Figure 18-3.-Electrohydraulic winch units.

Winches normally have one horizontally mounted drum and one or two gypsy heads. If only one gypsy is required, it may be easily removed from or assembled on either end of the drum shaft. When a drum is to be used, it is connected to the shaft by a clutch. (NOTE: Another word for gypsy is wanderer. The head is called a gypsy because one or two turns of ship-handling line wrapped around it will wander over the surface between the raised ends of the drum-shaped gypsy when it is rotating. A gypsy head is NOT used to take up wire rope as is done with a rope drum, which resembles a reel used for fishing.)

ELECTRIC WINCHES.-An electrically driven winch is shown in figure 18-4. This winch is a single-drum, single-gypsy type. The electric motor drives the unit through a set of reduction gears. A clutch engages or disengages the drum from the drum shaft. Additional features include an electric brake and a speed control switch.

Capstans

The terms capstan and winch should not be confused. A winch has a horizontal shaft, and a capstan has a vertical shaft. The type of capstan installed aboard ship depends on the load requirements and the type of power available. In general, a capstan consists of a single head mounted on a vertical shaft, reduction gearing, and a power source. Electric capstans are usually of the re-versible type. They develop the same speed and power in either direction. Capstans driven by alternating current motors run at either full, one-half, or one-third speed. Capstans driven by direct current motors usually have from three to five speeds in either direction of rotation.