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Old 15th May 2019, 17:35
  #45 (permalink)  
tucumseh
 
Join Date: Feb 2003
Location: uk
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Originally Posted by wokkamate
Also does anyone have a letter/note that was written years ago about the SH 4B4L helmet Pre CEPs and how bad they were at noise reduction?
'The acoustic attenuation of the Mk4 flying helmet...' Royal Aircraft Establishment Technical Memorandum FS171 HMSO 1978. (GM Rood - Dr Graham Rood).
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