US Patent 9028285 Hybrid marine drivetrain

A hybrid marine drivetrain for a watercraft, the drivetrain including a driveshaft for driving a propulsion device of the watercraft, an internal combustion engine for driving the driveshaft, a motor for driving the driveshaft, a storage unit for storing energy in a form suitable for operating the motor, and a generator driven by the internal combustion engine for generating energy to power the motor, wherein a drive output of the motor is in direct driving connection with the driveshaft, a drive output of the internal combustion engine is in direct driving connection with a rotor of the generator, and a clutch is provided to selectively couple/decouple drive from the internal combustion engine to/from the driveshaft.