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.
  • United States
  • Australia
  • France
  • Italia
  • New Zealand
  • Polska
  • Sverige
  • UK