Abstract: A vessel is provided herein which comprises a primary hull and at least two hull members capable of being deployed from or retracted into tunnels or underneath overhangs in the primary hull. In various embodiments, the vessel comprises a means for controllably deploying and retracting the hull members. These members may further comprise a propulsion means capable of propelling the vessel. In other embodiments the vessel comprises a failsafe mode allowing the hull members to fully retract into the vessel during times of destress. In various embodiments, the vessel is a landing craft capable of loading and unloading cargo without the burden of an overhang cross beam.

Abstract: A watercraft propulsion system is disclosed for an amphibious vessels. The watercraft propulsion system includes a waterjet on each side of the vessel which consist mainly of an impeller, inlet assembly, and stator assembly. The waterjets resists vibrational fatigue and failure through specialized welding between the struts and the inside of the conduit of the inlet assembly. The waterjets can be retrofitted to existing drive shafts to meet the performance requirements of differing amphibious and other marine vessels and to accommodate space limitations. The waterjets are easily installed and removed.