Induced drag per unit span when the induced angle of attack is small Calculator

Induced drag per unit span refers to the amount of induced drag generated by an airfoil section located at an arbitrary spanwise station, normalized by the wing’s span. Induced drag is a type of drag that is associated with the generation of lift by an aircraft’s wings. It occurs due to the creation of wingtip vortices, which are the result of pressure differences between the upper and lower surfaces of the wing. 

• Di’ is the induced drag per unit span 
• Li’ is the induced lift per unit span 
• αi is the induced angle of attack