Analytical comparison of longitudinal launching of a vessel into the water with grounding
A large number of large ships are wrecked on a regular basis in the world. The number of crash cases is growing every year. Wrecks occur, among other things, due to the significant size of ships, the growth of traffic on sea routes, the growth of traffic speeds, unfavorable meteorological conditions, and the shortcomings of modern navigation systems. Based on this, more attention should be paid to methods and means of rescuing a ship in case of a wreck. In the event of a shipwreck, deliberate grounding of the ship may be used to save lives and cargo. The relevance of the study of issues related to deliberate grounding is confirmed by: the development of new methods for pulling a ship aground, development in the field of the creation of unmanned vessels, the International Convention on the Training and Certification of Seafarers and Watchkeeping, which requires the boatmaster to: the ability to carry out deliberate grounding, an understanding of basic actions in the event that a grounding is imminent and of actions after a grounding. The paper considers the longitudinal launching of the vessel into the water forward stern. Analytical proof is given that, in the first approximation, the longitudinal launching is similar to the landing of a ship aground. The corresponding mathematical calculations are given. From the above evidence it follows that in the practice of shipping, in an emergency, it is possible to calculate the aground so that it can lead to the salvation of the vessel and, as a consequence, of its crew and passengers.