Rudder upgrade and rudder down control line would be two things to be sure you have. There should not be that much load of your steering control to cause an issue.
Two items from our Island FAQ area:
http://www.hobiecat.com/forums/viewforum.php?f=114mmiller wrote:
Product technical change - Rudder Up/Down system for 2007-08 Adventure Island and '08 Adventure
We have been looking very hard at better ways to secure the rudder in the down-position on the Adventure Island when sailing at speed. The higher sailing speed of the Adventure Island can cause the rudder to move somewhat from the down position when depending solely on the control handle and line adjustments. When the rudder moves from the fully locked down position, it can cause reduced steering control. To prevent this, all Islands have included a thumb screw, located in the rudder system, to lock the rudder down. This required you to leave the rudder down at all times.
At the time of the 2008 product release, we were not comfortable with further options. A solution was finally settled on to assure proper rudder control and the ability to raise and lower the rudder from the cockpit. We then decided to convert the 2008 Adventure and Adventure Island rudders from this point forward over to a line and cleat control system. This is somewhat similar to what is used on the new inflatable products. This new system can also be retrofitted to all earlier Adventure Islands.
While not as important for rudder control on the Adventure kayak model, the hull is the same as used for the Adventure Island. Therefore, a change to the mold that removed the control handle means that all Adventure hulls will also receive the new rudder control system.
UPDATE 1-22-2008!!
We have been so impressed with the better function and improved sailing experience using the 2008 Adventure Island rudder up/down control system that we are now extending the free retrofit program to the 2007 model Adventure Islands (2007 model owners previously had to pay for the upgrade). Consumers are also eligible for parts and installation labor credits on kits previously purchased or installed by a dealer.
Affected boats have 2007-08 serial numbers, were built and shipped prior to September 25, 2007. Newer boats have the new control system installed by the factory.
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What the system is - The 2008 line control system is internal and exits the hull in the cockpit just forward of the mesh stowage pockets. The down-control line (located on the right side) uses a cam cleat to securely lock the rudder down. The up-control line is located on the left side of the cockpit. Once the lines are released, a shock cord system retracts the lines back into the hull. The system is very clean looking and is easier to operate than the existing control handle. The ease of deploying and retracting the larger sailing rudder is much improved.
To work the system, simply lean slightly forward to grasp the down-control "T" handle on the right side of the cockpit and pull. Add additional tension, if required for higher speed sailing, and cleat. Store the down control "T" handle and excess line in the mesh stowage pocket if desired. To raise the rudder, release the down line and then reach to the left side for the up-control line. Pull until the rudder is retracted onto the deck and then release the line. The slacked lines retract back into the hull and the rudder remains stowed on the deck.
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# 81391002 RUDDER UP/DOWN LINE SYSTEM '07-08
This will upgrade '08 Adventure and '07-'08 Adventure Islands to the 2008 rudder up/down control system (Program does not include 2007 Adventure).
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Matt Miller
Director of Parts and Accessory Sales
Hobie Cat USA
mmiller wrote:
# 81397001 "Balanced" Large sailing rudder for Twist-n-Stow
Available at no charge for all AIs produced before this became standard this spring. Hobie AI production / shipping included this rudder since mid-May 2007.
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