JIm's not saying that they run with two headsails up... although this was done to sail wing-on-wing in the trades...but that having two grooves allows you to hoist a smaller or larger headsail to replace the one that is already hoisted, to better suit the changing wind conditions, before lowering the current headsail. This is important when racing so you don't lose too much boat speed during a headsail change.
If you google for "twistle sail rig" I'm pretty sure you'll find some pictures or drawings of the setup.
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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.