Abstract: A propulsion system for a hydrofoil, planing or semi-planing sea-going vessel having a hull having a port pump water inlet formed therethrough on its port side, a starboard pump water inlet formed therethrough on its starboard side and first, second and third outlets formed therethrough, comprises a booster first stage system in the hull coupled to and driven by the motors. The booster first stage system comprises a first axial water jet pump at the port pump water inlet and a second axial water jet pump at the starboard pump water inlet. A second stage water jet system in the hull aft of the first stage system comprises a third axial water jet pump functioning as a turbocharger.