PropellerSafety.com

Archive for Research Projects

Log Strike Test System designed by student in Sweden: Fredrik Helgesson

A college student in Sweden, Fredrik Helgesson, designed a test stand to log strike test outboard motors (outboard motors impact floating logs). The report is titled, Konstruktion av “log strike”-testrigg for utomboardsmotorer. Back in early 2016 Mr. Helgesson, a mechanical engineering student at Halmstad University in Sweden, contacted us a few times for technical specifications […]

Boat Propulsion Impact Relief System: University of Cincinnati thesis

A few months back we came across a 2015 thesis targeting preventing outboard motors and stern drives from breaking off and flipping into boats when striking submerged objects: Boat Propulsion Impact Relief System Baccalaureate thesis College of Engineering and Applied Science University of Cincinnati Mechanical Engineering Technology Jared Frizzi 30 April 2015 We congratulate Mr. […]

Mercury Marine’s & OMC’s Propeller Guard Development $

The two major U.S. recreational marine drive companies of the past many years: Brunswick / Mercury Marine and Outboard Marine Corporation (OMC) have been in the forefront of “debunking” propeller guards in court since the 1970’s. In this post we estimate their total expenses in developing propeller guards designed to protect people at less than […]

Modeling Boat Motor Log Strikes – A Senior Design Project

The boating industry has long been aware that marine drives can strike submerged or floating obstacles. In the early days they conducted on water log strike tests. In more recent times, some have moved to dry land impact tests (log strike test stands), and even considered virtual log strike tests (computer simulated log strike tests). […]