# The LIFT formula

Updated: Feb 13, 2021

You have to know the lift formula as a PPL by heart, so take the time to learn it. Here it is:

Lift is equal to the coefficient of lift times half rho times velocity squared times surface area (of the wing).

= Lift

= Co-efficient of Lift

= half rho (rho relates to air density)

= velocity squared (velocity is a vector quantity made up of speed and direction)

= surface area of the wing

Just in case you can't quite remember what each part of the formula represents, the next picture should give you a little reminder:

__ - the Co-efficient of Lift__
This is a number between 0 and 2 worked out by the clever folk who are involved in aircraft design and engineering. Us pilots don't have to worry too much about this number, just that it is a part of the all important

*Lift Formula*, and that it is affected by the

**Angle of Attack**of the wing, and the

**Shape of the wing**.

*Can you, as the pilot have an effect on the Angle of Attack of the wing? Can you change it in any way?*

*Can you as the pilot of a light training aircraft change the shape of the wing in any way? Turn it into a Delta Wing? Can you increase it's Camber?*

__ - Rho__

Rho relates to the density of the air at the level and in the conditions in which you are currently flying.

*Can you, as the pilot change the density of the air that you are busy flying in?*

..

__- Velocity squared__

Velocity relates to the speed at which you are flying. Notice its effect is squared, so it has a very significant impact on the creation of lift.

*Can you as the pilot change the speed of the aircraft in any way?*

__- the Surface Area of a Wing__

This is the square foot / meter of the wing.

*Can you, as the pilot, change the surface area of your light training aircraft?*