The rudder blade is a the flat steel plate which directs the water driven by the propeller in such a direction as to turn the boat. The blade is attached to the rudder stock.
The handling can be fine-tuned even further thanks to Correct Craft’s Tunable Rudder, which allows you to easily correct - or increase - the boat’s pull to the left or right by rotating a small foil on the upper aft corner of the rudder blade. Just don’t try making the adjustment while the engine’s running.