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Correlation of exhaust-valve temperatures with engine operating conditions and valve design

Description: Report presenting a theory regarding engine-cooling variables from a previous report, which was used as a basis for the development of a semi-empirical equation to correlate exhaust-valve temperature with engine conditions. Results regarding the determination of constants, influences of operating variables on mean effective gas temperatures, thermal-resistance factor, and accuracy of correlating equation are provided.
Date: October 1945
Creator: Zipkin, M. A. & Sanders, J. C.
Item Type: Refine your search to only Report
open access

Stresses at Cut-Outs in Shear Resistant Webs as Determined by the Photoelastic Method

Description: "Stress concentration factors for shear stresses around cut-outs in the webs of beams having shear resistant webs were determined by the photoelastic method. Webs with circular, square, and rectangular cut-outs were tested. The effect of reinforcements around square and circular cut-outs was investigated" (p. 1).
Date: October 1945
Creator: Ruffner, Benjamin F. & Schmidt, Calvin L.
Item Type: Refine your search to only Report
open access

Some Flight Measurements on Pressure Distribution During Tail Buffeting

Description: Report presenting pressure-distribution measurements obtained from the horizontal tail surfaces of the Curtiss P-40K airplane during low-speed pull-ups to abrupt stall in which tail buffeting was experienced. The chordwise load distributions during buffeting are similar to those experienced during angle-of-attack changes. The location of the stall and frequency of stall disturbances are also described.
Date: October 1945
Creator: Boshar, John
Item Type: Refine your search to only Report
open access

Use of Variable-Ratio Geared Tabs to Improve Stick-Force Characteristics in Turning Flight

Description: Report discussing the use of variable-ratio geared tabs with an experimental elevator to improve stick-force characteristics in turning flight. The stick forces with the tabs were found to be satisfactory for a variety of center-of-gravity ranges. The ability of pilots to use the controls is also described.
Date: October 1945
Creator: Kleckner, Harold F.
Item Type: Refine your search to only Report
open access

Flight Investigation of Boundary-Layer and Profile-Drag Characteristics of Smooth Wing Sections of a P-47D Airplane

Description: "In Mach range of 0.25 - 0.69, boundary-layer measurements were made on upper wing surface at 25% semi-span, pressure-distribution measurements made on upper surface at 63% semi-span, and wake surveys made at 63% semi-span. The minimum profile-drag coefficient of 0.0062 was indicated for smooth section at 63% semi-span. Critical mach number was exceeded by 0.04, but no compressibility shocks appeared. In slipstream, boundary layer transition occurred as far back as 20% chord on upper surface at… more
Date: October 1945
Creator: Zalovcik, John A.
Item Type: Refine your search to only Report
open access

Comparison of fixed-stabilizer, adjustable- stabilizer and all-movable horizontal tails

Description: Report presenting an analysis to compare longitudinal stability and control characteristics obtained with a conventional fixed-stabilizer, an adjustable-stabilizer, and an all-movable horizontal tail. The tail-area requirements, control forces required in the critical landing condition, static margin, control-force gradients in a dive recovery, and elevator-free stability are investigated.
Date: October 1945
Creator: Harmon, Sidney M.
Item Type: Refine your search to only Report
open access

Knock-limited power outputs from a CFR engine using internal coolants 2: six aliphatic amines

Description: Report presenting an investigation to determine the knock-limited performance of AN-F-28, Amendment-2, fuel in a DCFR engine when water solutions of the following aliphatic amines were added as internal coolants: monomethylamine, dimethylamine, ethylendiamine, diethylamine, triethylamine, and butylamine. Results regarding the mean effective pressure, indicated specific fuel competition, indicated specific liquid consumption, and knock-limited inlet-air pressure plotted against fuel-air ratio ar… more
Date: October 1945
Creator: Bellman, Donald R.; Moeckel, W. E. & Evvard, John C.
Item Type: Refine your search to only Report
open access

Performance Comparison of Two Deep Inducers as Separate Components and in Combination With an Impeller

Description: Report presenting testing of two deep inducers as separate components and in combination with an impeller as part of an investigation to correlate design requirements of inducers and impellers. Both inducers, when tested as separate components at a speed corresponding to an impeller tip speed of 1000 feet per second, had a peak adiabatic efficiency of approximately 82 percent. Results regarding the inducers as separate components, inducer-impeller units, and a comparison of inducer performance … more
Date: October 1945
Creator: Ritter, William K.; Ginsburg, Ambrose & Beede, William L.
Item Type: Refine your search to only Report
open access

