Aero Ship Buoyancy

Ships built from the Create Aeronautics blocks normally rely on mass and lift balance, and the mod adjusts that with hull-style buoyancy blocks whose Sable mass sets how much lift they give. Weaker buoyancy blocks use Sable mass 1, and heavier blocks at Sable mass 2 remain ballast. Buoyancy only takes effect for hull contacts that touch world water, so lower hull layers supply lift while upper structures mostly add weight.

The aim is to keep large platforms from floating on a single submerged block, while still letting a ship with a real hull stay up. Thrust from propellers is affected by the medium, with a stronger push in water and a lighter one in air. The mod uses a lightweight approximation rather than a full fluid simulation or scanning of the whole ship every tick, so the performance cost stays low.

Installation needs NeoForge, Create, Create Aeronautics and Sable. Aero Ship Buoyancy runs on client and server, so the server and every player need it. Files exist for 1.21.1 only, with 1.4.0 as the latest file, and the code is All rights reserved, so it is not open source.