Rounding up is caused by many factors. One is too much wind and force aloft which tends to heel the boat over. This reduces the amount of rudder in the water and thus the rudder's effectiveness. Another factor in rounding up is that the centre of pressure of wind on the sails is too far aft. This then pushes the aft of the boat downwind and thus the front of the boat upwind. Our SailTrim clinic discusses this topic and so what we wanted to do was test it out for sure. So last weekend we took out a friend's ...