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Application of Spring Tabs to Elevator Controls

Description: Report presenting equations for calculating the stick-force characteristics obtained with a spring-tab type of elevator control. The main problems encountered in the design of the satisfactory elevator spring tab are to provide stick forces in the desired range, to maintain the force per g sufficiently constant throughout the speed range, to avoid undesirable "feel" of the control in ground handling, and to prevent flutter.
Date: October 1944
Creator: Phillips, William H.
Item Type: Refine your search to only Report
open access

Compressibility Effects on Heat Transfer and Pressure Drop in Smooth Cylindrical Tubes

Description: "An analysis is made to simplify pressure-drop calculations for nonadiabatic and adiabatic friction flow of air in smooth cylindrical tubes when the density changes due to heat transfer and pressure drop are appreciable. Solutions of the equation of motion are obtained by the use of Reynolds' analogy between heat transfer and skin friction. Charts of the solutions are presented for making pressure-drop calculations" (p. 1).
Date: October 1944
Creator: Nielsen, Jack N.
Item Type: Refine your search to only Report
open access

Detail Calculations of the Estimated Shift in Stick-Fixed Neutral Point Due to the Windmilling Propeller and to the Fuselage of the Republic XF-12 Airplane

Description: "Detail calculations are presented of the shifts in stick-fixed neutral point of the Republic XF-12 airplane due to the windmilling propellers and to the fuselage. The results of these calculations differ somewhat from those previously made for this airplane by Republic Aviation Corporation personnel under the direction of Langley flight division personnel. Due to these differences the neutral point for the airplane is predicted to be 37.8 percent mean aerodynamic chord, instead of 40.8 percent… more
Date: October 16, 1944
Creator: White, M. D.
Item Type: Refine your search to only Report
open access

Determination of desirable lengths of Z- and channel-section columns for local-instability tests

Description: From Summary: "Local-instability tests of 24S-T aluminum-alloy formed Z- and channel-section columns were made in order to determine a length of test specimen that would avoid the increased strength associated with short lengths and also permit the occurrence of a convenient buckling pattern. The effect of column length on the critical compressive stress, on the average stress at maximum load, and on the number of half-waves of the buckling pattern is shown."
Date: October 1944
Creator: Heimerl, George J. & Roy, J. Albert
Item Type: Refine your search to only Report
open access

Ditching tests with a 1/11-size model of the Army B-25 airplane in NACA tank number 2 and on an outdoor catapult

Description: Report presenting testing to determine the best way to land the B-25 airplane in calm and rough water and to determine its probable ditching performance. By landing with flaps down in a tail-down attitude at as slow a speed as possible, smooth straight landing runs will probably result in calm water. Results regarding the effect of attitude, effect of flap setting, effect of simulated damage, effect of propellers, and effect of seaway are provided.
Date: October 1944
Creator: Jarvis, George A. & Steiner, Margaret F.
Item Type: Refine your search to only Report
open access

Dynamic Loads on Airplane Structures During Landing

Description: Report presenting the application of transient theory to the rational determination of dynamic loads on airplane structures during initial landing impact. Simplified procedures are described by which the distribution of the maximum attainable value of the dynamic stresses in the structure may be obtained.
Date: October 1944
Creator: Biot, M. A. & Bisplinghoff, R. L.
Item Type: Refine your search to only Report
open access

The Effect of Compression Ratio on Knock Limits of High-Performance Fuels in a CFR Engine 1: Blends of Triptane and 28-R Fuel

Description: Report discussing the knock-limited performance of blends of triptane and 28-R fuel in an F-4 engine at three sets of conditions and three compression ratios. The knock limits of the triptane blends were more sensitive to compression ratio than the 28-R fuel, and the sensitivities of the blends increased as the severity of other engine conditions increased.
Date: October 1944
Creator: Alquist, Henry E. & Tower, Leonard K.
Item Type: Refine your search to only Report
open access

The Effect of Engine Conditions on the Lead Susceptibility of Paraffinic Fuels

Description: Report presenting an investigation made on a supercharged CFR engine to determine a method for estimating lead susceptibilities of pure or blended paraffinic fuels. As a result of these studies, a chart consisting of a series of straight lines passing through the origin was developed to represent the lead susceptibilities of pure and blended paraffinic fuels in terms of knock-limited indicated mean effective pressures and octane numbers.
Date: October 1944
Creator: Barnett, Henry C. & Imming, Harry S.
Item Type: Refine your search to only Report
open access

Effect of hinge-moment parameters on elevator stick forces in rapid maneuvers

Description: "The importance of the stick force per unit normal acceleration as a criterion of longitudinal stability and the critical dependence of this gradient on elevator hinge-moment parameters have been shown in previous reports. The present report continues the investigation with special reference to transient effects for maneuvers of short duration" (p. 449).
Date: October 12, 1944
Creator: Jones, Robert T. & Greenberg, Harry
Item Type: Refine your search to only Report
open access

Experimental Studies of the Knock-Limited Blending Characteristics of Aviation Fuels 1: Preliminary Tests in an Air-Cooled Cylinder

