First flight of the iconic McDonnell XHJH-1

 

First Flying Twin-Engine Helicopter: Built for U. S. Navy by McDonnell Aircraft Corp., XHJD-1, world's first twin-engine helicopter to fly takes to air in test flight at St. Louis. Two 450-hp. P & W Wasp Jr. engines give over 100-mph. cruising speed and lift useful load of up to 4,000 lb.

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Aviation Week | September 2, 1946