To set the mood, let's start with your morning earworm: "Come Sail Away" by Styx.
Now that we're all humming along together, we can get building! First you need to assemble materials: A tray to act as the hull (we used small cardboard ones donated by Nature's Harvest), a bamboo skewer to act as the mast (a small dowel or pencil will also work), lots of colorful duct tape, a small amount of modeling clay, scissors, wax paper for the sail and an old foam egg carton for the rudder.
You start by covering your hull with duct tap, top, bottom and sides. If you want, you can also build up the sides a bit with tape, to prevent water from coming onboard.
Next we need to attach the sail. I chose wax paper because it's relatively waterproof and inexpensive. That means you can try lots of different sail shapes, if you like. You don't have to stick with the standard rectangle. Try a circle or triangle or a octagon, if you like! Attaching the sail is very simple: just cut two slits in the paper with scissors and slide it onto the mast. If you plan to change shapes often, using a bit of tape to build up spots on the mast to hold the sail in place will suffice. For more longevity, use a bit of scotch tape to hold your sail onto the mast. In either case, be sure to create a "cup" in the sail to catch the wind.
Over the course of our build at Science and Swim, we experimented with lots of ways to make our sails sturdier, as it was pretty windy. One mom had a great idea: putting a strip of duct tape on the top and bottom of the wax paper to add stability. We also experimented with creating tie lines with tape and using materials like old plastic bags and ziplocks for sails. You can even build a sail out completely of duct tape. This is where prototyping is important! Keep modifying that design until you get it to do what you want!
It's also fun to add a rudder, so that you can steer your boat. (This also illustrates an important idea about fluid mechanics, by the way.) To make the rudder, just cut a piece of foam from your egg carton, cover it with duct tape and cut out a small wedge. Then make a slit in the back of your boat and fix the rudder in place. By changing the angle of the rudder, you can change the direction of the boat. It's a lot of fun to experiment with different rudder shapes too!
Then it's time to take the boat to the water and give it some wind! If you have rough waters, you will need to replace your sails, as the wax paper will eventually break down and start to fall apart.
One creative young man, used leftover egg carton pieces to make fun characters for his boat. You can too!
Have fun and enjoy sailing the high seas... or your backyard pool!