According to the relevant data of Baidu Encyclopedia, the rudder area can be measured and calculated in the process of ship design, construction and operation, and the data is usually provided by shipyards or ship design agencies. If you need to know the rudder area of a ship, you can consult the shipowner or shipyard, or consult the relevant ship design or construction drawings. In addition, you can also query related information through the search engine, such as "rudder area calculation method" and "rudder area measurement".
The rudder area is the projected area of the rudder blade along the longitudinal section of the ship when the ship is in the forward rudder state.