From: tjroberts137@sbcglobal.net   
      
   On 8/15/17 8/15/17   1:14 PM, Richard D. Saam wrote:   
   > Basic momentum transfer indicates faster than wind is not possible   
   > assuming uniform wind gradient from surface to sail or propeller height.   
      
   It is quite common for iceboats and modern catamarans to sail faster than the   
   wind, sometimes much faster (3X - 5X). They do this on a reach (i.e. traveling   
   cross-wind), not a run (downwind), because then the sails can create   
   aerodynamic   
     lift to propel the boat forward. For most modern sailboats a close reach is   
   the fastest point of sailing, unless waves interfere.   
      
   Tom Roberts   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)