Challenge: Build a boat made out of recycled plastic bottles that can be raced by one or two of your team members the length of the pool at Chadwick using only hands or legs or home-made paddles for locomotion.
Start with a design idea, a vision of what you want your creation to look like. But consider this first -- it doesn't have to be a boat at all! It can be any design you like or want to try out. Create a drawing or two BEFORE you start construction.
How about a little science? A cubic foot of water weighs about 62 pounds. That means that a 120-pound person will float in a boat that is 1 foot by 1 foot by 2 feet -- of course, that could be a bit uncomfortable! Here is another bit of science – an empty 1 liter plastic bottle will displace 2.2046 lbs of water. Keep in mind that the higher you want to float in water, the more buoyancy you will need. Consider the ping pong ball. Its density is 0.06 g/mL so it will float high in water. A lime, however, at 0.98 g/mL will float quite low in water since the density of water is 1.0 g/mL. (Hint: Divide the total weight of your boat + the weight of the passenger(s) by 2.2. The answer is the approximate number of empty liter bottles you will need to float level with the surface of the pool. For more floatation, add more bottles!)
Items to think about:
Some of the fun is in the discovery. So that's it for tips. Now go for it!