We aim to provide clear, concise technical information about helicopters and wind turbines. We plan to add about 15-20 new articles in 2020. Articles will vary from high-level information relevant to any reader to technical articles requiring a physics background.

For a short introduction to the uses and strengths and weaknesses of helicopters check out this page. It’s not technical.

Helicopter components

High-level introduction to the main components of a helicopter.

Helicopter controls

The primary controls a pilot uses to fly a helicopter.

Forces acting on a helicopter

The forces and moments that keep a helicopter aloft and allow it to overcome drag and fly with significant airspeed.

Momentum theory

A relatively simple way to estimate a helicopter wake when hovering. This is a technical article requiring a calculus and Newtonian physics background.

Flap dynamics

Introduction to the flapping dynamics of a rotor. This is a technical article requiring a calculus and Newtonian physics background, with very basic differential equations.