Performance Effect of Fully Shrouding a Centrifugal Supercharger Impeller

Description: Report presenting a program of tests to determine the effect of an integral front shroud on the performance characteristics of a centrifugal supercharger impeller. The impellers tested included a modification of a commercial semishrouded impeller and a fully shrouded impeller, which was the same as the semishrouded one except for an integral front shroud.
Date: October 1945
Creator: Ritter, William K. & Johnsen, Irving A.
Item Type: Refine your search to only Report
open access

Correlation of Exhaust-Valve Temperatures With Engine Operating Conditions and Valve Design in an Air-Cooled Cylinder

Description: "A semiempirical equation correlating exhaust-valve temperatures with engine operating conditions and exhaust-valve design has been developed. The correlation is based on the theory correlating engine and cooling variables developed in a previous NACA report. In addition to the parameters ordinarily used in the correlating equation, a term is included in the equation that is a measure of the resistance of the complex heat-flow paths between the crown of the exhaust valve and a point on the outs… more
Date: October 1945
Creator: Zipkin, M. A. & Sanders, J. C.
Item Type: Refine your search to only Report
open access

Summary report on the high-speed characteristics of six model wings having NACA 65(sub1)-series sections

Description: A summary of the results of wind-tunnel tests to determine the high-speed aerodynamic characteristics of six model wings having NACA 65sub1-series sections is presented in this report. The 8-percent-thick wings were superior to the 10-percent and 12-percent-thick wings from the standpoint of power economy during level flight for Mach numbers above 0.76. However, airplanes that are to fly at Mach numbers below 0.76 will gain aerodynamically if the percentage thickness of the wing and the aspect … more
Date: October 19, 1945
Creator: Hamilton, William T. & Nelson, Warren H.
Item Type: Refine your search to only Report
open access

Comparison of several methods of predicting the pressure loss at altitude across a baffled aircraft-engine cylinder

Description: Several methods of predicting the compressible-flow pressure loss across a baffled aircraft-engine cylinder were analytically related and were experimentally investigated on a typical air-cooled aircraft-engine cylinder. Tests with and without heat transfer covered a wide range of cooling-air flows and simulated altitudes from sea level to 40,000 feet. Both the analysis and the test results showed that the method based on the density determined by the static pressure and the stagnation temperat… more
Date: October 9, 1945
Creator: Neustein, Joseph & Schafer, Louis J., Jr.
Item Type: Refine your search to only Report
open access

An Investigation of the Ranger V-770-8 Engine Installation for the Edo XOSE-1 Airplane 2: Aerodynamics

Description: Investigations were made to determine the cowling and cooling characteristics of the Ranger V-770-8 engine installation in an observation seaplane. Final cowl configurations possessed ample engine and oil-cooler pressure drops for cooling in the critical normal-power climb condition with any of the three baffle configurations tested. The indicated critical Mach number of the cowling was found to be 0.70 as determined by the pressure on the lower lip of the inlet.
Date: October 1945
Creator: Dennard, John S. & Nichols, Mark R.
Item Type: Refine your search to only Report
open access

In-Line Aircraft-Engine Bearing Loads 1: Crankpin-Bearing Loads

Description: Report presenting an investigation to develop a general method of determining bearing loads for crankpins. Results regarding the idea design of the bearing, bearing operating temperature, and the calculations for determining ideal operating conditions for V-type engines and production V-type engines are provided.
Date: October 1945
Creator: Shaw, Milton C. & Macks, E. Fred
Item Type: Refine your search to only Report
open access

Cylinder Temperatures of Two Liquid-Cooled Aircraft Cylinders for Various Engine and Coolant Conditions

Description: Report presenting tests conducted with two liquid-cooled cylinders in order to isolate the effects of the various engine and coolant variables on cylinder temperatures and to obtain engine-cooling data required for a fundamental study of the heat-transfer processes in liquid-cooled engines. Cylinder temperatures were obtained for a large range of engine speeds, manifold pressures, carburetor-air temperatures, fuel-air ratios, spark advances, coolant-flow rates, average coolant temperatures, and… more
Date: October 1945
Creator: Manganiello, Eugene J. & Bernardo, Everett
Item Type: Refine your search to only Report
open access

