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Rig Dimensions

The Rig Dimension list is helpful in determining your boat's approximate sail area.  Once you have determined your sail area, the figures can be used to calculate the loads generated by the sails for any given wind velocity.  The loading calculations are essential to selecting gear with adequate strength for its intended application.

These definitions are general enough to provide guidelines to approximate your sail area. None of the information here is guaranteed to be accurate, as boat builders often change rig dimensions without notice. You should physically measure your boat and record precise measurements to calculate accurate sail area figures.

Click on the letters to view the rig dimensions of your boat.

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

 

Definitions:

I = Height of headstay termination above the sheer line

J = Distance between the headstay termination at the deck and the front of the mast at the sheer line.

P = Distance between black bands on the mast, or the maximum luff length of the main.

E = Distance between black bands on the boom, or the maximum foot length of the main

PY & EY are similar to P & E, but indicate mizzen dimensions

(Please note that the measurement rules for rig dimensions vary from class rule to class rule, and from measurement rule to measurement rule. Many yacht designers use different definitions as well. These definitions are general enough to provide guidelines to approximate your sail area. None of the information here is guaranteed to be accurate, as manufacturers often change rig dimensions without notice. You should physically measure your boat and record precise measurements to calculate accurate sail area figures.)

Sail Area Calculations

(Again, these formulas will give approximate sail area calculations.)

Mainsail Area = P x E / 2

Headsail Area = ( Luff x LP ) / 2
( LP is the shortest distance between the clew and the luff )

Approx. 150% Genoa Area = ( 1.5 x J x I ) / 2

Approx. 135% Genoa Area = ( 1.35 x J x I ) / 2

100% Foretriangle = ( I x J ) / 2

Approx. Spinnaker Area =  1.8 x J x I

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