This introductory activity gives students the challenge of building a LEGO boat (with limited pieces) that floats and holds the most weight afloat. The students will begin to see how buoyancy works and gain familiarity with putting LEGO bricks in water.

This is a student project from the assistive devices curriculum.

Have the students make a sample program as a class where one student is the robot with their left leg acting as motor A and their right leg acting as motor B. You can print off ROBOLAB icons and put them on the board as they make the program.
test

In this activity students explore how a propeller's size can influence the amount of propulsion they will get. They will build a simple set-up where they can record how many revolutions a certain propeller makes in a set time. This can be compared to the same set-up with different sized propellers. ...

Students will explore how changing gear ratios can increase the or decrease the propulsion they get from their propeller. This activity can also be done in conjunction with the Propulsion - prop size activity in this Underwater Robotics unit.

NOTE: The RCX should never be submerged in...

In this activity students will be connecting a LEGO motor to various batteries to test their assumptions about the effect these batteries have on the speed of a motor. NOTE: This activity works with both NXT and RCX motors.

In this underwater activity students build a boat with two motors and touch sensors that they must navigate through a small course.

NOTE: The RCX cannot be submerged in the water.
Propellers can be bought at http://www.hobby-lobby.com/boatprop.htm
3/16" Drive dog props ...

This giant walking crab was built by the imagination of resident LEGO genius Carter. Using pneumatics, the crab walks with two 3-point movements (front and back leg of one side with the middle leg of the opposite side). A series of 4 motors perpetually pressurizes 3 air tanks supply the power. A mot...

In this activity students explore the concept of torque and build a "boat" with two propellers facing opposite directions. If you spread the motors apart the boat will spin faster and if you move them in it will spin slower. A great lead up activity to the Slalom Boating Activity also in this Underw...

Think about when you give students accessories and LEGO People. Kids can often get distracted with decorating over the goal of the activity. I give students people once they have passed whatever tests their creation needs to pass.