Search results
Results From The WOW.Com Content Network
A view of the EC120B's tailboom and Fenestron anti-torque tail fan. A Fenestron (sometimes alternatively referred to as a fantail or a "fan-in-fin" arrangement [1]) is an enclosed helicopter tail rotor that operates like a ducted fan.
The tail rotor system rotates airfoils, small wings called blades, that vary in pitch in order to vary the amount of thrust they produce.The blades most often utilize a composite material construction, such as a core made of aluminum honeycomb or plasticized paper honeycomb, covered in a skin made of aluminum or carbon fiber composite.
The tail rotor is a smaller rotor mounted so that it rotates vertically or near-vertically at the end of the tail of a traditional single-rotor helicopter. The tail rotor's position and distance from the center of gravity allow it to develop thrust in a direction opposite that of the main rotor's rotation, thereby countering the torque effect ...
It uses a shrouded fenestron tail rotor and the main rotor features a five-bladed bearingless hub; the shrouded tail rotor has a wider diameter and a thinner chord in order to increase airflow, while design aspects such as a narrow tail boom, swept-back tips on the main rotor blades, and the shrouded tail rotor offer reduced noise.
The upgraded UH-72B model, which harnessed improvements in the mainstream civilian model, featured a number of changes such as a fenestron tail rotor (ducted fan), more powerful engines, FADEC, and enhanced avionics. [57] The B model has a fully automated FADEC for engine control, which reduces the possibility of a hot start. [57]
The Airbus Helicopters H130 (formerly Eurocopter EC130) is a single engine light utility helicopter developed from the earlier Eurocopter AS350 Écureuil, one of the primary changes from which was the adoption of a Fenestron anti-torque device in place of a conventional tail rotor.
In some cases, a shrouded rotor can be 94% more efficient than an open rotor. The improved performance is mainly because the outward flow is less contracted and thus carries more kinetic energy. [6] Among model aircraft hobbyists, the ducted fan is popular with builders of high-performance radio controlled model aircraft.
The Gazelle featured several key innovations, being the first helicopter with a fenestron or fantail; this is a shrouded multi-blade anti-torque device housed in the vertical surface of the tail in place of a conventional tail rotor. [5] The fenestron, while requiring a small increase in power at slow speeds, has advantages such as being ...