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IJPE 係用來標示帆的尺寸
Definitions: 定義
I = Height of headstay termination above the sheer line 前帆高
J = Distance between the headstay termination at the deck and the front of the mast at the sheer line. 前帆底部寬
P = Distance between black bands on the mast, or the maximum luff length of the main. 主帆高
E = Distance between black bands on the boom, or the maximum foot length of the main 主帆底部寬
PY & EY are similar to P & E, but indicate mizzen dimensions.
Sail Area Calculations 帆面積計算
(Again, these formulas will give approximate sail area calculations.)
Mainsail Area = P x E / 2 主帆面積計算
Headsail Area = ( Luff x LP ) / 2 前帆面積計算
( 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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