如果活动龙骨不带负重，例如许多小型帆船使用的玻璃纤维活动龙骨，那么水手们必须通过将他们自己的体重压在船只的逆风侧来保持船只直立。
If the centerboard is not weighted, like the fiberglass centerboards of many small sailboats, then sailors must keep the boat upright by positioning their own weight on the upwind side of the boat.
所有的帆船都为了这个理由需要某种龙骨：狭窄平滑的龙骨表面对于帆船的前行几乎没有阻力，但却能很好抗拒侧移力。
All sailboats need a keel of board for this reason: the narrow, flat surface of the board or keel produces little drag when the boat moves forward but resists motion sideways.
在使用活动龙骨的帆船上，活动龙骨的功能和固定龙骨一样，是防止船只被吹打得侧晃。
On centerboard sailboats, the centerboard functions like a keel to keep the boat from being blown sideways.
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.
一侧有爪，呈龙骨瓣三角状半圆形。
Claw on one side, showing triangular-shaped semi-circular keel.
综合分析国内外玻璃钢渔船的连接技术及结构形式，确定了玻璃钢渔船舷侧结构、甲板与上层建筑以及舭龙骨的连接技术。
Synthesizing the technology of joint and many structure models, the side structure and the joint technology between decks, upper buildings and bilge keel was determined.
研究了轻钢龙骨体系的抗侧能力。
The resisting lateral deformation capability of joist structure system is studied.
研究了轻钢龙骨体系的抗侧能力。
The resisting lateral deformation capability of joist structure system is studied.
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