Multiplane: An aeroplane or glider with two or more mainplanes one above the other. There have been several quadruplanes and many triplanes.
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[edit] Multiplanes
While triplane designs are relatively uncommon, aircraft with four or more sets of wings are even rarer. Extreme examples include multiplanes designed by Horatio Phillips, one of which had two hundred sets of wings.
GAP - The distance between two adjacent wings of a biplane or multiplane.
GCA - Ground-Controlled Approach; part of ILS.
Regarding the aspect-ratio issue; advocates of multiplanes (Horatio Phillips, for example) appear to have worked from the understanding that high aspect-ratio is a "good thing" (true) but not to have had evidence of the detrimental effects of ...
 See also: Aircraft, Lift, Speed, Plane, Wing
  
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