Hybrid airship

A hybrid airship is an aircraft that combines characteristics of lighter-than-air (LTA), airship technology with heavier-than-air (HTA) technology, either fixed-wing or rotary-wing. A rotastat is a rotorcraft/airship hybrid typically intended for heavy lift applications, while a dynastat is a dynamic lift airship typically intended for long-range
Found on http://en.wikipedia.org/wiki/Hybrid_airship
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