Squaresails have been used on sailing vessels for centuries and when the wind is dead astern, a squares’l is still a very efficient way to propel a boat of any size, even today. Anyone with triangular Bermudan sails knows how tricky it can be to keep them filled and hold a steady course when running before the wind. But with a squaresail it’s a dream.
The article is a long detailed explanation of why and how it was done.
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IN PRAISE OF THE SQUARE SAIL