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Effect of an autopilot sensitive to yawing velocity on the lateral stability of a typical high-speed airplane

Description: Report presenting a theoretical investigation to determine the effect on the lateral stability of a typical high-speed fighter airplane of an autopilot sensitive to yawing velocity. The effects of inclination of the gyro spin axis to the flight path and of time lag in the autopilot were also determined. The damping of lateral oscillation of the airplane for all flight conditions studied should satisfy the Air Force-Navy criterion when the proposed autopilot is installed.
Date: September 1951
Creator: Gates, Ordway B., Jr. & Sternfield, Leonard
Item Type: Refine your search to only Report
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Heat Delivery in a Compressible Flow and Applications to Hot-Wire Anemometry

Description: Note presenting the development of a generalized potential theory applicable to nonadiabatic and rotational flow in a two-dimensional field. Three partial differential equations are obtained determining the three variables. which are distribution of additional temperature, velocity perturbation, and an auxiliary function characterizing the rotationality of the flow. Application of the results to hot-wire anemometry are discussed.
Date: August 1951
Creator: Tchen, Chan-Mou
Item Type: Refine your search to only Report
open access

Possible Application of Blade Boundary-Layer Control to Improvement of Design and Off-Design Performance of Axial-Flow Turbomachines

Description: "A theoretical discussion of the application of blade boundary-layer control to increase the efficiency and the stage pressure ratio and to improve off-design performance of turbomachines is presented. A method based on the potential flow of a compressible fluid is developed for designing suction, or ejection, slotted blades having a prescribed velocity distribution along the blade and in the slot. The effect of the boundary layer on the design of the slot and the effect of ejecting gas at stag… more
Date: May 1951
Creator: Sinnette, John T., Jr. & Costello, George R.
Item Type: Refine your search to only Report
open access

Effect of taper ratio on the low-speed rolling stability derivatives of swept and unswept wings of aspect ratio 2.61

Description: Results of tests conducted in the 6-foot-diameter rolling-flow test section of the Langley stability tunnel to determine the effects of varying taper ratio on the rolling and static stability characteristics of a swept wing are presented; results are also given for the effects of varying taper ratio on an unswept wing and for the effects of sweep on a tapered wing. All the models were of aspect ratio 2.61 and had NACA 0012 sections normal to the quarter-chord line. Taper ratios of 1.00, 0.50, a… more
Date: November 1951
Creator: Brewer, Jack D. & Fisher, Lewis R.
Item Type: Refine your search to only Report
open access

An Investigation of the Effects of Jet-Outlet Cut-Off Angle on Thrust Direction and Body Pitching Moment

Description: Note presenting a wind-tunnel investigation to determine the effects of jet-outlet cut-off angle on the directional and spreading characteristics of an unheated, subsonic air jet, and on the pitching moment of the body from which the jet issued. Results regarding the jet operating with the wind tunnel off, jet off with the wind tunnel operating, jet operating with the wind tunnel operating, and flow studies with the jet operating and the wind tunnel off are provided.
Date: June 1951
Creator: Blackaby, James R.
Item Type: Refine your search to only Report
open access

Effect of tail surfaces on the base drag of a body of revolution at Mach numbers of 1.5 and 2.0

Description: "Wind-tunnel tests were performed at Mach numbers of 1.5 and 2.0 to investigate the influence of tail surfaces on the base drag of a body of revolution without boattailing and having a turbulent boundary layer. The tail surfaces were of rectangular plan form of aspect ratio 2.33 and has symmetrical, circular-arc airfoil section. The results of the investigation showed that the addition of these tail surfaces with the trailing edges at or near the body base incurred a large increase in the base-… more
Date: April 1951
Creator: Spahr, J. Richard & Dickey, Robert R.
Item Type: Refine your search to only Report
open access

Practical Methods of Calculation Involved in the Experimental Study of an Autopilot and the Autopilot-Aircraft Combination

