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Love the tail rotor....stealthy.
It was originally conceived by Sud Aviation (now Eurocopter, part of the European Aeronautic Defence and Space Company (EADS)).[1]
While conventional tail rotors typically have two or four blades, Fenestrons have between eight and 18 blades. These may have variable angular spacing, so that the noise is distributed over different frequencies and thus sounds quieter. The housing allows a higher rotational speed than a conventional rotor, allowing it to have smaller blades.
The term Fenestron is a trademark of Eurocopter
The Fenestron can be found on many Eurocopter helicopters
ADVANTAGES
AdvantagesIncreased safety for people on the ground. The smaller size allows it to be higher above people or objects on the ground, and the enclosure provides peripheral protection;
Less susceptible to foreign object damage. The higher ground clearance and the enclosure also makes it less likely to strike foreign objects or to suck in loose objects such as small rocks;
Greatly reduced noise and vibration, due to the enclosure of the blade tips and the greater number of blades;
Enhanced anti-torque control efficiency;
Reduced power demand in forward flight
Had the privilege to see F-22 from inside, remarkable and clean, highly digitized control room and cabins. Considering the mediocre digitization in Type-21s, it was a pleasure to see