Hey guys,

The wikipedia page for downforce displays the following formula as a means to calculate the downforce of a wing

D=0.5*(WS)*H*alpha*F*rho*V^2

where D= downforce in metres

WS = wingspan in metres

H=height in metres

alpha= angle of attack

F= lift coefficient

rho= air density in kg/m^3

V= Velocity in m/s

does anyone know the source of this formula? or the derivation of it? i need to reference/cite it for a university project.

Thanks.

Any book on lift would have it - it is so basic - but I am not sure who gets the credit for first use/formulation....I should probably know that. Hoerner, in Fluid Dynamic Drag, seems to imply that is was either Lilienthal or Eiffel but it isn't clear. Hoerner's companion book is called Fluid Dynamic Lift - I am sure you could use it or almost any book on aerodynamics.