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Posts
- Category: Principles of Helicopter Aerodynamics Second Edition (continued)
- Other Anti-Torque Devices
- Representative Tail Rotor Designs
- Design Requirements
- "Pushers" versus “Tractors”
- . Precessional Stall Issues
- Thrust Requirements
- Physical Size
- Design of Tail Rotors
- Role of Wind Tfinnels in Aerodynamic Design
- Vertical Stabilizer
- Empennage Design
- Fuselage Side-Force
- Vertical Drag Recovery
- Vertical Drag and Download Penalty
- Fuselage Aerodynamic Design Issues
- Case Study: The BERP Rotor
- Airfoil Sections
- Blade Planform and Tip Shape
- Blade Twist
- Number of Blades
- Rotor Solidity
- Tip Speed
- Rotor Diameter
- Design of the Main Rotor
- Conceptual and Preliminary Design Processes
- Overall Design Requirements
- Aerodynamic Design of Helicopters
- Chapter Review
- Factors Influencing Performance Degradation
- Transient Maneuvers
- Steady Maneuvers
- Performance in Maneuvering Flight
- Forward Flight Near the Ground
- Ground Effect
- Implications of VRS on Flight Boundary
- Quantification of VRS Effects
- Vortex Ring State (VRS)
- Autorotation Index
- Height-Velocity (H-V) Curve
- Autorotation in Forward Flight
- Autorotational Performance
- Performance of Coaxial and Tandem Dual Rotor Systems
- Factors Affecting Maximum Attainable Forward Speed
- Range—Payload and Endurance-Payload Relations
- Speed for Maximum Range
- Speed for Minimum Power
- Engine Fuel Consumption
- Effect of Density Altitude
- Performance Analysis
- Total Power
- Tail Rotor Povser
- Parasitic Power
- Reverse Flow
- Compressibility Losses and Tip Relief
- Forward Flight Performance
- Hovering and Axial Climb Performance
- The International Standard Atmosphere
- . Helicopter Performance
- Typical Trim Solution Procedure for Level Flight
- Equations for Free-Flight Trim
- Introduction to Rotor Trim
- Semi-Rigid or Hingeless Rotors
- Coupled Flap-Lag Motion
- Dynamics of a Lagging Blade with a Hinge Offset
- Review of Rotor Reference Axes
- Blade Feathering and the Swashplate
- Dynamics of Blade Flapping with a Hinge Offset
- Lateral Flapping Angle
- Longitudinal Flapping Angle
- Physical Description of Blade Flapping
- Equation of Motion for a Flapping Blade
- Equilibrium about the Lead-Lag Hinge
- Equilibrium about the Flapping Hinge
- Types of Rotors
- Rotating Blade Motion
- Chapter Review
- Inflow Model of Mangier & Squire
- Linear Inflow Models
- Blade Element Analysis in Forward Flight
- Weighted Solidities of Tapered Blades
- Weighted Solidity of the Optimum Rotor
- Power-Torque Weighted Solidity
- Mean Wing Chords
- Equivalent Blade Chords and Weighted Solidity
- Compressibility Corrections to Rotor Performance
- Further Comparisons of BEMT with Experiment
- BEMT in Climbing Flight
- Blade Design and Figure of Merit
- Prandtl’s Tip-Loss Function
- Power Estimates for the Rotor
- The Optimum Hovering Rotor
- Effects of Swirl Velocity
- Distributions of Inflow and Airloads
- Ideal Twist
- Radial Inflow Equation
- Assumed Radial Distributions of Inflow on the Blades
- Blade Element Momentum Theory (BEMT)
- Tip-Loss Factor
- Torque-Power Approximations
- Linearly Twisted Blades, Uniform Inflow