From: jimp@gonzo.specsol.net   
      
   Christopher Howard  wrote:   
   > Hi, I did some reading up on the basic math for jet aircraft,   
   > thrust-to-weight ratio, and related concepts. I was trying to relate   
   > this understanding to propeller driven aircraft, like a small   
   > single-prop plane. When I see the stats for these small planes in   
   > magazines, the engine horsepower is listed, along with the power loading   
   > and empty weight.   
   >   
   > I was wondering if it was possible, without diving too deeply into the   
   > math and details, to roughly figure out the lbf that can be generated by   
   > a propeller with, say, a 100 hp engine. Maybe by making a bunch of   
   > simplifying assumptions, like a typical propeller, standard barometric   
   > pressure, and such like?   
   >   
      
   There is a rule of thumb that a decent propeller makes about 20 lbs   
   thrust per 10 HP.   
      
   Alternately Google "how to calculate propeller thrust".   
      
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