A group of young German inventors are poised to carry flight tests of the world's first winged jetpack that can take off from the ground. Fritz Unger and his friends from Hanover have spent more than five years so far developing their one-man, jet-propelled wing. Once completed, the backpack-mounted aircraft, dubbed Skyflash, will be the smallest twin-engined aeroplane ever built and could herald a new era of personal air travel.