Noun
a kite shaped like a box open at both ends
Source: WordNetStiffness requires structural depth and, where early monoplanes had to have this added with complicated extra bracing, the box kite or biplane naturally has a deep structure and is therefore easier to make both light and strong. Source: Internet
This experiment was widely reported and established the box kite as a stable aerial platform Hudson Shaw, W. and Ruhen, O. (1977) Lawrence Hargrave: Explorer, Inventor and Aviation Experimenter Sydney : Cassell Australia. Source: Internet
His box kite designs were widely adopted. Source: Internet