boat ideas : http://www.highhopes.com/maverickboats.html
In this event students will be given a bag of materials to build a freestanding tower as high as they can. Only the materials in the bag and the bag itself may be used. The tower must support the weight of a tennis ball. The top of the tennis ball is the height measured. In the event of a tie the winner will be determined by who has the smallest base measurement.
Science Olympiad Site with explanations on structure:
Straw Egg Drop