the rudder on my daysailer 3 has a line attached to the rudder that runs from the tiller to the rudder that allows the rudder to swing up and down..it has a set cleat that you can engage the line in to prevent the rudder from swinging up..on the mercury i learned on the rudder stays down by itself..what's thepurpose of this line..if i disengage it the wooden rudder swings up and floats in a horizontal position..i'm new to sailing so please excuse the stupid question..can i sail the boat with the rudder in the up position or does the rudder have to be submerged..when i switch sides when tacking or jibing i sometimes feel the need to raise the tiller to give me room to make the switch but if i lift the tiller with the line tightened it's near impossible to do that since the line is cleated tight to keep the rudder down..