Patent attributes
A propulsion aggregate for boats of planing type is disclosed. The aggregate (10) comprises at least one inboard engine (5) disposed in a supporting frame (6), at least one first drive shaft (1) having a propeller (3), which shaft (1) extends through the boat hull (11) at the stern section of the boat, at least one rudder (12), and a second drive shaft (2) that extends through the stern section of the boat and drives a water turbine (4). The first drive shaft (1) is in direct connection with the power take-off (7) of the engine (5) via a releasable coupling (8) and said first drive shaft (1) is in operation during forward propulsion above a certain speed only, and the second drive shaft (2) is connected to the power take-off (7′) of the engine (5) and is arranged at a higher level than the propeller (3) and said second drive shaft (2) is in operation at forward propulsion at low speeds and at reverse motion.
