The model boat in this project is fitted with two basic devices for controlling water craft. Both operate underwater. The propeller is driven by the engine of a motor- or steam-powered boat. It rotates very fast and pushes the craft through the water. In the project, the engine power comes from the energy stored in a wound-up rubber band. As in real life propellers, the blades are set at different angles, and push the water backward, so thrusting the vessel forward, as it spins. You could try making different propeller designs- with more blades set at different angles, for example – and testing them to see which works best.A rudder is used to steer both sail- and motor-powered boats. It is controlled by a handle called a tiller, or a wheel, on the boat. As in your model boat, the rudder can be moved to different positions to make the boat turn left or right, but will only work when the boat is actually moving. In addition to making the boat turn left and right, the rudder also keeps the boat going in a straight line when it is set straight.
Cork, bradawl, scissors, small plastic bottle, large paper clip, pliers, ruler, bead, long rubber bands, small pencil, pool, thin garden cane.