Almost exactly two years after announcing its plans to deliver packages with a drone, Amazon revealed a new prototype of one of its delivery drones. Amazon's prototype is an octocopter - meaning it has eight propellers and can take off and land vertically, like a helicopter. But the design also includes wings and a "pusher motor" so that it can transition from helicopter takeoffs to the energy-efficient flight of a plane at altitude. A pure octocopter wouldn't be capable of a range of 15 miles, like this prototype. Source: Amazon/YouTube