Hello my friend @vcelier the truth that those tests that were made to Tourville in the middle of the trip in the sea should have been very exciting, for example stopping a boat 150 meters long in less than 450 that should be surprising, even more so the men who had to be in the propa and in the prow, although I would have scared a little when at the top of the mast the terrifying noise was heard hahaha! The Tourville was equipped with those four stabilizing fins, I imagine it was a great investment to build this boat!