Most winches have more than one drum. In Europe, one winch can have up
to 8 separate drums and lines. This enables a launch every 3 minutes
or less.http://www.hydrostart.nl/EN/

Oh, sure. But what if a club wanted to have one winch for high
launches, located at the far end of a runway, and another one for
circuit practice, located in the middle of the runway?

Bartek