ELI5: Explain Like I'm 5

Similitude of ship models

Okay, let's pretend you have a toy boat and your friend has a toy boat that's way bigger than yours. Even though the boats are different sizes, they might still look pretty similar, right? That's kind of like how similitude works with ship models!

When scientists and engineers study boats, they often build little toy versions called scale models. A scale model is a smaller version of the real boat. The scale model might be 1/10th the size of the real boat, or 1/100th the size, or some other fraction.

Similitude means that even though the model boat is a different size than the real boat, if they have the same shape and proportions, they might still behave in similar ways. For example, if the model boat has a similar weight distribution and similar hull shape to the real boat, it might float and move through the water in a similar way.

Engineers and scientists use similitude to learn more about how boats behave in different conditions. They can test out their theories on a scale model in a lab or pool before building the real boat. This helps them save time and money and make sure the real boat will work correctly.

So, even though the toy boats might not be the same size, they can still teach us a lot about the big boats they represent!