Kayaking Technique Forum

Find advice on all aspects of kayaking and using small boats on big water

And they say a rudder is a drag

My ? is how much of a drag does a feathercraft rudder produce. An accomplished racer suggested I retract the rudder when not needed. So on a 5 mile flat course if it took 40 minutes with rudder in the water what would be the time(assuming able to maintain straight without rudder) if the rudder is not in the water?