In the post regarding "double enders" it is shown via a sketch that the RHM pendulum in some cases will not work. For Pete I made a sketch which may be a solution to the problem.
The rudder head has to be extended, so that an arm X is available of about 0,4 m. That extension incorporates the horizontal pendulum axis, which is now lower than the rudder head. The linkage can be designed over the rudder head.
To make the angles of the restraint lines more favourable, for each side a strut will be used, which will be attached via a hinge to the side of the stern. When the restraint lines are loose, the the struts hang down. When the lines are tightened the struts will find its own position, which results in a better angle for pulling forces via the restraint lines.
It is an idea and more engineering has to be done, but it looks viable.
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