[wdfifteen]

There is a device used on sailboats and other applications that I need to describe but I can't find the name of. It is a drum, rotated by an engine. A rope is connected at one end to a crane or boom and the user wraps the other end of the rope around the drum for a few turns. When lifting a sail or cargo the user pulls on the rope, which tightens it against the drum, causing it to wind around the drum, lifting the weight by motor power. To lower the weight or control the speed of the rope the user relaxes the tension on the rope, allowing it to slip on the drum.
It differs from a windlass in that the drum always turns in the same direction and the end of the rope is not attached to the drum. What is this thing called?