# Can endplates be used to reduce chord length by up to 14%?

Can endplates be used to reduce chord length by up to 14%?

I understand large endplates can change the lift distribution from an elliptical one to a uniform one, making the wing more efficient by increasing lift near the wing tips.

This increases the effective aerodynamic span by up to 16% ( see pic below ).

pic: Effect of large endplates on a short span wing, Source: Zenith

Can this be used to shorten the chord?

eg.

16' span, 2' chord, total wing area: 32 sq ft rectangular wing.

Use large end plate, h/b=20%.

revised effective aerodynamic wing span: 16' x 1.16= 18.5'

Revised chord: 32 sq ft / 18.5 = 1.7' chord.

Is this correct thinking?

• I read somewhere many years ago that endplates have to extend about a full chord length beyond the airfoil profile to do much good, at least a net benefit over their own drag. Which is why you rarely see them. The ones you sometimes see on STOL modded airplanes that stick up a couple inches are useless. Apr 21, 2020 at 19:21
• Why would chord be any different? Just because the effective span is increased, doesn't mean the physical area has increased.
– JZYL
Apr 22, 2020 at 15:47