Next version of the kick-up T-foil/winglet rudder.
In this version the vertical rod rotates 90 degs to engage/disengage the foil/winglet axel. The vertical rod (red) has a flange that engages a notch in the horizontal axel of the (blue in drawing) winglet. The Boyer-type kick-up rod (black) forces the the vertical rod in engage position when the rudder is in down-position.
When the rudder is lifted or kicks up, the kick-up rod releases and the vertical rod rotates (elastic pull) and this in turn moces the flange out of the notch. Hence the foil/winglet is free to move with the water flow.
