Plaintiff in Robin Listman vs. OMC (Outboard Marine Corporation) presents Man on the Moon but propeller guards are still impossible story.
Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC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