The Kokusai Ku-7 Manazuru (White-naped Crane) was a large experimental twin boom Japanese military glider. The use of a twin boom design allowed for a large square cargo door, which meant that the aircraft was capable of carrying either 32 soldiers, 7600 kg of cargo or even a light tank.
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http://en.wikipedia.org/wiki/Kokusai_Ku-7
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