I would like to say Thankyou guys!
The Floating batteries are made accourding Dutch planes from 1862, Only one got a Steamengine the other would have sails of the midmast from the Ships of the line, basical the Floating batteries are stripped and modfied hulls of the battleships. The Dutch wanted to let ''sunk the navy'' to a Ironclad level, no sail rigging ships would be built. But the idea was not really come out though!