hola, first of. im not mentally gifted enough to understand math involving letters so if you got a response to the following thread please make it in laymans terms. The invension?... more like an idea. would it be possible to make a double keel hull. (like a catamaran) that would be stable and not cause to much friction if mounted on an identical hull? the idea is such. build boat modules that have the exact same outer appearance and form but that can be modified inside. for instance. 2 of the hulls deal with engines and ventilation and the other hulls can be storage hulls or ballrooms. u name it. in the event of for instance a crash where 1 hull is damaged beyond repair you could simply evacuate that module. disconnect it and let it sink. this is just an idea and i dont know if it has any other uses or if it is even doable. thats why i wrote it here.