Of an aeroplane in order to support it upon the ground and to absorb the
shock of alighting. Section--Any separate part of the top surface, that
part of the bottom surface immediately underneath it, with their struts
and wires. Spar--Any long piece of wood or other material. Spar, Main--A
spar within a surface and to which all the ribs are attached, such spar
being the one situated nearest to the centre of
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