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What would happen if you would put four wings on a plane?
Although not common, there have been four-winged planes, or quadruplanes. Great Britian, in World War I, even went as far as making a quadruplane fighter called the Armstrong Whitworth F.K. 10. The benefit of having four wings is more lift than two wings, but there will also be more drag. There will also be less manuverability of the plane with four wings compared to two due to a higher aspect ratio.
Anything more than four wings is called a multiplane. To an extreme, the Phillips Multiplane had 200 individual airfoils, and got enough lift for a 500ft flight, but the drag was so strong that the plane ran at only 40mph. So, putting more wings on a plane will generate more lift but will also increase drag, making the plane much less efficient.
