|
I, J, P, E: what do they stand for and what knowledge do they give you ?  "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 black band."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. When you know those values you can use the following formulas to calculate approximate areas for: - Mainsail = (P x E) / 2 (add 10% for racing mains)
- 135% Genoa = (( J x I ) / 2) x 1.44
- 100% Jib = ( I x J ) / 2
- Racing Spinnaker = 1.8 x J x I
- Cruising Spinnaker = 1.65 x J x I
|
