bae system 's typhoon is so accurate that even the slightest shifts in gravitational pull , experts must build the jet on ` floating ' concrete rafts that move in sync with the moon .
the typhoon -lrb- pictured -rrb- is powered by two eurojet ej200 engines that it is 49ft -lrb- 15 metres -rrb- long from tip to tip and the material is ` no more than the thickness of a match stick that