FIELD: aviation.
SUBSTANCE: aircraft configured to hang (1) has a driving means (6), at least one screw (3), a transmission means (5) transmitting power from the driving means (6) to the screw (3) and lubricated with a lubricant, a heat exchanger (9) receiving the heated lubricant from the transmission means (5) and supplying the cooled lubricant to the transmission means (5), and a fan (10) to produce airflow through the heat exchanger (9) for lubricant cooling. The fan has an impeller (16) with blades (21) as well as an exhaust pipe (18) to discharge hot air produced by lubricant cooling. At least one portion (23) of the exhaust pipe wall (22) has a dispersing means (25) adapted to selectively absorb pressure waves in a predetermined frequency band depending on the rotational speed (V) of the impeller (16) and from the number (N) of the blades (21) of the impeller (16).
EFFECT: ability to reduce fan noise.
8 cl, 4 dwg
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