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garymortimer (1882326) writes "Japans ministry of defence has unveiled a new flying trash can, the Honeywell T-Hawk and AESIR Coanda craft prove the popularity of these types with the military and defence developers. We can’t see what advantage they have over large multicopters.
The high energy requirements for this type of flight might just be the perfect fit for the smaller fuel cells beginning emerge into the market place." Link to Original Source
Theory is gray, but the golden tree of life is green.