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However, it differs from a conventional open tail rotor by being integrally housed within the tail boom. While conventional tail rotors typically have between two and six blades, Fenestrons have between seven and eighteen blades; these may have variable angular spacing so that the noise is distributed over different frequencies. [6]
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.
It uses a three-bladed Starflex main rotor which is matched to an enclosed tail fan anti-torque device, known as a Fenestron, the latter feature replacing the traditional tail rotor found on the older AS350. The Fenestron has unevenly spaced blades to reduce noise generation by 50% compared to a conventional tail rotor; this enabled an FAA ...
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 ...
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 ...
Unlike later production aircraft, both technology demonstrators flew with conventional tail rotors. [3] A Bo 108 prototype. In the late 1990s, the design was revised with the introduction of the Fenestron tail rotor system, an advanced rigid main rotor, composite materials, and resonance isolation systems. [2]
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Over time, the AS350 Écureuil/AStar has received further development; while the aircraft's design remains broadly similar, aspects such as the rotor system, powerplants, and avionics have been progressively improved. On 6 February 1987, a prototype AS350 flew with a fenestron tail-rotor in the place of its conventional counterpart. On 1 March ...