旋回圈的几何要素 Parameter
of turning circle
进距（纵距）Advance Ad
横距Transfer Tr
旋回初径Tactical diameter Dt
旋回直径（旋回终径）Final diameter D
反移量Kick
进距Ad：
进距通常是指船首向改变90°时船舶重心在平行于原航向的方向上所行进的距离。
the
ship's heading has changed by 90°the ship' s center of gravityin a
directionparallel to the original course the distance travelled.
横距Tr：
横距通常是指当船首向改变达到90°时船舶重心所移动的横向距离t
the
ship's heading has changed by 90°the ship' s center of gravity ransverse
distance.
旋回初径Dt：
当船首向改变达到180°时船舶重心所移动的横向距离。
the
ship's heading has changed by 180° the ship' s center of gravity the transverse
distance travelled.
旋回直径D：是船舶作定常旋回时，重心轨迹圆的直径。
turning
diameter reach steady values the diameter of the track circle.
偏移或反移量Kick：是船舶重心在旋回初始阶段向操舵相反一舷横移的距离。
the
ship' s center of gravity at the entry stage
of the initial phase of the turn tends to skid outwardly from the
original path as the result of the rudder force.
注意：
进距越小，船舶初始旋回性能越好。
The
smaller the advance is,the better initial turning ability.
横距越小，船舶初始旋回性能越好。
The
smaller the transfer is,the better initial turning ability.
旋回初径越小，船舶初始旋回性能越好。
The
smaller the Dt is,the better the turning ability.
