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Genoa System Loading Calculator

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

Calculate

Sheet load in pounds:

Enter the sail area in square meters

Enter the wind speed in knots

Calculate

Sheet load in kilograms:

Reset

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.