PropellerSafety.com

Archive for November 2011

This design project is a self contained, self powered, warning module that lights or blinks LED lights off the stern when the outboard or stern drive engine is running to warn people in the water to stay out of the propeller danger area.

Earlier today (30 November 2011) we posted coverage of Mercury Marine’s new Moving Propeller Alert System that plugs into their CAN-bus SmartCraft system to alert those in the water the drive is running in neutral, or the propeller is turning. When we saw retrofit costs for parts alone were $315.68 per drive we started thinking about a more economical, self contained module that could work for single or multiple drives.

We propose further design by students as Senior Design Projects, Sr. Thesis, Industrial Design, and Capstone projects of a rugged, economical, self contained version of Mercury’s Moving Propeller Alert System that could monitor one or more engines/drives from a single module and offer suggestions for same. Read More→

2 Categories : Research Projects

After reading the negative comments left on hundreds of propeller accidents reported in the media, we see some common themes. We thought we would make a check list so readers could just select the ones they want by topic. We have seen all these before. The phrases in quotes are direct quotes from their posts. Read More→

Mercury Marine has been talking for some time about developing a system that uses lights to alert people in the water the propeller is turning. That system has now been released as the Moving Propeller (MP) Alert System.

A four inch light at the stern contains six amber colored LEDs. When the engine is started, they begin to flash, then they remain lighted. When the drive is put in gear the lights begin to blink in a rotating pattern similar to the rotation of a propeller. Read More→

1 Categories : New Products

The boating industry continues to reject the use of propeller guards and vehemently testifies against them in propeller injury trials. One of their tools is to illustrate ANY changes in the performance of the boat with the guard vs. without the guard and claim those changes are unacceptable.

We propose a Senior Design Project, Capstone Project, or Senior Thesis in which students develop a propeller guard that provides at least some level of protection while absolutely not changing the performance of the boat and not causing any other unintended consequences. This Senior Design Project might particularly appeal to student in mechanical engineering students, marine engineering, ocean engineering, design, CAD / computer aided design, safety, or law.

In real life, propeller guard designers design guards to maximize protection while minimizing the guard’s impact on the performance of the boat. They typically end up with a prop guard that provides good protection, but one or more element of boat performance is at least measurably impacted (top speed, time to plane, handling, steering, performance in reverse, durability, increased potential area for blunt trauma, entrapment in the guard, fuel consumption, emissions, porpoising, draft, weeds/sea grass, ability to speed to shore after an accident, cavitation, etc.)

Guard designers think it is a very good tradeoff (get great protection but boat goes a couple miles and hour slower, etc.), however the boating industry uses that delta (change in one or more boat performance variable) as a reason to reject the propeller guard. Read More→

0 Categories : Research Projects

Boat propeller guards create drag which effects the performance of the boat, especially the top speed attainable at wide open throttle and time to plane. Propeller guard designers try to minimize drag by increasing the size of the mesh (make the open holes larger) and by decreasing the size of the wires / rods used to construct the mesh. However, those actions begin to reduce protection provided by the propeller guard, its rigidity and its strength. Prop guard designers make these tradeoff without an in depth understanding of all the variables involved.

We propose further research by students as Senior Design Projects, Sr. Thesis, Masters Thesis, and Capstone projects on the drag created by the components (meshes, screens, wire, rods, struts) used to construct propeller guards in clean flows and in the turbulence present in their operating environment. Read More→

0 Categories : Research Projects

USCG published an advanced notice of proposed rulemaking (NPRM) for Recreational Vessel Propeller Strike and Carbon Monoxide Poisoning Casualty Prevention, USCG-2011-0497, in the Federal Register on August 26, 2011.

The deadline for public response was November 25, 2011.

The U.S. Coast Guard sought comments on specific measures to protect recreational boaters in the water at the stern. Similar to the earlier Kill Switch NPRM, it asked a large number of very specific questions. Read More→

0 Categories : Regulations

Follow Us On TwitterThis post is part of our coverage of the Listman v. OMC propeller injury trial

Robin Listman vs. Outboard Marine Corporation
Second Judicial District Court of the State of Nevada, County of Washoe

18 November 2011 Session One Read More→

0 Categories : Listman vs. OMC Trial

Follow Us On TwitterThis post is part of our coverage of the Listman v. OMC propeller injury trial

Robin Listman vs. Outboard Marine Corporation
Second Judicial District Court of the State of Nevada, County of Washoe

18 November 2011 Session One Read More→

0 Categories : Listman vs. OMC Trial

Follow Us On TwitterThis post is part of our coverage of the Listman v. OMC propeller injury trial

Robin Listman vs. Outboard Marine Corporation
Second Judicial District Court of the State of Nevada, County of Washoe

18 November 2011 Session One Read More→

0 Categories : Listman vs. OMC Trial

Follow Us On TwitterThis post is part of our coverage of the Listman v. OMC propeller injury trial

Robin Listman vs. Outboard Marine Corporation
Second Judicial District Court of the State of Nevada, County of Washoe

18 November 2011 Session One Read More→

0 Categories : Listman vs. OMC Trial