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Old 25th Jun 2015, 16:29
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chinook240
 
Join Date: Jun 2006
Location: uk
Posts: 463
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Blade Slap...?
If you've got $35, you could read this

http://www.sciencedirect.com/science/article/pii/0022460X66901325?via%3Dihub

Or this is free:

http://www.businessinsider.com/scientists-why-helicopters-are-so-loud-2014-2?IR=T

Don't know if either helps
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