Propeller warning placement on boat at 2013 Tulsa Boat Show. Is on the transom in tight to the jack plate below a carbon monoxide warning.
Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC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