By Catrin Nye
How do you deliver food and medicine to people in an area where a cargo plane would be shot down? It was a question that kept US Air Force pilot Mark Jacobsen awake at night after he met Syrian refugees in Turkey. Then he had an idea – a swarm of tiny drones, each delivering 1kg or 2kg at a time.
On an airfield in Sacramento a group of aircraft enthusiasts make noisy toy helicopters perform stunts in the air. US army vehicles sit nearby. It’s a baking hot California afternoon, everyone is wearing caps and chasing children to smear sun cream on them as they stare up at the sky.
But next to the regulars is another group, testing custom-built drones. They catapult them into the air at regular intervals and make them circle repeatedly for kilometre after kilometre.
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