An Investigation of the Ranger V-770-8 Engine Installation for the Edo XOSE-1 Airplane 1: Cooling

Description: Engine temperature data and cooling correlating analyses of the engine and oil cooler are presented in connection with an investigation of the cowling and cooling of the ranger V-770-8 engine installation in the Edo XOSE-1 airplane. Three types of baffles were installed in the course of the tests: the conventional, the turbulent-flow, and the NACA diffuser baffles. Each of the types was of merit in cooling a different region on the cylinder. Incorporation of the best features of the three types… more
Date: October 1945
Creator: Conway, Robert N. & Emmons, M. Arnold, Jr.
Item Type: Refine your search to only Report
open access

Study of the Mixture Distribution of a Double-Row Radial Aircraft Engine

Description: "A test-stand investigation was conducted to determine the mixture distribution of a conventional double-row radial engine for a wide range of engine speeds, powers, and fuel-air ratios and to evaluate its effect on engine performance. The fuel was injected into the combustion-air stream by a rotating spray ring located near the impeller entrance. Fuel-air ratios of the individual cylinders were determined from chemical analyses of the exhaust gas" (p. 1).
Date: October 1945
Creator: Marble, Frank E.; Butze, Helmut F. & Hickel, Robert O.
Item Type: Refine your search to only Report
open access

Thermodynamic Data for the Computation of the Performance of Exhaust-Gas Turbines

Description: "Information published in chemical journals from 1933 to 1939 on the thermodynamic properties of the component gases of exhaust gases based on spectroscopic measurements were used as data for computing the ideal values of work, mass flow, nozzle velocity, power, and temperature change involved in the thermodynamic properties of a gas turbine. Curves from which this information can conveniently be obtained are given. An additional curve is included from which the heat flow may be calculated for … more
Date: October 1945
Creator: Pinkel, Benjamin & Turner, L. Richard
Item Type: Refine your search to only Report
open access

Two-Dimensional Wind-Tunnel Investigation of Six Airfoil Sections for the Wing of the Vega XP2V-1 Airplane

Description: Report discussing testing of six airfoil sections for the wing of the Vega XP2V-1 airplane in a smooth condition and with standard leading-edge roughness. Information about the lift, drag, pitching-moment characteristics, and sensitivity to roughness is provided. No airfoil was found to be superior to the others in all categories.
Date: October 1945
Creator: Fullmer, Felicien F., Jr.
Item Type: Refine your search to only Report
open access

Comparison between calculated and measured loads on wing and horizontal tail in pull-up maneuvers

Description: Report presenting comparisons of measured and calculated loads on the wing and horizontal tail in pull-up maneuvers for six airplanes over a range of weights. Good agreement was obtained between calculated and measured loads under certain circumstances, but the agreement in some cases was only fair, which may be attributed to poor quantitative knowledge of the aerodynamic parameters or to violation of the assumptions on which the method is based.
Date: October 1945
Creator: Matheny, Cloyce E.
Item Type: Refine your search to only Report
open access

Flight tests of two airplanes having moderately high effective dihedral and different directional stability and control characteristics

Description: Report presenting flight tests of a twin-engine midwing attack bomber and a single-engine low-wing fighter, which indicate that both have moderately high effective dihedral but different directional stability and control characteristics. The pilots had a harder time controlling the fighter airplane, while the attack bomber was found to have a higher degree of directional stability and low directional trim forces, which the pilots preferred.
Date: October 1945
Creator: Sjoberg, S. A.
Item Type: Refine your search to only Report
open access

Aerodynamic Characteristics of a 1/8-Scale Powered Model of a High-Speed Bomber With a Dual Pusher Propeller Aft of the Empennage

Description: Report presenting wind-tunnel tests made to determine the aerodynamic characteristics of a scale model of a high-speed bomber with a dual pusher propeller aft of the empennage. Some of the results discussed include longitudinal, lateral, and directional stability and control, the empennage design, and ground effects on the aerodynamic characteristics. The results indicate that this particular airplane has several advantages with regard to stability and control over the conventional-type single-… more
Date: October 12, 1945
Creator: Weiberg, James A. & Schnurbusch, Alfred W.
Item Type: Refine your search to only Report
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