1–20 of 37 hits
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    Tests in the NACA two-dimensional low-turbulence tunnel of airfoil sections designed to have small pitching moments and high lift-drag ratios

    Tetervin, Neal | NTRS | 1943
    Keywords: PRESSURE DISTRIBUTION-AIRFOILS-NACA HELICOPTER , AIRFOILS-ROTOR BLADES

    Charts for Estimation of the Characteristics of a Helicopter Rotor in Forward Flight I : Profile Drag-lift Ratio for Untwisted Rectangular Blades

    Gustafson, F B | NTRS | 1944
    Keywords: CHARTS - PROPELLERS, HELICOPTER , AIRFOILS - ROTOR BLADES , ROTOR BLADES - DRAG, PROFILE

    Comparisons of methods of computing bending moments in helicopter rotor blades in the plane of flapping

    Luecker, Arthur R | NTRS | 1945
    Keywords: PROPELLERS, HELICOPTER , ROTOR BLADES - BENDING MOMENTS , ROTOR BLADES - FLAPPING

    Full-scale-tunnel Performance Tests of the PV-2 Helicopter Rotor

    Migotsky, Eugene | NTRS | 1945
    Keywords: PROPELLERS, HELICOPTER - PERFORMANCE , AIRFOILS - NACA 0012 6 ROTOR-BLADE , PROPELLERS, HELICOPTER - P-V ENG FORUM 2

    Response of helicopter rotors to periodic forces

    Kelley, Bartram | NTRS | 1945
    Keywords: ROTOR BLADES, HINGED , PROPELLERS, HELICOPTER - VIBRATION

    Static-Thrust Tests of Six Rotor-Blade Designs on a Helicopter in the Langley Full-Scale Tunnel

    Dingeldein, Richard C. / Schaefer, Raymond F. | NTRS | 1945
    Keywords: PROPELLERS, HELICOPTER - THRUST, STATIC , ROTOR BLADES

    High-speed Photographs of a YR-4B Production Rotor Blade for Simulated Flight Conditions in the Langley Full-scale Tunnel

    Schaefer, Raymond F | NTRS | 1945
    Keywords: PHOTOGRAPHY-ROTOR BLADES HIGH-SPEED , PROPELLERS, HELICOPTER

    Static-thrust Investigation of Full-scale PV-2 Helicopter Rotors Having NACA 0012.6 and 23012.6 Airfoil Sections

    Lipson, Stanley | NTRS | 1946
    Keywords: PROPELLERS, HELICOPTER - THRUST, STATIC , AIRFOILS - NACA 0012 6 ROTOR BLADE , PROPELLERS, HELICOPTER - P-V ENG FORUM 2 , AIRFOILS - NACA 23012 6 ROTOR BLADE

    Aerodynamic Characteristics of Four NACA Airfoil Sections Designed for Helicopter Rotor Blades

    Rice, Fred J , Jr | NTRS | 1946
    Keywords: ROTOR BLADES-DRAG, PROFILE , AIRFOILS-NACA 7-H-12-CHAR , A C , MOMENTS & ORDINATES LOW-DRAG (HELICOPTER) , AIRFOILS-NACA 8-H-12-CHAR , A C , MOMENTS & ORDINATES LOW-DRAG (HELICOPTER) , AIRFOILS-NACA 10-H-12-CHAR , A C , MOMENTS & ORDINATE LOW-DRAG (HELICOPTER) , AIRFOILS-NACA 3-H-13 5-CHARACTERISTICS LOW-DRAG (HELICOPTER) , AIRFOILS-NACA 9-H-12-CHAR , A C , MOMENTS & ORDINATES LOW-DRAG (HELICOPTER)

    Full-scale Investigation of the Aerodynamic Characteristics of a Typical Single-rotor Helicopter in Forward Flight

    Dingeldein, Richard C / Schaefer, Raymond F | NTRS | 1947
    Keywords: ROTOR BLADES , PROPELLERS, HELICOPTER , AIRFOILS - NACA 0012 - HELICOPTER

    Flight Investigation of Effects of Rotor-blade Twist on Helicopter Performance in the High-speed and Vertical-autorotative-descent Conditions

    Gessow, Alfred | NTRS | 1948
    Keywords: AIRFOILS - NACA 23015 HELICOPTER , ROTOR BLADES - TWIST , PROPELLERS, HELICOPTER

    Full-scale Investigation of the Blade Motion of the PV-2 Helicopter Rotor

    Migotsky, Eugene | NTRS | 1948
    Keywords: AIRFOILS - NACA 0012 6 - ROTOR-BLADE , PROPELLERS, HELICOPTER - P-V ENG FORUM 2 , ROTOR BLADES - FLAPPING

    Effect of rotor-blade twist and plan-form taper on helicopter hovering performance

    Gessow, Alfred | NTRS | 1948
    Keywords: ROTOR BLADES - TWIST , PROPELLERS, HELICOPTER

    Response of a helicopter rotor to oscillatory pitch and throttle movements

    Carpenter, Paul J / Peitzer, Herbert E | NTRS | 1949
    Keywords: AIRFOILS - NACA 23015 HELICOPTER , ROTOR BLADES - OSCILLATIONS , ROTOR BLADES, HINGED , HELICOPTER TOWERS - NACA , ROTORS, HELICOPTER

    An analytical study of the steady vertical descent in autorotation of single-rotor helicopters

    Nikolsky, A A / Seckel, Edward | NTRS | 1949
    Keywords: ROTOR BLADES , PROPELLERS, HELICOPTER

    The application of airfoil studies to helicopter rotor design

    Gustafson, F B | NTRS | 1949
    Keywords: AIRFOILS - NACA 8-H-12 - LOW-DRAG (HELICOPTER) , ROTOR BLADES , AIRFOILS - NACA 9-H-12 - LOW-DRAG (HELICOPTER) , AIRFOILS, HELICOPTER , PROPELLERS, HELICOPTER

    Hovering and Low-speed Performance and Control Characteristics of an Aerodynamic-servocontrolled Helicopter Rotor System as Determined on the Langley Helicopter Tower

    Carpenter, Paul J / Paulnock, Russell S | NTRS | 1950
    Keywords: PROPELLERS, HELICOPTER - PERFORMANCE , ROTOR BLADES - TWIST , CONTROLS, HELICOPTER , ROTOR BLADES - PITCH , HELICOPTER TOWERS - NACA

    A theoretical analysis of elastic vibrations of fixed-ended and hinged helicopter blades in hovering and vertical flight

    Morduchow, Morris | NTRS | 1950
    Keywords: ROTOR BLADES - VIBRATION , EQUATIONS - PROPELLERS, HELICOPTER , PROPELLERS, HELICOPTER - BALANCING , ROTOR BLADES - BENDING & TORSION , FLUTTER - PROPELLERS, HELICOPTER , ROTOR BLADES - FLAPPING , PROPELLERS, HELICOPTER - VIBRATION