File:Helicopter blade tip vortex simulation by DLR.jpg

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Summary

Description
Polski: Symulacja numeryczna wirów powstających w sąsiedztwie wirnika głównego śmigłowca, wykonana przez Niemiecką Agencję Kosmiczną (DLR). Charakterystyczny dźwięk w trakcie lotu śmigłowca powstaje, gdy wir utworzony przez unoszące się rozprężone powietrze znad jednej łopatą wchodzi w kontakt z kolejną łopatą wirnika.
English: Reduced pressure on the top of the blade draws air upwards; this produces a vortex – the blade tip vortex – that is then directed downwards. When other rotor blades subsequently come into contact with these vortices, the 'chopping' or throbbing noise characteristic of helicopters is produced.
Date
Source http://www.dlr.de/media/en/desktopdefault.aspx/tabid-4985/8422_read-19451
Author DLR

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6 April 2011

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