Fenestron

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Another form of antitorque rotor is the fenestron or “fan-in-tail” design. This system uses a series of rotat-ing blades shrouded within a vertical tail. Because the blades are located within a circular duct, they are less likely to come into contact with people or objects. [Figure 1-4]

Figure 1-4. Compared to an unprotected tail rotor, the fene-stron antitorque system provides an improved margin of safety during ground operations.