By using the method of Orthogonal design this paper investigates the effects of the two-element sail on its aerodynamics performance and the matching of the mainsail and the auxiliary one.
本文用正交设计方法较系统地研究了对二元素帆气动特性的影响因素和主、副帆间的配合问题。
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For example, with the wind at an intensity that a sloop might have to double-reef the main to reduce sail area, a ketch may sail very well under just jib and mizzen.