One of a series of sketches of boat propeller accidents prepared by Lawrence Thibault (an expert witness in propeller cases) for Stephen Bolden (a lawyer) in a 1987 letter.
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Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC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