When not flying airplanes for a living I translate Japanese into English for companies in Japan. Here's an article I translated about the Kawasaki drone:
Kawasaki’s Large, Hybrid Cargo Drone Completes Test Flight.
Kawasaki Heavy Industries has announced the successful test flight of its large, hybrid cargo drone. Called the “Flying Light Truck” and powered by three ZX-10R engines it can carry loads of more than 200 kg and has a range of over 100 km. This heavy-duty drone brings a new dimension to air cargo. And it’s big: approximately seven meters long, five meters wide and two meters high.
The drone uses three, Ninja ZX-10R high-performance motorcycle engines to generate electricity for its eight motors. Unlike drones using only batteries for power, utilizing engines to generate the electricity allows consistent high output over an extended period for a longer time aloft. Compared with helicopters this drone will offer lower operating costs when transporting smaller cargo loads over short and medium distances. Kawasaki believes this heavy-duty drone would fill the niche between small drones and helicopters.
The purpose of the recent proof-of-concept test flight was to confirm the viability of the hybrid propulsion system, the construction layout and production methods. The drone was a joint development project between Kawasaki Heavy Industries Motorcycle & Engine Company and Kawasaki’s Aerospace Systems Company.
川崎重工はこのほど、二輪車エンジンを活用し動力源とした、大型ハイブリッドドローンの試験機『空飛ぶ軽トラック』の浮上試験に成功したと発表した。
www.nirin.co.jp
(Note: Each ZX-10R engine produces approximately 200HP, depending on state of tune.)
It's not hard to imagine a militarized version of something like this equipped with sensors, etc. flying around at 10 or 15K, out-running police helicopters and disappearing over the horizon.