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Old 8th Apr 2013, 13:35
  #6 (permalink)  
misd-agin
 
Join Date: Jan 2006
Location: US
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Asymmetrical deployment for roll.

Symmetrical deployment in flight for drag(reduce airspeed of increase rate of descent).

Symmetrical deployment on ground. Increase brake effectiveness by increasing weight on wheels but also has a drag effect.
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