Web page 119 of the DMG has stats for airborne and waterborne automobiles. They often have a number of lots of of hit factors.
Nevertheless, isn’t a ship an enormous object? If it had been, it will be topic to the principles regarding objects on pages 246-247. The principles for Big and Gargantuan objects state that:
[…] That mentioned, one torch can burn a Big tapestry, and an earthquake spell can cut back a colossus to rubble. You may monitor a Big or Gargantuan object’s hit factors should you like, or you may merely resolve how lengthy the article can face up to no matter weapon or drive is appearing in opposition to it. When you monitor hit factors for the article, divide it into Giant or smaller sections, and monitor every part’s hit factors individually. Destroying a kind of sections might smash the whole object. For instance, a Gargantuan statue of a human would possibly topple over when one in all its Giant legs is decreased to zero hit factors.
So would a ship not work equally? When you used a spell to blow a gap into the aspect of the ship, might you not make it replenish with water and sink?
Spells like meteor swarm come to thoughts; on common, it’ll do round 160 harm (I consider it additionally applies to things). This isn’t sufficient to destroy most ships (honest sufficient, the blast is just too small), however absolutely it might destroy sufficient of the hull to sink most vessels, no?