I had different supplies that they could use to make the sail. Materials included: construction paper, card stock, tinfoil, tissue paper, and fabric. They designed their sail and then glue it on a toothpick(s). The toothpick was stuck into the bar of soap. Remind your students to write their name on their sail.
On sailing day, it is helpful if you have parent helpers because this can be a messy experiment. Put ships in a ziplock bag when you finish sailing. Make sure students wash hands thoroughly so they get all of the soap off of their hands when you are done.
I sailed my ships in a small child’s wading pool like this one: