Thank you for the information. I too have hit the prop with the rudder and had to repair the gouge.
The question is now unimportant as I hit something with the rudder leaving our canal into the river. This caused the rudder to jump off of the bottom pin and bent the top. Minor repairs ensued but entering our river with the rudder on is now unadvisable.
Thanks against for the information. I have read several of your posts and replys and you seem to possess a wealth of information on the Cal 21.