Propeller guard test Dummy used in 1990 Mercury Marine and OMC testing. This image is from a paper on those tests in the SAFE Journal Vol.24 No.3.
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Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC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