They're all veh simple
For example the deHavilland Vampire is kept aloft by lots of vampire bats fastened with blu-tak and encouraged to fly very fast by the judicious application of the pilots blood to little strings just in front of their mouths.
Unfortunately the pilots would often fall unconscious through lack of blood and crash the plane. For this reason alone the Vampire was withdrawn from service
( ,
Tue 6 Aug 2002, 9:30,
archived)
Unfortunately the pilots would often fall unconscious through lack of blood and crash the plane. For this reason alone the Vampire was withdrawn from service
hence
the introduction of the DeHavilland Vixen, and altogether more attractive proposition
( ,
Tue 6 Aug 2002, 9:41,
archived)