I was down my local Hobie centre today and I was after a sailing rudder to upgrade the standard item on my Outback. He didn't have one in stock, though I was given an older style tandem rudder (I believe) to try FOC. It fits a treat, though is a couple of inches longer than the sailing rudder. It raises and lowers just fine without undue effort. So what do you reckon?, too large??. I could trim is down and profile it if required. I've only just fitted it and not tried it on the water yet, though I do have a sail kit and intend to sail it from time to time.
Standard rudder
Sailing rudder
Tandem rudder