If you are looking for a specific book titled "Architecture navale – connaissance et pratique" by a particular author (e.g., Dominique Paulet, Marc Bihan-Poudec), that book is likely under copyright and not legally available as a free PDF. You may find it through:
Hydrostatique, stabilité et flottaison ("Comment ça flotte ?"). Dynamique : Hydrodynamique, résistance à l'avancement et propulsion. Structure et matériaux : architecture navale - connaissance et pratique pdf gratuit