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Grokipedia
I would recommend that for those interested in detail and historical accuracy that you actually make a Grokipedia account. That will allow you to offer corrections to improve the site (just as Wikipedia has done for years).

I've already suggested a couple detail improvements for the CH-46 page. With more to come.
 
Here’s an oldie…maybe even grandpa to some tandem rotor developments, the Bell HSL-1.
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The Bell HSL was powered by a single Pratt & Whitney R-2800-50 radial engine, a double-row, 18-cylinder, air-cooled piston engine rated at 2,400 horsepower. It was a clean sheet design utilizing advanced anti-submarine warfare (ASW) equipment to fulfill its primary role in detecting and engaging submerged threats from naval vessels. In the end it proved too expensive to build. AFIK it is Bell’s only journey into tandem rotor design.
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