this is a boat that i have been chasing for four years, waiting for the price to be right and it has reached my range as it will have to be trucked to my shop, some 700 miles. isent request to the broker about the keel, he did not have a clue, and im due to be there in two weeks and would like to know what to look for and if it is working properly. thanks for a starting point, lets see if there is some more info out there
You could try boatdesign.net
You may get 200 opinions about how effective it is, or effective at all.., wonderful or terrible,...etc... I wouldn't worry about it so much. Just so it doesn't leak, is structurally sound etc. You could just lock it and glass it in if you wanted to.
Personally, I think it could be a nice feature. You may be able to use it to balance the helm for different conditions. I would love to see some pictures of it, if you can get some. From the drawing, it looks you need to go below to adjust it. Are you sure that all Coronado 30's actually have this thing? It could have been an option. It would have had to add considerably to the expense of the boat.