Description: Report presenting an investigation of the relation between the knock limit and the blend composition of aviation fuels when tested under supercharged conditions in an air-cooled aircraft-engine cylinder. Results regarding the blending characteristics of two gasolines, paraffinic fuels, olefinic fuel, naphthenic fuel, aromatic fuels, when xylidines are present in the fuel components, and fuel components containing unequal concentrations of tetraethyl lead are provided.
Date: October 1944
Creator: Sanders, Newell D.; Hensley, Reece V. & Breitwieser, Roland
Item Type: Refine your search to only Report
open access

Exposures exceeding tolerance

Description: This letter was written in 1944 and applies to the amount of radiation a person could be subjected to under emergency, wartime conditions. Mr. Stone recommends to Dr. Norwood that no man should be ordered to expose himself to more than a tolerance dose (0.1r in a 24 hr period) except in the case of an extreme emergency in which time is of the essence. And that before any man is asked to exceed tolerance that a radiation trained physician be called in for consultation. His recommendations to sai… more
Date: October 25, 1944
Creator: Stone, R. S.
Item Type: Refine your search to only Report
open access

Flight tests of a pursuit airplane fitted with an experimental bellows-type bob weight

Description: Report presenting flight tests to determine the longitudinal stability characteristics of a pursuit airplane when flown with and without an experimental bellows-type bob weight. When the weight was installed, the stick-free static stability remained approximately constant irrespective of the shift in center of gravity resulting from a change in fuel quantity in the auxiliary fuselage fuel tank. Although the weight functioned satisfactorily, the performance could have been enhanced by the reduct… more
Date: October 1944
Creator: Spreiter, John R. & Nissen, James M.
Item Type: Refine your search to only Report
open access

Fluid de-icing tests on a Chandler-Evans 1900 CPB-3 carburetor mounted on a Pratt & Whitney R-1830-C4 intermediate rear engine section

Description: Report presenting an investigation of the icing and de-icing characteristics of a Pratt & Whitney R-1830 engine induction system. The current report covers a program to determine the most effective rate and method of injection of de-icing fluid to remove a heavy ice formation from the induction system. Results regarding the flow rates, recovery times, de-icing portions of the runs, and ice formation characteristics are provided.
Date: October 1944
Creator: Galvin, Herman B. & Essex, Henry A.
Item Type: Refine your search to only Report
open access

Full-Scale Wind-Tunnel Investigation of Forward Underslung Cooling-Air Ducts

Description: Report presenting an investigation of underslung cooling-air ducts in various locations on a model of a typical single-engine tractor airplane in the full-scale tunnel. The report contains the results of tests of two forward underslung ducts. Results regarding pressure recoveries at the radiator, pressures behind the radiator, drag and duct efficiency, and critical speeds are provided.
Date: October 1944
Creator: Nelson, W. J.; Czarnecki, K. R. & Harrington, Robert D.
Item Type: Refine your search to only Report
open access

H-Metal Lined Sphere

Description: The problem of lining a hollow aluminum sphere, 10 inches i.d., with lunes of heavy metal foil, was assigned to this group by Dr. E. Creutz. The work was carried out under the direct supervision of Dr. D.H. Gurinsky. the problem was divided naturally into tow parts: first, forming fitting the lunes, and second, cementing hem to the inside of the sphere.
Date: October 10, 1944
Creator: Young, Dwight S.
Item Type: Refine your search to only Report
open access

Hanford Engineer Works, technical progress letter number 15, October 13 through October 19, 1944

Description: This report documents the progress made for the week in each of the following areas: fuel canning operations; reactor operations (100 area); instrumentation development; and fuel reprocessing (200 area). Detailed information is given for each of these areas. Problems encountered are also discussed.
Date: October 21, 1944
Creator: Bugbee, S. J.
Item Type: Refine your search to only Report
open access

Heat Transfer in a Turbulent Liquid or Gas Stream

Description: "The theory of heat.transfer from a solid body to a liquid stream could he presented previously only with limiting assumptions about the movement of the fluid (potential flow, laminar frictional flow). (See references 1, 2, and 3). For turbulent flow, the most important practical case, the previous theoretical considerations did not go beyond dimensionless formulas and certain conclusions as to the analogy between the friction factor and the unit thermal conductance, (See references 4, 5, 6, an… more
Date: October 1944
Creator: Latzko, H.
Item Type: Refine your search to only Report
open access

The Hydrodynamic Lubrication of Near-Infinite Sliders Such as Piston Rings

Description: "The lubrication of a piston ring is treated as though the ring were a rigid slider of finite width. An expression is obtained for pressure distribution which takes into account the effect of oil leakage from the ends of the ring and which has the convenient form of an end correction to the pressure-distribution formula for an infinite slider. The important formulas are summarized for convenience and two examples are included of their use in finding the pressure pattern over wide sliders" (p. 1… more
Date: October 1944
Creator: Boegli, Charles P.
Item Type: Refine your search to only Report
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