Definition
An aircraft design in which two wings of similar size are mounted one behind the other along the fuselage, with both wings producing significant lift. Unlike a conventional aircraft (which has a large main wing and a small horizontal tail) or a canard layout (small forewing, large main wing), a tandem layout shares the lifting load between two comparable wings.
Plain English
An airplane built with two main wings, one in front and one behind, both doing real lifting work rather than one being just a small balancing surface.
Context Anchor
Seen when comparing canard-style aircraft and other nontraditional airplane layouts.
Derivation
Tandem comes from the Latin word meaning 'at length,' later used in English to describe things arranged one behind the other (as in a tandem bicycle, where two riders sit in line). Applied to wings, it simply means one wing follows the other along the length of the aircraft.
Why Pilots Care
Affects pitch stability, stall behavior, and control feel compared with conventional tail designs.
Intuition Check
Do not read tandem here as seating, like two people sitting one behind the other. In this term, tandem means the wings themselves are arranged one behind the other.
Example Sentence 1
The Rutan Quickie is a well-known example of a tandem wing configuration, with both wings carrying lift.
Example Sentence 2
During preflight the instructor pointed out how the tandem wing configuration changes stall recovery compared with a conventional tail.