⛪ Gothic Cathedral Flying Buttress: Vault Thrust Line, Wind Load, Pinnacle Ballast and Pier Stability

A cross-section of one Gothic nave bay: the vault pushes the walls outwards, wind adds to the load, and a flying buttress carries the thrust to a pier. Watch the line of thrust, the middle third of the pier base, the pinnacle ballast and a storm test that finds the collapse wind speed, with six in-page numerical checks.