Abstract: A method and a device for power transmission from a motor having a supercharging assembly, particularly a supercharged diesel-engine (7), to a gear (3) with a surface water driving propeller mechanism (4) mounted in a boat of the planing variety and preferably with a large propeller with a large pitch. A turbine coupling (10), which can be filled to a variable extent, is mounted between the supercharged motor (7) and the gear (3). The motor is designed to drive the pump portion (15) of the turbine coupling (10), and the turbine portion (17) of the turbine coupling (10) is connected to the input shaft (6) of the gear (3). The turbine coupling (10), when the boat is started, is emptied completely or partially, in such a way that it is at least partially disconnected from the gear. The motor is then accelerated to such a speed that the supercharging assembly of the motor (7) is connected.

Abstract: A marine propulsion drive apparatus has an input drive shaft with a propeller shaft extending through the stern of the boat and a drive body extending substantially straight out the stern of the boat and having a propeller at the end thereof. Steering is accomplished by operating the drive body itself. The drive body and the stern of the boat have a common oblique upward rearward slope. The contact surface of the drive body is mounted rotatably about an axis which is perpendicular to the contact surface such that when the boat is turned in one direction or the other, the entire drive body with the propeller mechanism is rotated about that contact surface, such that the propeller mechanism at the outer end of the drive body both rotates in the horizontal plane and also dips successively downwards following the rotating movement of the drive body.

Abstract: A marine propulsion driving apparatus for an inboard engine of the type having an input drive shaft with a propeller shaft extending through the stern of the boat, with the body of the drive extending substantially straight out from the stern of the boat with a propeller at the outer end thereof. Both steering of the boat and vertical trimming of the drive body are brought about by operating the drive body itself, the drive body being mounted in a mounting ring at the stern of the boat. A trimming mechanism mounted relative to the mounting ring includes two cooperating inclined adjustment rings mounted in direct contact with each other. One of these adjustment rings carries the drive body and the two adjustment rings are rotatable relative to each other such that different inclination angle combinations are obtained and the drive body is thereby trimmed vertically.