Boeing V/STOL Aircraft
Boeing Vertol Division

USAF ARS (Advanced Rescue Aircraft)
Rotors are driven by gas turbines in wing tip nacelles. When in forward flight, the rotors fold into the nacelles and propulsion is provided by the engines which will act as turbofans. Designs circa 1969.
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    Sources:
  • "Straight Up and Away" Flying Review International. May 1969: 51-52.
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