We built two new types of ships (Doppelschrauberschiffe???) by order of the Water and Shipping Directorates Centre and East which were tested as models for a use in shallow waters. These tests were carried out by the experimental station of shipbuilding in Duisburg. The results were published in the report 1560/ preliminary version (June 2000) by the Development Centre for Ship Technology and Transport Systems.
Following pictures show the ship during the experiment: