investigate the effect of cowling shape on stability characteristics. The results are presented in the form of charts which show the variation in the aerodynamic characteristics with the three nose shapes for the propeller-removed condition over a wide range of angles of attack and yaw. The results of the investigation indicated that large changes in the cowling shape prod… more
Date: September 1942
Creator: Donlan, C. J. & Letko, W.
Item Type: Refine your search to only Report
open access

The effect of dead rise upon the low-angle type of porpoising

Description: Report presenting data pertaining to forces and moments developed by V-bottom planing surfaces of different angles of dead rise in order to compute the effect of dead rise on the lower trim limit of stability on a seaplane. Increase of angle of dead rise in the range of 10 degrees to 30 degrees causes an important increase in the lower limit of stability.
Date: October 1942
Creator: Benson, James M. & Lina, Lindsay J.
Item Type: Refine your search to only Report
open access

The effect of exhaust-stack shape on the design and performance of the individual cylinder exhaust-gas jet-propulsion system

Description: Report presenting tests on a single-cylinder, air-cooled engine to determine the effect of several different exhaust-stack shapes on the design and performance of the individual cylinder exhaust-gas jet-propulsion systems. Results regarding the effect of nozzle area and stack shape on exhaust-gas jet thrust, effect of nozzle area and stack shape on overall performance for the S-shape, the 90 degree bend, and the 180 degree bend, the effect on the shape on engine power and volumetric efficiency,… more
Date: November 1942
Creator: Turner, L. Richard & Humble, Leroy V.
Item Type: Refine your search to only Report
open access

Effect of Ground on Characteristics of Model of a Low-Wing Airplane With Full-Span Slotted Flap With and Without Power

Description: Report presenting ground-effect tests made in the LMAL 7- by 10-foot tunnel of a model of a low-wing, pursuit-type airplane equipped with a full-span 25-percent-chord slotted flap. Testing occurred at different heights and power conditions, and two stabilizer and elevator settings were used at each condition. Results indicated that the elevator deflection required for landing in a three-point attitude with the full-span slotted flap was considerably greater than that required with a partial-spa… more
Date: September 1942
Creator: Recant, I. G. & Wallace, A. R.
Item Type: Refine your search to only Report
open access

Effect of inlet-air velocity distribution on the metering pressure of an injection-type aircraft carburetor

Description: Report presenting tests of a three-barrel pressure carburetor to determine the effect of nonuniformity of the air flow in the intake duct on the metering of the carburetor. Measurements were made in the air side of the metering system and in the carburetor barrels for a variety of flow distributions. Results regarding the metering pressure, altitude compensation, effect of throttle on the metering characteristics, and flow of air around the bends are provided
Date: May 1942
Creator: Kinghorn, George F.
Item Type: Refine your search to only Report
open access

Effect of Normal Pressure on the Critical Compressive Stress of Curved Sheet

Description: Results are presented of tests of two specimens tested to study the effect of normal pressure on the critical compressive stress for thin curved sheets. These specimens are designated by their respective rib spacings of 10 inches and 30 inches. The relationship between compressive stress and normal pressure at which buckles disappeared is independent of whether the buckles were made to disappear by increase of normal pressure or decrease of compressive stress. (author).
Date: August 25, 1942
Creator: Rafel, Norman
Item Type: Refine your search to only Report
open access

The effect of pitch on force and moment characteristics of full-scale propellers of five solidities

Description: Report presenting an investigation in the 20-foot propeller-research tunnel to determine the effect of variations in angle of pitch on the aerodynamic characteristics of several propeller combinations. The combinations investigated included two-, three-, four-, and six-blade single-rotating propellers and a six-blade dual-rotating propeller on a nacelle with four angles of thrust axis. The propulsive efficiency was found to decrease as the angle of pitch increased.
Date: June 1942
Creator: Runckel, Jack F.
Item Type: Refine your search to only Report
open access

The Effect of Propeller Operation on the Air Flow in the Region of the Tail Plane for a Twin-Engine Tractor Monoplane

Description: Report presenting air-flow surveys made in the region of the tail plane of a typical twin-engine tractor monoplane model with tail surfaces removed. The surveys were made with propellers removed and operating and for both cases included the conditions for flaps retracted and flaps deflected 50 degrees.
Date: August 1942
Creator: Sweberg, Harold H.
Item Type: Refine your search to only Report
open access

Effect of rivet and spot-weld spacing on the strength of axially loaded sheet-stringer panels of 24S-T aluminum alloy

Description: Report presenting testing of eighteen 24S-T aluminum alloy sheet-stringer panels in end compression under carefully controlled edge conditions. Results regarding the strains, deflections, failure, and buckling of the sheet are provided.
Date: August 1942
Creator: Levy, Samuel; McPherson, Albert E. & Ramberg, Walter
Item Type: Refine your search to only Report
open access

