From: christopher@librehacker.com   
      
   Jim Pennino  writes:   
   >   
   > There is a rule of thumb that a decent propeller makes about 20 lbs   
   > thrust per 10 HP.   
      
   Okay, thank you, that is helpful to know.   
      
   >   
   > Alternately Google "how to calculate propeller thrust".   
      
   I don't use Google search, but DDG gives some results that are a bit   
   difficult to wade through. The propeller thrust calculator page gives   
   these equations:   
      
   Velocity = Propeller Pitch * RPM * (1/1056)   
      
   Thrust = (2 * Efficiency * Power * 746)   
            / (Velocity * Propeller Diameter * 0.0254)   
      
   with the Power in watts and the pitch and diameter in inches. That   
   doesn't sound too complicated to calculate.   
      
   --   
   Christopher Howard   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)