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The biggest-rotor helicopter in the world could lift over 10,000 pounds and be heard from eight miles away
Helicopters come in all sorts of weird shapes and sizes. In the early days of mass-produced helicopters in the 1940s and 1950s, engineers experimented with strange designs and unique concepts, many of ...
Add Yahoo as a preferred source to see more of our stories on Google. 0 GettyImages 477675446 Sean Gallup Getty Images Attack helicopters are often found in the ugliest situations on Earth, and ...
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