The cabin sways gently on its wheels as the nine-cylinder Alvis Leonides powerplani comes to life. It takes a while for the main and tail rotors to get up to speed, by which time the machine can be heard to generate a distinctive engine note- not unlike, in the words of its pilot, a Harley-Davidson. Final pre-flight checks complete, and the world's only airworthy Bristol Sycamore is ready to take to the skies once more.
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