On Fri, 01 Aug 2008 01:06:14 +0100, The Natural Philosopher
wrote:

Actually it sort of does: however the material you use will go up - in
the model airplane world - from balsa, to spruce, to aluminium as you
progress towards that full size spitfire. ;-)

The Spitfire was inspired by medieval trebuchet design, The wing spar is
a tapered beam, formed by laminating simple aluminium box sections of
varying length. Although broadly constant in cross-section, the wall
thickness tapers outwards.