Hummingbird UAS Combines Multi-rotor and Ducted Fan Propulsion

Reference Technologies has designed the Hummingbird UAS which uses both multi-rotors and ducted fans for VTOL capabilities and manoeuvring. The Hummingbird boasts flight times in excess of 5 hours and can lift payloads over 25 pounds, and comes in three flavours: an electric model, a hybrid gas/electric, and a larger model that uses eight external rotors […]

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