Abstract: A motor device for providing propulsion of a floating vessel includes an electrical motor and a propeller arrange inside a propeller house, a hollow rotatable or non-rotatable mid-section arm, a battery and controlling unit. A controlling logic for motor control is arranged inside the rotatable or non-rotatable mid-section arm. The controlling logic includes a heat conductive substrate arranged to contact the inner surface of the rotatable or non-rotatable mid-section arm in a portion of the inner circumference of the rotatable or non-rotatable mid-section arm.

Abstract: Motor assembly for providing propulsion of a floating vessel, comprising: motor device (23), mounting means (24, 32) for attaching the motor device (23) to the floating vessel, the motor device (23) comprising an electrical motor (4) and a propeller (5) arrange inside a propeller house (3).