# Dimensional Analysis on Lift Equation not working out?

Thread Starter

Join Date: Nov 2007

Location: NYC

Posts: 117

**Dimensional Analysis on Lift Equation not working out?**

Hello,

I am showing that the equation for lift on a wing is

L=1/2 Cl (air density) (Area of Wing) Velocity^2

However, the dimensions aren't working out.

L is kg ; Cl is dimensionless; Air density is kg/m^3; Area is m^2; Velocity is m/s

If you work the dimensions it does not work out. You get L in kg and kg m on the other side.

What am I missing?

Thanks.

I am showing that the equation for lift on a wing is

L=1/2 Cl (air density) (Area of Wing) Velocity^2

However, the dimensions aren't working out.

L is kg ; Cl is dimensionless; Air density is kg/m^3; Area is m^2; Velocity is m/s

If you work the dimensions it does not work out. You get L in kg and kg m on the other side.

What am I missing?

Thanks.

Join Date: Jan 2008

Location: uk

Posts: 751

I am showing that the equation for lift on a wing is

L=1/2 Cl (air density) (Area of Wing) Velocity^2

However, the dimensions aren't working out.

L is kg ; Cl is dimensionless; Air density is kg/m^3; Area is m^2; Velocity is m/s

If you work the dimensions it does not work out. You get L in kg and kg m on the other side.

What am I missing?

Thanks.

Second, you are missing that lift is a force so it is in Newtons which is also (e.g. from F=ma) = kg*m/s^2

Sorry you didn't discover new physics, maybe next time

Join Date: Mar 2004

Location: Baltimore, MD

Posts: 233

I get the joke, like "new math".