There are a wide variety of ways and means to make a vehicle move through the water. As with most other forms of propulsion, you will start by determining the amount of motive thrust you will want for a given speed. Bear in mind that speeds over about 60 kilometers per hour will usually require a specialized hull, hydroplanes, or an abundance of horsepower.

To determine the thrust that you will need, start by calculating the drag of your vehicle. Multiply your vehicle's Area value by the Streamlining Factor from the table below.

Now that you've got the drag, you can calculate your thrust based on your desired speed. Start by finding the cube of your speed, in kilometers per hour. (Multiply your speed by itself, then multiply that product by your speed again.) Divide this value by 600, then multiply by your Drag. The resulting value will be the Newtons of thrust you need to attain that speed.