Sun, 11/01/2015 - 12:31pm
I had a similar kind of problem on my 26D although it has only one rudder and an exterior rudder stock. There was enormous pressure on the rudder and stock when sailing close hauled or in a following sea and this caused the damage. I solved the problem by reinforcing the stock, making a new longer rudder slightly angled forwards under the transom and creating a new rudder downhaul system to make sure the rudder went down well and stayed down as there is more pressure on the rudder if it is angled back away from your transom. I can now heel in a good wind close hauled and steer with a little finger, the rudder is balanced with the axis in the middle instead of forward.
Thu, 20/04/2017 - 11:49pm
The rudders on high performance yachts are not absolutely parallel. The hydrodynamic flow near the transom is inward and upward (to fill in the hole left in the water behind the boat). The rudders are aligned with the neutral water flow so have a small amount of 'toe out'.
But at the speeds of a Mac this would be miniscule and anyway would be symmetrical. If yours aren't parallel I can only assume something is bent or has been modified.
Dave Newton Sailbadthesinner