Complete power system including three Navy Kompakt electric motors, suppressed and wired, and one central switching unit (SZM). This unit provides the following facilities: separate speed controllers can be used to control the centre motor and both outside motors; alternatively one speed controller for each of the two outer motors, in which case the centre motor is switched off. The full range of forward/stop/astern is available. Central 6 V and 12 V power supplies.