A kytoon or kite balloon (a portmanteau of kite + balloon) is a tethered aircraft which obtains lift both dynamically as a heavier-than-air kite and aerostatically as a lighter-than-air balloon. The primary advantage of a kytoon is that it remains in a reasonably stable position above the tether point, irrespective of the strength of wind, whereas...
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http://en.wikipedia.org/wiki/Kytoon
Controllable balloon used as a marker.
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http://www.encyclo.co.uk/visitor-contributions.php
a captive balloon, combining the features of a balloon and a kite, used to maintain meteorological instruments at a fixed height.
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https://www.infoplease.com/dictionary/kytoon
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