Does a tumblehome hull become unstable when flooded?
Short answerA modern tumblehome design is not considered inherently unstable because contemporary engineering can mitigate earlier limitations.
NotesA tumblehome hull is not treated as inherently unstable whenever it floods. Modern stabilization systems can control behavior that earlier designers had fewer means to manage. Improved metallurgy also changes what shapes can be built safely. The ramjet and scramjet comparison makes the broader point that an old idea can become practical after materials catch up.