Tandem-Wing Glider

Quotes:Tandem_Wing.jpg
"A tandem wing aircraft is a fixed wing aircraft with two sets of wings, arranged one in front of the other rather than overlapping each other. NASA research has shown that they must be of different lifting characteristics otherwise a severe oscillation will develop, which has limited their use. A tandem wing can be distinguished from a canard by the location of the pitch controls (elevators) on the rear flying surface. A tandem wing may have the front wing larger than the rear, or the reverse. They have the advantage of normally using fewer struts than biplanes, but the induced drag of having multiple wings is still present, though interactions between the wings may reduce this over a conventional biplane."

-Wikipedia, Fixed-wing Aircraft

Decription:
Tandem-wing aircraft are aircraft with two seperate wings placed in two seperate places, one often counterracting the other. This relitively modern-looking design was in fact developed by the 19th century John Montgomery.

Related:

 * The Principles of Flight
 * The "Evergreen"
 * John Joeseph Montgomery
 * The Santa Clara