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Old 4th November 2008 | 18:37
  #22 (permalink)  
slowrotor
 
Joined: Jul 2003
Posts: 440
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From: Port Townsend,WA. USA
Ring rotor
The interference drag at blade tip/ ring intersection would be a big problem to address, I think.

This might prevent autorotation, as happens with tip jet drag.
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