By Michael O'Donnell 13 Sept 2020 Next time you’re doing a sailing course, or simply taking a walk by the harbour and boat yards, take a look at the tell-tales on the sails. They look like small red and green shoe laces at points on the sails that dangle and flap in the wind. They look fragile and pointless. In fact they’ve an important function that helps the crew trim their sails correctly, to maximise the efficiency of the sails – reducing the turbulence that causes the sa