Originally when my partner Caitlin and I designed our boat we decided to use two water bottles taped together and a plate on top. However the marbles continually rolled around the plate and sunk the boat in either direction. Because of this we added a row Popsicle sticks to the bottom for extra support, put sand in the plate and filled the water bottles with the marbles. We also took our boat "The Lucky Charm", home to work on it and successfully spilled sand every where. The sand however was a huge help in balancing out the weight of our boat.
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