Rim-driven thruster

So imagine you're playing with a toy boat in the bathtub. You push the boat and it moves forward, right? Well, a real boat needs something to make it move forward too, especially if it's a big boat. That's where a thruster comes in.

A thruster is like a special engine that pushes water behind the boat to make it move forward. It's usually attached to the bottom or the back of the boat. But there's a new kind of thruster called a rim-driven thruster that works a little differently.

Instead of a big engine with a propeller (that's the thing that spins and pushes water), a rim-driven thruster has a metal ring that goes around the outside of the thruster. This ring has a bunch of little magnets on it. When electricity goes through the magnets, it makes them spin really fast.

The spinning magnets make the water around the thruster move too. The moving water pushes the boat forward or turns it in different directions. The cool thing about a rim-driven thruster is that it doesn't need as much space on the boat, so it can be used on smaller boats, like a toy boat in your bathtub!

So to sum it up, a rim-driven thruster is a special type of engine that uses a spinning metal ring with magnets to push water and make boats move forward.