Homemade aluminum water-jet fishing boat exfoliation failure

Maine builder constructed a water-jet-propelled aluminum fishing boat; seawater velocity-driven exfoliation destroyed the hull within six months. The second of Tom's two personal exfoliation cases.

The other one I saw was a guy who decided to build his own — what's that propulsion called? — water jet pump. Jet-powered, where you don't have a propeller, you just pump water out of the back end. So this guy up in Maine decided to build his own fishing boat with a water jet pump, and he decided to make it out of aluminum, and he had enough velocity coming through that water — it's seawater — that he ended up with exfoliation. The hull came apart within six months. So changing velocities and things like that, you can set up different potentials, and exfoliation can occur. He could have used something else when he had that problem.