Amazon isn't the only one experimenting with a drone delivery program, The Atlantic writes that Google has been experimenting with this as well. For two years, the search giant's Google X lab has been making flying robots that can delivery products across a city in a minute or two under its "Project Wing" program.
During this initial phase of development, Google landed on an unusual design called a tail sitter, a hybrid of a plane and a helicopter that takes off vertically, then rotates to a horizontal position for flying around. For delivery, it hovers and winches packages down to the ground. At the end of the tether, there’s a little bundle of electronics they call the “egg,” which detects that the package has hit the ground, detaches from the delivery, and is pulled back up into the body of the vehicle.