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Date: Jul 1, 2011
Douglas
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According to boxkite:

USA:
Douglas project (shaft drive). This company is developing a fifty-passenger helicopter as a DC-3 replacement type. Engines may be two Rolls-Royce RB 109 turboprop variants. [I believe this is either the patent shown here ->http://www.secretprojects.co.uk/forum/index.php/topic,898.msg20402.html#msg20402 (too early), nor the compound helicopter from AIR PROGRESS - Spring 1962, page 40 (too late).]



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From Stephane, a ducted-fan tilt-rotor, possibly the D-828 or D-829:



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lllll   As of 2019 I have transitioned; My name is now Rei. Please don't deadname or misgender me, thank you. <3   lllll



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Date: Dec 9, 2011
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I think you are right my dear Stingray



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hesham


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From 1962 issue of Air Progress.



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