We’ve seen a sharp evolution in designs from Amazon. The most primitive was this testing drone we saw from them back in 2013:

To me, this is the most exciting design because it is both a sharp departure from what came before, yet still integrates elements of each previous iteration, showing that the designers/engineers are learning. The total number of rotors has again been changed, this time to 6, and the rear propeller has been nixed. The dual fixed wings have been replaced by a single wraparound wing that takes a hexagonal configuration. The drone takes off vertically, like a helicopter, but then pitches forward at an angle for straight-line flight, using the lift provided by the unusual wing design.

very impressive learning rate.

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