The Effect of Valve Cooling Upon Maximum Permissible Engine Output as Limited by Knock

Description: "A Wright GR-1820-G200 cylinder was tested over a wide range of fuel-air ratios at maximum permissible power output as limited by knock with three different degrees of valve cooling. The valves used were stock valves (solid inlet valve and hollow sodium-cooled exhaust valve), hollow valves with no coolant, and hollow valves with flowing water as a coolant. Curves showing the variation in maximum permissible values of inlet-air pressure, indicated mean effective pressure, cylinder charge, and in… more
Date: September 1942
Creator: Munger, Maurice; Wilsted, H. D. & Mulcahy, B. A.
Item Type: Refine your search to only Report
open access

The Effect of Various Surface Conditions on Press Fits of Steel Bushings and 17S-T Aluminum-Alloy Fittings

Description: Report presenting testing of specimens of 17S-T aluminum-alloy fittings with pressed-in steel bushings for various surface conditions. The surface conditions tested included bare surfaces, aonidcal coating and steel cadmium-plate, and one surface treated and the other bare, both without lubrication and with Gredag No. 83 as a lubricant. The calculated coefficients of friction for the various press fits for the investigation ranged from 0.33 for the unlubricated contact of bare steel and aluminu… more
Date: December 1942
Creator: Hartmann, E. C. & Reedy, J. F.
Item Type: Refine your search to only Report
open access

Effects of Direction of Propeller Rotation on the Longitudinal Stability of the 1/10-Scale Model of the North American XB-28 Airplane With Flaps Neutral

Description: "The effects of direction of propeller rotation on factors affecting the longitudinal stability of the XB-28 airplane were measured on a 1/10-scale model in the 7- by 10-foot tunnel of the Ames Aeronautical Laboratory. The main effect observed was that caused by regions of high downwash behind the nacelles (power off as well as power on with flaps neutral). The optimum direction of propeller rotation, both propellers rotating up toward the fuselage, shifted this region off the horizontal tail a… more
Date: June 1942
Creator: Delany, Noel K.
Item Type: Refine your search to only Report
open access

Effects of Range of Stress and of Special Notches on Fatigue Properties of Aluminum Alloys Suitable for Airplane Propellers

Description: "Laboratory tests were made to obtain information on the load-resisting properties of X76S-T aluminum alloy when subjected to static, impact, and repeated loads. Results are presented from static-load test of unnotched specimens in tension and in torsion and of notched specimens in tension. Charpy impact values obtained from bend tests on notched specimens and tension impact values for both notched and unnotched specimens tested at several different temperatures are included" (p. 1).
Date: June 1942
Creator: Dolan, Thomas J.
Item Type: Refine your search to only Report
open access

Electrical Equipment for the Experimental Study of the Dynamics of Fluids

Description: "This report contains the description of electric anemometers and their application to the study of turbulent fluid flows, of electric tanks for the realization of the analogies between electrology and aerodynamics and their application to the study of varied technical problems, and lastly of the electric condenser type dynamometer and its application to the prediction of the aerodynamic forces on wing and airplane models in wind-tunnel tests and in controlled and spontaneous rotations" (p. 1).
Date: March 1942
Creator: Ferrari, Carlo
Item Type: Refine your search to only Report
open access

The Electrical Structure of Thunderstorms

Description: "The time histories of thunderstorm charge distribution during three storms occurring during the summer of 1940 in the vicinity of the Albuquerque Airport were investigated by the use of eight synchronized recording electrometers arranged in a particular pattern over a field 1.6 kilometers above sea level. The instruments produced simultaneous records of the changes in the surface potential gradient caused by lightning strokes and each one had a time-resolving power of 0.01 second" (p. 1).
Date: November 1942
Creator: Workman, E. J.; Holzer, R. E. & Pelsor, G. T.
Item Type: Refine your search to only Report
open access

Elevator Stick Forces in Spins as Computed From Wind-Tunnel Measurements

Description: "Data from wind-tunnel measurements of elevator hinge-moment coefficients at high angles of attack are utilized in estimating elevator stick forces in spins. The analysis indicates that elevator forces on several current airplanes will be so high that the pilot will be unable to push the stick to the neutral position. Large nose balances involve danger of the elevator locking in the full-up position" (p. 1).
Date: October 1942
Creator: Seidman, Oscar & Klinar, J. W.
Item Type: Refine your search to only Report

Enemy ears are listening.

Description: The poster depicts Benito Mussolini, Hideki Tojo, and Adolf Hitler. Only one hand and the head of each man is shown. Each has his hand cupped around one ear. On Tojo's hand is a pinky ring and the artist's signature "Iligan" is written on his wrist, with a small inverted black triangle symbol below it.
Date: 1942
Creator: Iligan, Ralph, 1893-1960
Item Type: Refine your search to only Poster
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