A movable keel in a sailboat that can be pivoted upward to reduce the boat's draft in shallow water.
A movable keel in a sailboat that can be pivoted upward to reduce the boat's draft in shallow water.
活动防浪板帆船上一活动龙骨，可以绕枢轴扯起以减少船在浅水的吃水深度
A movable keel in a sailboat that can be pivoted upward to reduce the boat's draft in shallow water.
活动防浪板帆船上一活动龙骨，可以绕枢轴扯起以减少船在浅水的吃水深度