Hi Luiz,
I like this scheme better than the pump handle one but this one still has problems. 1. When the rudder is kicked up, the leading edge is 4 inches, or so below the keel; not good. It is still on the rocks or in the sand and mud.
2. For a rudder to be properly balanced, about 20% of the rudder area needs to be in front of a vertical axis passing through the pintles. 3. Ropes stretch, so the line holding the rudder down will stretch at speed and this will let the rudder swing aft slightly and the 20% rudder balance area is lost. A mechanical locking scheme works better with a breakaway spring system to release when grounding. What's wrong withg the SC system? It meets all functional requirements.
Bill