Welcome

Welcome to Spinning Wing. We aim to provide useful content about helicopters, tiltrotors, and wind turbines—machines with spinning wings. We are in the process of creating new articles. Feel free to let us know if you have any recommendations, comments or questions.

March 18, 2022. We added a page describing the SAS/SCAS on helicopters.

February 20, 2022. We added a page describing the V-22 flight controls.

February 15, 2022. We updated our helicopter engine article.

February 4, 2022. We've added a longitudinal trim calculator for a conventional hovering helicopter.

January 24, 2022. We've added a lateral trim calculator for a conventional helicopter.

January 11, 2022. Check out our personal air vehicle article. Could they replace helicopters for many missions?

Helicopters

Flight Test Data: Estimating Frequency and Damping

Helicopter Abbreviations and Symbols

Helicopter Components

• Avionics
• Helicopter Anti-Torque Systems
• Helicopter Engines
• Helicopter Landing Gear
• Helicopter Main Rotor Swashplate
• Helicopter SAS and SCAS

Helicopter Flight, Control and Stability

• Collective Rigging for Autorotation
• Coordinated Turns
• Helicopter Autorotation
• Helicopter Climbs
• Helicopter Control Forces
• Helicopter Controls
• Helicopter Forward Flight
• Helicopter Ground Resonance
• Helicopter Lateral Flight
• Helicopter Off-Axis Control Responses
• Helicopter Stability

Helicopter Forces and Moments

Helicopter modeling and simulation

• Helicopter Linear Models

Helicopter Performance

Helicopter Rotors

• Helicopter Blade Modes
• Helicopter Flap Dynamics
• Helicopter Main Rotor Design
• Helicopter Tail Rotor Design
• Momentum Theory for a Hovering Helicopter
• Three State Dynamic Wake

Other Rotorcraft

Calculators

Helicopter Models

Personal Air Vehicles

V-22 Controls

Wind Turbines

Wind Turbine Airfoil Design

Wind Turbine Components

Wind Turbine Startup Process