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Old 21st January 2014 | 20:09
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Lonewolf_50
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Why Helicopters Make Noise: Germans Show How
This is an ingenous bit of research.
DLR Portal - News - DLR researchers first to make causes of helicopter noise visible

A tip of the cap to our friends in Germany for using this tool to illustrate noise / sound propagation.

Will quieter helicopters result? Maybe not next week, but one hopes they can improve the state of the art.

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