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Posts
- Category: Fundamentals of Modern Unsteady Aerodynamics (continued)
- Category: HELICOPTER AERODYNAMICS
- Azimuthal Variation of Rotational Resistance Forces and Reactive Torque
- Helicopter Forced Vibrations
- BASIC CHARACTERISTICS OF THE MAIN ROTOR
- Basic Regimes of Operation
- The Operating Regime Coefficient of the Main Rotor
- OPERATION OF THE MAIN ROTOR IN THE AXIAL FLOW REGIME
- Blade Element Theory
- Forces Resisting Rotation of the Main Rotor
- Power and Torque Required to Rotate Main Rotor
- Main Rotor RPM Control
- Techniques for Counteracting Main Rotor Reactive Torque /25
- Main Rotor Power Available
- Main Rotor Thrust in Vertical Climb and Vertical Descent
- Losses of the Real Rotor
- Characteristics of Operation of Coaxial System of Two Main Rotors
- Programmed Testing Questions and Answers
- MAIN ROTOR OPERATION IN FORWARD FLIGHT
- Main Rotor Thrust as a Function of Flight Speed
- Blade Thrust and Its
- Resultant Flow Velocity over Blade Element in the Hub Rotation Plane
- Variation of Circumferential and. Resultant Velocities along Main Rotor Radius
- Drawbacks of Main Rotor with Rigid Blade Retention
- Purpose of Main Rotor Hub Horizontal Hinges
- Conditions for Blade Equilibrium Relative. to the Horizontal Hinge
- Main Rotor Cone of Revolution
- Blade Flapping Motions
- Main Rotor Coning Axis Tilt
- Blade Flapping Motion Restriction and. Flapping Compensator
- Blade Element Angle of Attack Change Owing to Flapping Motions
- Effect of Number of Blades on Main Rotor Aerodynamic Characteristics
- Inertial Forces Acting on Main Rotor Blades
- The inertia forces increase the loads on the main rotor blades
- Oscillatory Blade Motions
- Damping of Oscillatory Blade Motions
- Possibility of Loss of Blade Flapping Motion Stability
- Blade Coriolis force and its azimuthal variation
- HELICOPTER VERTICAL FLIGHT OPERATING REGIMES
- Hovering Regime. General Characteristics
- Diagram of Forces Acting on Helicopter and Hovering Conditions
- Thrust and Power Required for Hovering
- Vertical Climb
- Helicopter Vertical Descent With Operating Engine
- Vortex Ring Regime
- Why does a helicopter have different vertical flight regimes if T = G in all the regimes?
- In what season of the year can a helicopter climb to the highest altitude and lift the greatest load?
- HELICOPTER HORIZONTAL FLIGHT
- Thrust and Power Required. for Horizontal Flight
- Characteristic Helicopter Horizontal Flight Spe
- Effect of Helicopter Weight and Flight. Altitude on Performance
- Factors Limiting Maximal Horizontal Flight Speed. and Ways to Increase This Speed
- How can the maximal flight speed of the helicopter be increased?
- Horizontal Flight Endurance and Range
- How must the engine power be varied with change of the flight speed?
- Effect of flight altitude and air temperature on helicopter flight characteristics
- Factors limiting maximal helicopter horizontal flight speed and ways to increase this speed
- CLIMB ALONG INCLINED TRAJECTORY
- Vertical Rate of Climb
- Variation of Vertical Rate of Climb with Altitude
- HELICOPTER DESCENT ALONG INCLINED TRAJECTORY
- Thrust and Power Required for Helicopter Descent
- Helicopter Rate of Descent With Operating Engine
- Thrust required for various flight regimes and its variation in the different regimes
- Power required for helicopter climb and descent along an inclined trajectory
- Vertical rate of climb and its variation with change of flight velocity and altitude
- Helicopter vertical rate of descent and what it depends on
- HELICOPTER FLIGHT IN MAIN ROTOR AUTOROTATIVE REGIME
- Blade Aerodynamic Forces
- Main Rotor Autorotation Conditions and Regimes
- Conditions for Autorotation of Different Blade Elements
- Gliding
- Vertical Rate of Descent in a Glide
- Safety Height
- Transition From Flight With Engine Operating to Flight. in the Main Rotor Autorotation Regime
- Gliding Characteristics of Dual-Rotor Helicopters
- What determines the blade element autorotation conditions?
- Variation of autorotation conditions for the different blade elements
- Azimuthal variation of the blade element autorotation conditions in helicopter gliding
- What determines the minimal vertical rate of descent during /140 helicopter gliding?
- HELICOPTER TAKEOFF AND LANDING. Takeoff
- Landing
- HELICOPTER BALANCE, STABILITY, AND CONTROL. Helicopter Center of Gravity and Balance
- Helicopter Equilibrium in the Hovering Regime
- Helicopter Static Stability
- Helicopter Dynamic Stability
- Concept of Helicopter Control
- Change of Main Rotor Collective and Cyclic Pitch
- Purpose and Principle of the Main Rotor - Tilt Control System
- Single-rotor Helicopter Control Principles
- Dual-Rotor Helicopter Control Principles
- Concept of Helicopter Controllability
- HELICOPTER VIBRATIONS
- Self-excited Vibrations
- Bending and Bending-Torsion Vibrations of. Rigidly Restrained Blade