Boats or boat motors often strike dredge pipes causing damage to the boat or drive. A list of these struck dredge pipe accidents. small jpg version of a larger pdf chart.
Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC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