Grip Strut safety grating. Image courtesy of Eaton. Possible pontoon boat bow walkway material to prevent sitting on it (bow riding).
Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC
History of Boat Propeller Safety
Mitigating Boat Propeller Injuries & Fatalities Chart
Four Volume Review of the Boating Industry’s Boat Propeller Guard Product Liability Defense