Description: Report presenting practical methods for making the calculations required for the analysis of an autopilot and an autopilot-aircraft combination from frequency-response data. From Summary: "Equations are derived for determining the servo-system error voltage for both displacement input signal and displacement plus rate of displacement input signals, the autopilot frequency response for addition of rate of displacement input signal, the servo-system frequency response for a change of gain, and th… more
Date: June 1951
Creator: Smaus, Louis H. & Stewart, Elwood C.
Item Type: Refine your search to only Report
open access

Charts and tables for use in calculations of downwash of wings of arbitrary plan form

Description: From Summary: "Values of the downwash of a horseshoe vortex in compressible flow are presented in the form of charts and tables. The use of the charts and tables in the calculations of the downwash of wings of arbitrary plan form is discussed. The results of a few calculations are compared with experimental results."
Date: May 1951
Creator: Diederich, Franklin W.
Item Type: Refine your search to only Report
open access

A numerical approach to the instability problem of monocoque cylinders

Description: Report presenting two closely related methods which employ operations tables that have been developed and used in the calculation of buckling load of a monocoque cylinder subjected to pure bending. The buckling loads of three cylinders with very different characteristics were calculated using the methods.
Date: April 1951
Creator: Boley, Bruno A.; Kempner, Joseph & Mayers, J.
Item Type: Refine your search to only Report
open access

Method for calculation of ram-jet performance

Description: Report presenting a method utilizing precalculated solutions graphically presented for calculating subsonic or supersonic ramjet performance parameters with the associated equations and graphs. By assuming constant values of specific-heat ratio and gas constant equal to those of standard air, the thrust-coefficient calculation has been reduced to a few simple operations.
Date: June 1951
Creator: Henry, John R. & Bennett, J. Buel
Item Type: Refine your search to only Report
open access

Floating characteristics of a plain and a horn-balanced rudder at spinning attitudes as determined from rotary tests on a model of a typical low-wing personal-owner airplane

Description: Report presenting an investigation to determine the floating characteristics of full-length plain and horn-balanced rudders during rotary tests at spinning attitudes on a scale model of a typical low-wing personal-owner airplane. The investigation included the determination of the effects of the horizontal tail and the wing on the rudder floating characteristics.
Date: May 1951
Creator: Bihrle, William, Jr.
Item Type: Refine your search to only Report
open access

Turbulence-Intensity Measurements in a Jet of Air Issuing From a Long Tube

Description: Report presenting data for turbulent-velocity-fluctuation components and mean-velocity distributions measured in the subsonic jet issuing from a pipe in which a fully developed turbulent flow was established. Axial and radial components of the fluctuation velocities were examined as functions of Reynolds number and position in the jet.
Date: May 1951
Creator: Little, Barney H., Jr. & Wilbur, Stafford W.
Item Type: Refine your search to only Report
open access

Torsional Strength of Stiffened D-Tubes

Description: "The present report covers a series of torsional tests on stiffened D-tubes of alclad 24S-T3 aluminum alloy having a cross section similar to the NACA 0012 airfoil section and a closing web at 30 percent of the chord. The stiffeners consisted of ribs and stringers. An average-strength chart has been developed for this type of structure that takes into account the skin thickness, rib spacing, and stringer spacing. This chart may also be used for unstiffened D-tubes" (p. 1).
Date: May 1951
Creator: Kavanaugh, E. S. & Drinkwater, W. D.
Item Type: Refine your search to only Report
open access

On the Application of Mathieu Functions in the Theory of Subsonic Compressible Flow Past Oscillating Airfoils

Description: Note presenting an account of explicit solutions in terms of Mathieu functions of the problem of two-dimensional subsonic compressible flow past oscillating airfoils. The results are applied to the calculation of three-dimensional corrections for the two-dimensional theory and the effect of the incorporation of the three-dimensional effects on the Mathieu function solution of the two-dimensional problem is shown.
Date: May 1951
Creator: Reissner, Eric
Item Type: Refine your search to only Report
open access

On Two-Dimensional Flow After a Curved Stationary Shock (With Special Reference to the Problem of Detached Shock Waves)

Description: Note presenting an analysis of the problem of two-dimensional flow behind a curved stationary shock wave. The method assumes a given shock-wave shape, which automatically determines certain initial conditions on flow variables, and flow-pattern, including any body shape, follows from initial conditions.
Date: May 1951
Creator: Shu, S. S.
Item Type: Refine your search to only Report
open access

