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Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC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