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From my dear Scott site and from DTIC report;
A Boeing-Vertol tiltrotor design from 1970. Designed to USAF requirements, this could serve as either a transport or rescue craft. As a transport, the radius was 250 nautical miles with a cruise speed of 350 knots; witha 5-ton payload, vertical liftoff could be achieved at an altitude of 2,500 feet and a temperature of 93 degrees F. For rescue missions, the radius was 500 nautical miles with an assumed thirty-minute hover over the rescue location.
http://up-ship.com/blog/?cat=13&paged=28
http://www.dtic.mil/dtic/tr/fulltext/u2/869949.pdf
A Boeing-Vertol tiltrotor design from 1970. Designed to USAF requirements, this could serve as either a transport or rescue craft. As a transport, the radius was 250 nautical miles with a cruise speed of 350 knots; witha 5-ton payload, vertical liftoff could be achieved at an altitude of 2,500 feet and a temperature of 93 degrees F. For rescue missions, the radius was 500 nautical miles with an assumed thirty-minute hover over the rescue location.
http://up-ship.com/blog/?cat=13&paged=28
http://www.dtic.mil/dtic/tr/fulltext/u2/869949.pdf