Effectiveness of Ceramic Coatings in Reducing Corrosion of Five Heat-Resistant Alloys by Lead-Bromide Vapors

Description: Note presenting testing to determine whether lead compounds in the combustion products of high-octane fuel are a contributing factor in causing failures of the heat-resistant alloy parts in aircraft exhaust systems. To obtain answers for five heat-resistant alloys, a test was devised in which the alloy specimens in an uncoated condition, in a preoxidized condition, and with three different ceramic coatings were exposed for 6 hours to lead-containing vapors in an air atmosphere at 3 different te… more
Date: June 1951
Creator: Moore, Dwight G. & Mason, Mary A.
Item Type: Refine your search to only Report
open access

Application of the Von Kármán momentum theorem to turbulent boundary layers

Description: Report presenting a study of the Von Kármán momentum theorum with respect to its application to turbulent boundary layers in a positive pressure gradient. The results indicate that the streamwise derivative of the turbulent longitudinal momentum may be large near the separation and therefore should be considered when the momentum theorum is used for turbulent boundary layers near separation.
Date: December 1951
Creator: Bidwell, Jerold M.
Item Type: Refine your search to only Report
open access

Rotogenerative Detection of Corrosion Currents

Description: Note presenting a new technique for studying corrosion phenomena. The method permits the detection of the presence of currents produced by local cells on the surface of a corroding metal specimen. The method can be applied to the study of stress corrosion; in this case a hollow specimen if subjected to sufficient hydraulic pressure to produce the desired stress level.
Date: November 1951
Creator: McAndrew, Joseph B.; Colner, William H. & Francis, Howard T.
Item Type: Refine your search to only Report
open access

An investigation of aircraft heaters 38: determination of thermal performance of rectangular- and trapezoidal-shaped inner-skin passages for anti-icing systems

Description: Report presenting the results of an experimental determination of the thermal and hydrodynamic behavior of air in the downstream portion of two types of double-skin passages used in heated-air leading-edge anti-icing systems. Results regarding heat transfer and pressure drop are provided.
Date: November 1951
Creator: Boelter, L. M. K.; Sanders, V. D. & Romie, F. E.
Item Type: Refine your search to only Report
open access

The effect of rate of change of angle of attack on the maximum lift coefficient of a pursuit airplane

Description: Report presenting a study of the effect of rate of change of angle of attack on the maximum lift coefficient of a pursuit airplane equipped with a low-drag-type wing in stalls of varying abruptness over a range of Mach and Reynolds numbers. Maximum lift coefficients were found to increase linearly with increasing rate of change of angle of attack per chord length of travel up to the maximum rate attained in the tests.
Date: October 1951
Creator: Gadeberg, Burnett L.
Item Type: Refine your search to only Report
open access

Method for determining pressure drop of monatomic gases flowing in turbulent motion through constant-area passages with simultaneous friction and heat addition

Description: Report presenting charts that enable convenient determination of the pressure drop sustained by monatomic gases flowing at high subsonic speeds in a constant-area passage under the simultaneous influence of friction and heat addition. Pressure drops are determinable with good accuracy for other modes of heat addition using an effective wall temperature in conjunction with the charts. The effective wall temperature is given in terms of the passage dimensions, gas-flow conditions, and gas-tempera… more
Date: April 1951
Creator: Valerino, Michael F. & Doyle, Ronald B.
Item Type: Refine your search to only Report
open access

A rapid approximate method for determining velocity distribution on impeller blades of centrifugal compressors

Description: Report presenting the development of a rapid approximate method of analysis for both compressible and incompressible, nonviscous flow through radial- or mixed-flow centrifugal compressors with arbitrary hub and shroud contours and arbitrary blade shape. The method is used with eight numerical examples for two-dimensional flow, covering a wide range of flow rate, impeller-tip speed, number of blades, and blade curvature.
Date: July 1951
Creator: Stanitz, John D. & Prian, Vasily D.
Item Type: Refine your search to only Report
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