Image of propeller guard in arm supplied by Kelly Kennett in Robin Listman vs. OMC propeller injury trial. Video of shot included improper discussions of test crew.
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Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC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