Mainsheet Loading Calculator

mainload

The formula for mainsheet loading is not as widely accepted as that for genoa sheet loads and should only be used as a rough guide for offshore boats from 30 ft to 60 ft (9 m to 18 m).

Traveler car adjuster load is generally considered to be .2 times car load.

  (E) Foot length of main in feet
  (P) Luff length of the main in feet
  (V) Wind speed in knots
  (X) Length from aft end of boom to mainsheet attachment in feet

Mainsheet load in pounds


 (E) Foot length of main in meters 
  (P) Luff length of the main in meters 
  (V) Wind speed in knots
  (X) Length from aft end of boom to mainsheet attachment in meters 

Mainsheet load in kilograms


 

Calculations

English mainload-equation1

 
ML Mainsheet load in pounds

 
E Foot length of main in feet

 
P Luff Length of main in feet

 
V Wind speed in knots

 
X Distance from aft end of boom to mainsheet attachment point in feet.

 
Metric mainload-equation2

 
ML Mainsheet load in kilograms

 
E Foot length of main in meters

 
P Luff Length of main in meters

 
V Wind speed in knots

 
X Distance from aft end of boom to mainsheet attachment point in meters.

 
Formulas are for typical cruising monohulls with fixed keel and Dacron sails, sheets, and halyards. Assumes standard roach of 7.5%. For large roach sails such as “flattops” multiply calculated load by the percentage of the mainsail roach. If a sail has 25% roach, multiply the calculated load by 1.25. For all other types, please contact Harken for technical assistance in calculating loads.
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