## What are the four aerodynamic forces?

By Aerodynamics

The four aerodynamic forces are thrust, drag, lift, and weight.

## How is lift created?

By Aerodynamics

Lift is created through the combination of Bernoulli’s principle and Newton’s 3rd law.

## What is the lift formula or equation?

By Aerodynamics

The lift formula or equation is CL ½ p V2 S.

## What is induced flow?

By Aerodynamics

Induced flow is the downward vertical movement of air through the rotor system due to the production of lift, often referred to as downwash.

## What is dissymmetry of lift?

By Aerodynamics

Dissymmetry of lift is the unequal rotor thrust, or lift, produced by the rotor disc due to forward flight or wind.

## What is coning?

By Aerodynamics

Coning is an upward sweeping angle of the rotor blades as a result of lift and centrifugal force.

## What is effective translational lift?

By

Effective translational lift (ETL) is when the lift generation from the rotor disc is more efficient due to increased aircraft speed or wind.

## How does a helicopter perform in-ground effect vs. out of ground effect?

By

The rotor disc becomes more efficient within close proximity of the ground, so it takes less power to provide the same amount lift.