Quadruplane: An aeroplane with four mainplanes mounted one above another
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Radial Engine: An aero-engine with its cylinders arranged radially around the crankshaft, the cylinders being stationary and the crankshaft revolving.
QUADRAPLANE, QUADRUPLANE - An aircraft having four or more wingforms.
Quadruplane - Four planes stacked one above another. The Armstrong Whitworth F.K.10 entered production but never saw operational service.
Multiplane - Many planes (May indicate more than one, or more than some arbitrary number).
The same is true of the triple and the quadruplane arrangement. I all we wanted in airplanes was efficiency, we would use mono lanes, but the biplane is pretty popular now in spite of its low efficiency; ...
 See also: Power, Plane, Speed, Wing, Flight
  
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