Genoa System Loading Calculator

    Genoa-load

    Because wind speed is squared, it is the most important variable and can greatly influence loading. Wind speed (the apparent wind) should be calculated for the specific sail being analyzed. For example, the #1 genoa on 7 m (25 ft) boat might only be carried in 15 knots of wind while the #3 blade on a Maxi-boat could well be carried in 40 knots.

    To calculate loading on a genoa lead car, multiply sheet load by the load factor of the sheet. Most #1 genoas will deflect about 45° while a #3 genoa may deflect 75° or more.

    Lead car adjuster tackle load is dependent on the angle of deflection of the sheet in the lead car, but is generally assumed to be .3 of lead car load when deflection is 45° and .5 of lead car load when deflection is 60°. 

      Enter the sail area in square feet
      Enter the wind speed in knots

    Sheet load in pounds


      Enter the sail area in square meters
      Enter the wind speed in knots

    Sheet load in kilograms


     

    Calculations


     

    English

    SL = SA x V2 x 0.00431
     


     
    SL
    Sheet load in pounds

     
    SA
    Sail area in square feet

     
    V
    Wind speed in knots

     
     

     

    Metric

    SL = SA x V2 x 0.02104
     


     
    SL
    Sheet load in kilograms

     
    SA
    Sail area in square meters

     
    V
    Wind speed in knots

     
    Formulas are for typical cruising monohulls with fixed keel and Dacron® sails, sheets, and halyards. For all other types, please contact Harken for technical assistance in calculating loads.

    Dacron is a registered trademark of E. I. du Pont de Nemours and Company or its affiliates.

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