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Laddermill
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<p>A laddermill kite system is an <a href="/facts/Airborne_wind_turbine/vHh3EtRC">airborne wind turbine</a> consisting of a long string or loop of <a href="/facts/Power_kite/06CRooSS">power kites</a>. The loop or string of kites (the "ladder") would be launched in the air by the lifting force of the kites, until it is fully unrolled, and the top reaches a height determined by designers and operators; some designers have considered heights of about 30,000 feet (9,100 meters), but the concept is not height-dependent. The laddermill method may use one endless loop, two endless loops, or more such loops. </p>