From: jimp@gonzo.specsol.net   
      
   Christopher Howard  wrote:   
   > 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.   
   >   
      
   Yeah, but this too is more a rule of thumb.   
      
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   penninojim@yahoo.com   
      
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