Wow, Texas80. I liked my rudder system a lot better before I saw yours. Mine definitely needs at least a paint job. You might incorporate a couple ideas from my system into yours. Here's a pic in the up position.
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I use a bungie cord to keep it in the up position until I want it down. Then it only takes the movement of one cord to lower the unit, as follows:
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Another idea incorporated was the use of a "stiff" steering system. I used fiberglass tent poles cut to size and placed on ONE SIDE ONLY of the pivot. Then a stiff rod attached to a pulley system on one side of the kayak to turn it both ways.
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The advantage of the stiff steering system is the small pulley system required. I opted for a larger rudder for the addition of a small sail. I used the rudder in the bay and in the Gulf a short distance and it worked great with a large umbrella. The rudder also helped keep me pointed in the desired direction when anchored. I broke the bottom of the rudder off loading it onto the Jeep.