Abstract: A drive unit for a watercraft, in particular for an inflatable boat, with a motor unit and with a pump unit for the intake, acceleration and expulsion of water, which pump unit is in a driving connection with the motor unit via a power train, and with fastening members for detachably mounting the drive unit to a watercraft. The inboard motor unit and the outboard pump unit are connected with one another via supporting members which serve to support the motor unit, are fastened to a housing enclosing the pump unit and, together with the power train, penetrate a plate which is arranged between the two units, forms a front side of the housing and is detachably connected with the transom of the watercraft.

Abstract: A water-jet drive with a stator and a rotor enclosed by a housing having an inlet and an outlet nozzle, the rotor shaft which supports the rotor at one end and has torque-transmitting means at the other end being rotatably supported in the housing by shaft bearings arranged upstream and downstreams. A shaft bearing associated with the torque-transmitting means and supporting the rotor shaft is constructed so as to enable an axial displacement of the rotor shaft which can be adjusted via an external adjusting member.