Wiki/Vehicles/Water/Submersible

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Submersibles are one of the types of vehicle players can design and operate for their sea rescue service in Stormworks: Build and Rescue.

Submersibles are similar to boats except that primarily operate underwater. By drowning the hull compartments normally filled for air for buoyancy purposes (known as ballasts), a submersible can force itself to sink under the water. As with boats, propellers are used for forward and backward motion, while rudders provide sideways movement, but are also used to provide upwards and downwards movement once underwater (known as 'hydroplanes'). An auto-ballast mechanism is often used to achieve neutral bouyancy by filling fore and aft ballasts according to the submersible's required weight distribution, making controlling the submersible much easier, and a submarine often benefits greatly from having a very low center of mass due to not needing to stay above the water during manuevers and their tendency to roll without it.

In Advanced Mode a submersible is typically powered underwater by batteries, using diesel engines only on the surface to charge the batteries (known as 'diesel-electric). In Normal Mode batteries are not available so diesel engines are typically used instead.

Ballasts
In a typical submersible design, the lower 1/3 to 1/2 of the submersible is set aside for ballasts. Unlike on a boat where these compartment would be left filled with air and closed off entirely, in a submersible they will be flooded to allow the submersible to sink. To do this, Fluid Pumps are used to push water in and out of the compartment through Fluid Ports that separate the inside of the compartment from the sea (or the air).

Typically there are two ballasts, one in the fore (front) and one in the aft (rear). This allows the ballasts to be adjusted to modify the weight distribution of the submersible both in terms of up and down, but also forwards and backwards, enabling neutral buoyancy to be achieved. Each ballast will contain an "in" port and an "out" port, usually run through multiple pumps (as pumping ballasts can be quite a time consuming task). They can be balanced using PID controllers.

Entering the Sub
When submersibles are underwater, sometimes people need to leave or enter for various reasons however, if you use just a regular door the submarine would flood and the submarine would sink, so to get around this problem creators would use an airlock to prevent flooding

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