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Thread: Sikorsky X2 coaxial heli developments.
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Old 3rd Jul 2009, 14:10
  #461 (permalink)  
heli1
 
Join Date: Jul 2005
Location: UK
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I see Sikorsky have got the propellor to go round but could someone please point out to them that the world speed record to beat for a Compound Helicopter is 311mph ,not 250mph .Still way to go !
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