Plastic canoe kayak manufacturers tell you that each kayak can have a rudder. The thickness of K1 and K2 rudder blades shall not exceed 10 mm; or K4 shall not exceed 12 mm; the boat may be designed as an inboard type (kayak type) instead of an external type (surfing and water skiing type).

The kayak rudder is an accessory device on the kayak. It is a simple device to control the direction of the kayak, including rudder blades, steering wheel, rudder rope, rudder stock, etc. The manufacturer of plastic canoe kayak tells you that the rudder stock objectively exists on the athlete's pedal board. When the athlete paddles, his feet rest on the pedal board. When the kayak needs to turn, he uses his foot to move the rudder stock. The rudder stock surrounds a fixed axis rotation. When the "T"-shaped rudder stock turns, the rudder rope is driven and the steering wheel connected to the other end of the rudder rope is pulled. The steering wheel is tightly connected to the rudder, so the rudder rope actually drives the rudder blade to rotate, thus The kayak turns.
The rules of the competition stipulate that: the manufacturer of plastic canoe kayak tells you that if the length of the kayak’s hull is lengthened due to rudder installation, the thickness of the rudder blade must be limited. Leaf thickness must not exceed 12mm.