Log Strike Testing of Mercury stern drives on Lake X. Logs were submerged and ran over by Mercury test boat drivers. Note the stern drive in the air. This image has been filtered.
Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC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