From small to large unmanned aircraft, developments in propulsion and aerodynamics are pushing flight times to new lengths, potentially reaching months.   ACHIEVED Latitude HQ-60 Hybrid quadrotor VTOL Weight: 60 lb. 22 hr. 29 min. ACHIEVED Aerovel Flexrotor Tailsitter VTOL Wingspan: 9.8 ft. Weight: 48 lb. 32 hr. 8 min. PLANNED GA-ASI SkyGuardian Power: Turboprop Wingspan: 79 ft. Weight: 12,500 lb. 40 hr. ACHIEVED NRL Ion Tiger Power: Fuel cell Wingspan: 17 ft. Weight: ...

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