The real dimensions may not apply to your boat if the mast or boom has been modified.
Generally, there should be a small gap between the block and the head of the sail when at full hoist so that the sail can be tensioned a bit more when it stretches slightly, as often happens when sailing in heavier winds. The same applies to the foot of the mainsail. Often the boom and mast will have a black strip that indicates the full outhaul or hoist distance.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.