Bill Crealock designed his boats with deck stepped (tabernacle) masts as does Kai Gustafson of Nauticat fame. These masts were not meant to be lowered under bridges. A well designed deck stepped mast has great integrity.
ISPA Yachtmaster Offshore Instructor Evaluator
CYA Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
As I sail, I praise God, and care not. (Luke Foxe)