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Old 01-21-2013 | 01:34 PM
  #647  
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fly24-7
 
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From: Shrewsbury, MA
Default RE: New Evolution 10cc gas engine

I believe the tipping point is around 7 pounds.

6 and below - great basic aerobatic performance to 3D.
6-7 - solid basic aerobatics performance.
7 and up - aerobatics performance begins to diminish and you're heading towards trainer/WWI applications.