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Old 14th July 2017 | 14:17
  #10 (permalink)  
NickLappos
 
Joined: Apr 2003
Posts: 3,012
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From: USA
Here is a very detailed FAA document with lots of data. It is "Rotorwash Analysis Handbook" FAA AD A283 719:

http://www.dtic.mil/cgi-bin/GetTRDoc...c=GetTRDoc.pdf
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