Anyone who has strolled around an army or civil helicopter show in the USA lately cannot help but have noticed some strange rotary-wing birds that promise to morph between troop-carrying assault machines and armed gunships, bristling with cannons and Hellfire missiles. Full-scale mock-ups of the Bell Helicopter V-280 Valor and the Sikorsky S-97 Raider, and models of some other radical concepts, are – their creators hope – the future of rotary-wing aviation for the US military.
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