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An air-flow-direction pickup suitable for telemetering use on pilotless aircraft

Description: A vane-type air-flow-direction pickup is described which is suitable for telemetering angle-of-attack and angle-of-sideslip data from rocket-propelled pilotless aircraft models. Test results which are presented show that the device performs well under high accelerations and is stable throughout a Mach number rage from subsonic to above a Mach number of 2.5.
Date: October 1956
Creator: Ikard, Wallace L.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Amplitude of supersonic diffuser flow pulsations

Description: From Introduction: "This report, prepared at the NACA Lewis laboratory, presents a theoretical evaluation of the variables which govern pulsation amplitude for the cold-flow engine."
Date: October 1955
Creator: Sterbentz, William H & Davids, Joseph
Item Type: Report
Partner: UNT Libraries Government Documents Department

Analogy Between Mass and Heat Transfer with Turbulent Flow

Description: From Introduction: "The purpose of this paper is to present an analysis of the mass- and heat-transfer process in terms of a simplified physical picture of the turbulent boundary layer subject to the assumptions previously described."
Date: October 1953
Creator: Callaghan, Edmund E.
Item Type: Report
Partner: UNT Libraries Government Documents Department

An analysis of airspeed, altitude, and acceleration data obtained from a twin-engine transport airplane operated over a feeder-line route in the Rocky Mountains

Description: Time-history data of airspeed, altitude, and acceleration obtained with the NACA VGH recorder from a twin-engine airplane operated by a regional feeder airline in the Rocky Mountains are evaluated to determine the magnitude and frequency of occurrence of gusts and gust accelerations and the operating airspeeds and altitudes. The results obtained are compared with the results previously obtained from a representative short-haul and long-haul operation.
Date: October 1, 1956
Creator: Copp, Martin R & Fetner, Mary W
Item Type: Report
Partner: UNT Libraries Government Documents Department

An analysis of base pressure at supersonic velocities and comparison with experiment

Description: In the first part of the investigation an analysis is made of the base pressure in an inviscid fluid, both for two-dimensional and axially-symmetric flow. It is shown that for two-dimensional flow, and also for the flow over a body of revolution with a cylindrical sting attached to the base, there are an infinite number of possible solutions satisfying all necessary boundary conditions at any given free-stream Mach number. For the particular case of a body having no sting attached only one solution is possible in an inviscid flow, but it corresponds to zero base drag. Accordingly, it is concluded that a strictly inviscid-fluid theory cannot be satisfactory for practical applications. Since the exact inviscid-fluid does not adequately describe the conditions of a real fluid flow, an approximate semi-empirical theory for base pressure in a viscous fluid is developed in a second part of the investigation. The semi-empirical theory is based partly on inviscid-flow calculations, and is restricted to airfoils and bodies without boattailing. In this theory an attempt is made to allow for the effects of Mach number, Reynolds number, profile shape, and type of boundary-layer flow. The results of some recent experimental measurements of base pressure in two-dimensional and axially-symmetric flow are presented for purposes of comparison. Some experimental results also are presented concerning the support interference effect of a cylindrical sting, and the interference effect of a reflected bow wave on measurements of base pressure in a supersonic wind tunnel.
Date: July 1950
Creator: Chapman, Dean R
Item Type: Report
Partner: UNT Libraries Government Documents Department

Analysis of behavior of simply supported flat plates compressed beyond the buckling load into the plastic range

Description: An analysis is presented of the postbuckling behavior of a simply supported square flat plate with straight edges compressed beyond the buckling load into the plastic range. The method of analysis involves the application of a variational principle of the deformation theory of plasticity in conjunction with computations carried out on a high-speed calculating machine. Numerical results are obtained for several plate proportions and for one material. The results indicate plate strengths greater than those that have been found experimentally on plates that do not satisfy straight-edge conditions. (author).
Date: February 1955
Creator: Mayers, J & Budiansky, Bernard
Item Type: Report
Partner: UNT Libraries Government Documents Department