An anonymous reader writes: The likes of GM and Nissan are keeping unusual company in the bidding war to build and deliver the next generation of delivery vehicles for the U.S. Postal Service. Workhorse Group Inc. have made it to the 16-company shortlist with their octocopter drone delivery system, developed by the University of Cincinnati College of Engineering and Applied Science. The self-guiding UAV 'HorseFly' has multiple hardware and software redundancy systems and launches from its special host van 'WorkHorse' to get the parcel the final hurdle to the door. The drone can recharge itself wirelessly in two minutes at base, and calculates its own routes from the van to the destination door.