Frers 31 Halyards 

How to Calculate Sail Areas


The following formulas will give you approximate sail areas:

Mainsail = (P x E) / 1.8 (1.6 for racing profile mainsails)

155% Genoa = (( J x I ) / 2) x 1.65

135% Genoa = (( J x I ) / 2) x 1.44

100% Jib = ( I x J ) / 2

Racing Symmetrical Spinnaker = 1.8 x J x I

Racing Asymmetrical Spinnaker = 1.8 x J x I

Cruising Asymmetrical Spinnaker = 1.65 x J x I

Formula Definitions


I is measured along the front of mast from the genoa halyard to the main deck. The main deck is where the deck would be if there were no deckhouse.

J is the base of the foretriangle measured along the deck from the headstay pin to the front of the mast.

P is the luff length of the mainsail, measured along the aft face of the mast from the top of the boom to the highest point that the mainsail can be hoisted, or to the black band if there is one.

E is the foot length of the mainsail, measured along the boom from the aft face of the mast to the outermost point on the boom to which the main can be pulled, or to the black band if there is one..

ISP is similar to I. It is measured from the highest spinnaker halyard to the main deck.

JSP is the length of the spinnaker pole or the distance from the forward end of the bowsprit (fully extended) to the front face of the mast.

Py and Ey, respectively, are the luff length and foot length of the mizzen of a yawl or ketch, measured in the same way as for the mainsail.

Iy is the measurement from the staysail halyard to the main deck.

Jy is the measurement from the staysail stay pin to the front face of the mast.

LP is the shortest distance between the clew and the luff of the genoa.


Sailboat Rig Dimensions

Currency:
MPRGHC10L088 - Cruising Genoa Halyard: 26.8m (88 ft) - Polyester Double Braid 10mm (3/8") w/shackle
Code: MPRGHC10L088
Price: $177.40
MPRGHR08L088 - Racing Genoa Halyard: 26.8m (88 ft) - Vectran Double Braid 8mm (5/16") w/shackle
Code: MPRGHR08L088
Price: $411.00
MPRMHC10L096 - Cruising Mainsail Halyard: 29.3m (96 ft) - Polyester Double Braid 10mm (3/8") w/shackle
Code: MPRMHC10L096
Price: $160.60
MPRMHR08L096 - Racing Mainsail Halyard: 29.3m (96 ft) - Vectran Double Braid 8mm (5/16") w/shackle
Code: MPRMHR08L096
Price: $395.10
MPRSHC08L088 - Cruising Spinnaker Halyard: 26.8m (88 ft) - Polyester Double Braid 8mm (5/16") w/shackle
Code: MPRSHC08L088
Price: $150.50
MPRSHR08L088 - Racing Spinnaker Halyard: 26.8m (88 ft) - Dyneema Double Braid 8mm (5/16") w/shackle
Code: MPRSHR08L088
Price: $404.00
   

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