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[[Image:Helicopter.jpg|400px|right]]
'''Aircraft''' are machines that fly up into the air. The earliest aircraft were [[kite]]s and [[hot air balloon]]s. [[Dirigible]]s filled with hydrogen proved airworthy, but there was always the problem of combustion (see [[Hindenburg disaster]]).
'''Aircraft''' are machines that fly up into the air. The earliest aircraft were [[kite]]s and [[hot air balloon]]s. [[Dirigible]]s filled with hydrogen proved airworthy, but there was always the problem of combustion (see [[Hindenburg disaster]]).