STEM Challenge #58: Cable yachts

Sun sparkling on a blue sea, waves lapping on the shore, and triangles of white sailing across the scene. It’s lovely! But… you’ve had an hour or two to admire it and you want something else to do. Why not try making a yacht for the beach?

Now a model sailing vessel is a tricky thing to sail through waves breaking on the shore. And a sand yacht needs a big area of flat sand and big wheels to cross the sand, so that’s tricky too. Instead, try out the Cable Yacht, a yacht that sails down a wire in the air…

You’ll need pulleys, some wood or Meccano, 20 or 30 metres of washing line or other thick string, a small weight, and something to make a sail with. Mount the pulleys so that if the yacht bobs up and down a lot, it’ll stay running on the pulley: you can even use a pair of pulleys, one above the other, to do that.

Mechanics behind cable yacht experiment ...