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Old 28th April 2010 | 10:02
  #26 (permalink)  
Shawn Coyle
 
Joined: Dec 2001
Posts: 1,835
Likes: 3
From: Philadelphia PA
Mungo:
Nearly all (new design) articulated heads have flap restrainers to prevent the blades from flapping up too high.
Even the S-61 had them, and it goes back quite a long time…
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