The 12 inch unnamed battleship from the 1920's. This uses a very simple copper coil system to drive the boat along. It can travel for about an hour on one filling of methylated spirit , but at a very slow speed. I would estimate that it travelled at no more than one mile an hour maximum. Only suitable for very calm boating pools. I have seen this boat in all grey and all khaki colour schemes as well. A lovely boat to set sail on your paddling pool and watch it sedately and quietly trundle around the pool.