%%%%%%%%%%
There is drag and you can feel it 2% i doubt I could feel. I have a Current Design Nomad, Solstice, and Libra XT 21-4" tandem. I can feel the glide is better with the rudder up what the percentage is not sure. You feel it paddling also. These are the stock CD rudders not the smart trac. Don’t like the way they stick up and drag in the water.