最后，一些历史上著名的船只使用下风板(leeboard)取代活动龙骨板；这些下风板悬挂在船只底部的两侧，可以像活动龙骨板一样被放下来以抵抗侧向晃动。
Finally, some historic craft have leeboards instead of centerboards; these boards, mounted outside the hull on both sides, can be pivoted down like a centerboard to resist leeward motion.
所制作得到的风管为由左右风管板和上下风管板围成的棱弧形管状体。
The blast pipe produced is a arc tube encircled by the left and right blast pipe board and the top and bottom blast pipe board.
分析表明，主梁下风侧附加翼板对悬索桥颤振是一种有效的气动控制措施。
The analysis shows that the additional surface attached below the trailing edge is an effective aerodynamic means for suppressing the flutter of suspension Bridges.
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