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Old 13th Jul 2013, 06:18
  #32 (permalink)  
Fark'n'ell
 
Join Date: Feb 2005
Location: NZ
Age: 72
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A good glider these days can make about 55:1. That's roughly 10 miles per 1000'. You can't see the surface at 10 miles from 1000' due to the curvature of the earth.
See an optition.
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