im neither a rocket scientist or a hydrodynamics engineer and can only base my suggestion on my education at hobie 101 thru 440 check the rudders angle and attitude. I had too much weather helm and a 1/4 inch adjustment on tiller made me a beliver in "there is a right way to do everying".
The reason is because of the raked angle of the transoms. You have to figure out a way to make your blades be at a 90-degreee angle - straight up and down. Randy suggested making a wedge piece that you could afix to the transom, that the rudders would attach to. The other thing you could do is straighten out the transoms, if you're handy with fiberglass.
Easy enuff - re drill the pivot hole. Set the boat on the trailer and get it so the water line is level Drop the boards and see where they are in relation to the hull. A level will get you to perpendicular. If you can not get to perpendicular remove the bolt holding the rudder Keep the lower part of the blade against the casting and move the top until perpendicular is achieved. Mark the blade thru bolt hole in the casting with a sharpie and drill. Go sailing to check progress If it works for you then fill old hole with epoxy and your done.
-- Lee - On the BIG Lake in MS
Harstil Kaulua 31 - Current Project Boat
Cal 25 - What ? Time to freshen it up again??
MC Scow 16 (1 in the water and 1 parts/project) SOLD
Capri 22 - What do you mean you wont deliver it??
Chrysler Pirateer 13 - new addition to the fleet --
Is there just one pivot point on the rudder, it is hard to tell without seeing the whole rudder casting, the rudder almost looks like a Prindle rudder. Can you post a picture of the casting and how it attaches to the transom showing the gugdens
Hey guys, is it just me bad eyes or does it seem to you that rudder is on backwards? the thick edge of the rudder is supposed to be the leading edge and the thin edge is the trailing edge, in those pics it looks the other way around, might just be a bad angle ....
well i only had the boat since Nov.2011 so i put it back the way it was in summer , and the rudders do kick up if i hit something so if it is then backwards then the guy i bought it from had them backwards too!
I think its a poor desgin rudder from 1980 ! i would like to make some but i never did before i was going to trace these ones, then make it a little thinner! I have no idea what i am gonna do right now its cold here and i cant function! :) I wish i had a huge garage to work in i wanted to have the boat all put together and back it into a nice warm garage! But that is just a Dream.
Do a quick check and see if the leading edge is thicker than the trailing edge, could be that is your whole problem, the rudders work just like the wing on an airplane, thick edge points in the direction of motion.
i don't know if i understand those numbers and this rudder is leaning to further stern it seems, i need it to go toward the front under boat i think a little?