Abstract: A slat roof with slats and with an adjusting device for rotating the slats about a rotational axis between a closed and an open rotational position, the rotational axis running parallel to the longitudinal extension of the slats. In the closed rotational position, the slats lie against one another in overlap regions along the longitudinal edges of the slats and/or are coupled to one another by sealing elements or guiding systems which engage into one another, and the slats can be adjusted into rotational positions up to the completely open rotational position by the adjusting device. Solar cells for converting solar energy into electric energy and/or a solar collector for converting solar energy into thermal energy are attached in or on at least one of the slats or are integral components of the slats. This invention allows the incident light into a roofed area to be regulated while simultaneously using the impinging solar energy.

Abstract: An electric motor-driven water craft including a fuselage, on which a user can at least partially lie or stand. The fuselage has a flow channel with a screw that is driven by an electric motor and contains the electric motor and batteries, in addition to a control device for the electric motor and the screw, and those items are housed at least partially in the flow channel. This invention provides a higher power for motor-driven water craft of this type by locating the batteries in a water-tight housing. At least some sections of the batteries are in thermally conductive contact with the housing. The housing can be at least partially of a thermally conductive material and/or the electric motor is an internal-rotor motor. The stator is in thermal conductive contact with a housing of the electric motor by a heat conducting unit.