Down by the head, Down by the stern, On even keel. These expressions mean:
1.The draught forward exceeds the draught aft.
Such a “trim” will have a detrimental effect upon the ship’s speed and steering.
2.The draught aft exceeds the draught forward.
In most cases a certain drag is preferable in connection with the steering of the ship. Too much drag may result in loss of speed. Ships sailing in ballast may need to be trimmed by the stern 1 to 1.5 metres so that the propeller will be sufficiently immersed, say at least two thirds of the diameter, otherwise the power developed may be wasted.
3.The draughts forward and aft are equal.