I created this engineering packet to be used with 2nd graders. This packet lays the foundation for having students go through the engineering process by designing and constructing a sail boat that will float down a river. The river I used was a taped out path on tile. The force used to get the boats moving is a simple fan. We then measure to see whose boat can float the farthest in 10 seconds. Students are then asked to revise their boat to float farther.