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Thread: Noise Footprint
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Old 27th Apr 2005, 12:26
  #10 (permalink)  
helicopter-redeye

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A109s and S76 series helicopters make the most noise footprint overhead HQ Redeye as well so its not just knackered ears and Lancashire landforms. 90 to 150 secs before overhead is a good average for hearing them coming
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