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
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203, 204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)