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 Decade: 1940-1949
 Year: 1947
 Collection: National Advisory Committee for Aeronautics Collection
Wind-Tunnel Tests of the 1/25-Scale Powered Model of the Martin JRM-1 Airplane. IV - Tests with Ground Board and with Modified Wing and Hull - TED No. NACA 232, Part 4, Tests with Ground Board and with Modified Wing and Hull, TED No. NACA 232

Wind-Tunnel Tests of the 1/25-Scale Powered Model of the Martin JRM-1 Airplane. IV - Tests with Ground Board and with Modified Wing and Hull - TED No. NACA 232, Part 4, Tests with Ground Board and with Modified Wing and Hull, TED No. NACA 232

Date: September 4, 1947
Creator: Lockwood, Vernard E.
Description: Wind-tunnel tests were made of a 1/25 scale model of the Martin JRM-1 airplane to determine: (1) The longitudinal stability and control characteristics of the JRM-1 model near the water and lateral and directional stability characteristics with power while moving on the surface of the water, the latter being useful for the design of tip floats; (2) The stability and stalling characteristics of the wing with a modified airfoil contour; (3) Stability characteristics of a hull of larger design gross weight; The test results indicated that the elevator was powerful enough to trim the original model in a landing configuration at any lift coefficient within the specified range of centers of gravity. The ground-board tests for evaluating the aerodynamic forces and moments on an airplane in a simulated cross wind indicate a high dihedral effect in the presence of the ground board and, consequently, during low-speed taxying and take-off, large overturning moments would result which would have to be overcome by the tip floats.
Contributing Partner: UNT Libraries Government Documents Department
Wing-flow tests of a triangular wing of aspect ratio two I : effectiveness of several types of trailing-edge flaps on flat-plate models

Wing-flow tests of a triangular wing of aspect ratio two I : effectiveness of several types of trailing-edge flaps on flat-plate models

Date: November 14, 1947
Creator: Rathert, George A , Jr
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Wing plan forms for high-speed flight

Wing plan forms for high-speed flight

Date: January 1, 1947
Creator: Jones, Robert J
Description: It is pointed out that, in the case of an airfoil of infinite aspect ratio moving at an angle of sideslip, the pressure distribution is determined solely by that component of the motion in a direction normal to the leading edge. It follows that the attachment of plane waves to the airfoil at near-sonic or supersonic speeds (Ackeret theory) may be avoided and the pressure drag may be reduced by the use of plan forms in which the angle of sweepback is greater than the Mach angle. The analysis indicates that for aerodynamic efficiency, wings designed for flight at supersonic speeds should be swept back at an angle greater than the Mach angle, and the angle of sweepback should be such that the component of velocity normal to the leading edge is less than the critical speed of the airfoil sections. This principle may also be applied to wings designed for subsonic speeds near the speed of sound, for which the induced velocities resulting from the thickness might otherwise be sufficiently great to cause shock waves.
Contributing Partner: UNT Libraries Government Documents Department
Wing pressure-distribution measurements up to 0.866 Mach number in flight on a jet-propelled airplane

Wing pressure-distribution measurements up to 0.866 Mach number in flight on a jet-propelled airplane

Date: March 1, 1947
Creator: Brown, Harvey H
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Yaw characteristics and sidewash angles of a 42 degree sweptback circular-arc wing with a fuselage and with leading-edge and split flaps at a Reynolds number of 5,300,000

Yaw characteristics and sidewash angles of a 42 degree sweptback circular-arc wing with a fuselage and with leading-edge and split flaps at a Reynolds number of 5,300,000

Date: December 10, 1947
Creator: Salmi, Reino J
Description: None
Contributing Partner: UNT Libraries Government Documents Department
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