Ridiculed as playthings in 1835 by the British Admiralty, the humble screw propeller soon proved its detractors shortsighted, and has been powering ships ever since, including the largest ship so far, the 131-ton Emma Maersk container ship, which can carry 14,770 containers at a top speed of 27 knots (31 mph). So you can imagine how big those propellers are. But you don't have to imagine, because Dark Roasted Blend has the photos.

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