Earlier this year, the team put Clemmons's unlikely theory to the test, using a 40-square-metre rectangular nylon sail.
今年早些时候，研究小组使用了一个40平方米的长方形尼龙帆，对克莱蒙斯的不可能理论进行了测试。
Therefore square-riggers cannot sail upwind.
因此方帆船无法逆风航行。
In all, a ketch carries about the same total square footage of sail area as a sloop of the equivalent size.
总而言之，一艘双桅帆的总体帆面面积和一艘同样尺寸的单桅帆差不多。
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