Boat propulsion unit

Boat propulsion unit intended to be suspended on the outside of a boat transom and driveably connected to an engine on the inside of the transom, said unit comprising a propeller drive shaft housing, a suspension arrangement intended to be fixedly secured to the transom, pivot means for pivotally connecting the drive shaft housing to the suspension arrangement to allow pivotal displacement of the drive shaft housing relative to the suspension arrangement about a first pivot axis in a vertical plane and a second pivot axis in a horizontal plane, steering means which is arranged to effect pivotal displacement of the drive shaft housing about said first axis, and trim and tilt means which is arranged to effect pivotal displacement of the drive shaft housing about said second axis, said suspension arrangement (2) including a frame member (5) which is intended to be fixed around an opening (12) in a boat transom (4), and a carrier (6) resiliently supported by the frame member and shaped so as to form a flywheel casing (20) adapted to be attached to an engine, said carrier covering the opening and supporting said pivot means.