In your case you only need a flat rudder. Something about 4″ wide and that extends into the water 7″ or so would work fine. That would probably mean 3 to 4 inches below the bottom of the boat.
What is the point of a rudder on a kayak?
Believe it or not, the main purpose of rudders or skegs isn’t to turn a kayak, it’s to keep a kayak running straight when you’re paddling with a crosswind. A kayak will naturally want to turn into the wind, something called weathercocking. A rudder or skeg is used to fight your kayak’s desire to do so.
What length should a kayak paddle be?
Kayak Paddle Sizing Guide
|Kayak Width||Under 23″||28″ to 32″|
|Paddler Height||Recommended Paddle Length|
|Under 5′||200 cm||220 cm|
|5′ to 5’6″||210 cm||230 cm|
|5’7″ to 6′||220 cm||230 cm|
What makes a kayak track straight?
Deploy the skeg or rudder when winds are pushing the kayak from the rear. Tail winds push the kayak around, making it hard to track and stay in a straight line. Push the rudder slightly to the opposite side the kayak is being blown. Use slight paddle strokes opposite the rudder to maintain an even track on the water.