Our kids love an engineering challenge. We decided to run a sail car competition, prompted by this instructable. I showed kids some images and a trial one I’d made as inspiration and then gave them a pile of paddle pop sticks, straws, sheets of paper to act as sails, rubber bands and sticky tape to experiment with and make their own design. The designing, trialing and re-designing is where all the learning takes place – as well as the fun. For wheels, we used plastic cotton reels that our Kindy had as part of a threading kit.
When each group had created their sail car we tested them to see which one could travel the length of a desk the fastest, using only the power of their breath to propel it.