A Fenestron (or fantail, sometimes called "fan-in-fin") is a shrouded tail rotor of a helicopter that is essentially a ducted fan. The housing is integral with the tail skin and like the conventional tail rotor it replaces, it is intended to counteract the torque of the main rotor.
Full article on Wikipedia: http://en.wikipedia.org/wiki/Fenestron
Interesting picture - Mi-24A with the fenestron:
Full article on Wikipedia: http://en.wikipedia.org/wiki/Fenestron
Interesting picture - Mi-24A with the fenestron:
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