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Sail Wind Load is the force the apparent wind is placing on a sail. 

Load in Pounds = Sail Area * (Wind Speed )2 * 0.00431

This equation is helpful in determining the size of the winch which is needed for the management of a 100% jib in a heavy wind.  Divide the pounds of pressure on the jib by the gear ratio of the winch and by the ratio of the winch handle's length to the radius of winch's drum.  This will give the force needed to operate the winch in a heavy wind.
     

    Enter this information to find the sail wind load:
   
1.  Enter the Sail Area in Square Feet: 
  
2.  Enter the Wind Speed in Knots: 
  

   (OPTIONAL) Enter the above and below  information to find the winch handle load:
  
3.  Winch Gear Ratio:    to 1

4: Winch Drum Diameter in Inches: 

5:  Winch Handle Length in Inches:  
   

  

  

   
 
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