Rooster tail formed by exemplar propeller guard in up position in Robin Listman vs. OMC (Outboard Marine Corporation) boat propeller injury trial.
Aspects of the Propeller Safety Debate chart
Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC
History of Boat Propeller Safety
Mitigating Boat Propeller Injuries & Fatalities Chart