Researchers from medical institutions in Alabama, Manitoba Canada, Washington, and New York collaborated on this study. Watercraft and Watersport Injuries in Children: Trauma Mechanisms and Proposed Prevention Strategies. Towed tubing was the most prevalent form of accident treated and resulted in higher injury severity than other types of boating accidents involving children.
Two female patients underwent partial lower extremity amputations after propeller accidents.
Mandatory wearing use of protective gear such as helmets, life vests, and easily visible floatation devices by children. We commend these researchers for calling attention to children being injured while tubing and to children being struck by boat propellers. Their paper surveys Florida Orthopedic Society members about the number of propeller injuries they encountered from 1979-1983. Hemant Garg MB BS, Reto Twerenbold MD, Rene Zellweger MB BS MD FRACS of the Royal Perth Hospital in Western Australia published a paper in 2011. The article reviews the cases of five patients seen over the 2010-2011 Christmas holiday in Western Australia. Every few years medical professionals speak out for preventing contact with exposed propellers, but nothing is done about it. This patented vibratory stress relief and weld conditioning equipment and process far more nucleation centers than conventional welding.  This results in the uniform formation of many smaller grains in a given weld volume.

Hike Metal utilizes this patented process on all aluminum welded work boats regardless of size.
If you manage this site and have a question about why the site is not available, please contact us directly. While it was not one our student projects, we elected to include it in our Research Projects category hoping it might encourage student researchers to work in this area as well. Before you purchase or view a copy of the actual study, we encourage you to think about what trauma means. We posted our coverage of water visibility issues in July 2013 after the Mansour accident to encourage college students to select class projects in this field. These efforts were met with either resistance or reluctance on the part of boating representatives to get involved. Hargarten’s letter strongly urges the Coast Guard to promote the use of propeller guards. Zielinski, Vice President and CEO of Samaritan Health System, Lake Havasu City, Arizona (near Lake Havasu) responded to a U.S. Coast Guard National Boating Safety Advisory Council (NBSAC) in San Francisco, California on April 29, 1996.
We can only hope that the recent paper about children water-associated trauma is better received.
More often than not, the repairs require dry-docking and replacement of major sections of hull plating and structural members, not to mention the out of service down time.

The patented process significantly improves the mechanical properties of the weld which ultimately reduces cracking through the stress relief, produces less distortion and porosity while at the same time reducing panel distortion and providing a more appealing fair hull form.
The study includes several color photos of children injured by boat propellers that are not for the faint of heart. Coast Guard request for public comment on a proposed houseboat propeller safety issues in a June 13, 1995 two page letter to which he attached a paper he co-authored titled, Motorboat Propeller Injuries in Wisconsin: Enumeration and Prevention.
Coast Guard request for public comment on houseboat propeller safety issues in a July 10, 1995 two page letter.
Medical Director of Emergency Department and Trauma at Mercy Medical Center Redding California (near Lake Shasta), a level II Trauma Center, responded to the U.S. Coast Guard request for public comment on houseboat propeller safety issues in an October 17, 1995 letter.
Gorovitz noted the then current position of the courts recognizing Federal Pre-emption of the 1971 Boating Safety Act was preventing consumers injured by propellers from seeking redress in the courts.

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