added floater 2 on hull 1 the stroke h is achieved by the cylinder 16 which is attached to the parallelogram 19 and is fixed to the hull 1 the cylinder 16 can be controlled manually or by a controller 17 which sets the stroke position on stroke h by speed gauge 20 or rpm gauge and other sensors fig7 shows a schematic sideview of a hull 1 with a rear added floater 2 for better comprehension the deadrise has been omitted for technical drawing reasons instead of fixing the added floater 2 higher which means stepped onto the hull 1 a of the watercraft shows first a firm link element 5 a on hull 1 whereby the co bottom 5 b is put on the same level as hull bottom 6 so as to connect both parts more securely to each other so that as for eg by race events these can withstand the high forces while wave jumping but also shipyards that modify their watercraft with regard to the installation or fixation of the added floaters 2 can also take the opportunity of extending their hull 1 so as to have an even larger model this can be accomplished at a reasonable price by installing the added floater 2 and the link element 5 a also enables a permanent connection to the other added floater 2 on the opposite side fig8 shows.