RINA Launches Sailing Rig Guidelines

RINA
Monday, October 08, 2012

International classification society RINA has developed guidelines for yacht sailing rig analysis, manufacturing and maintenance. The scheme includes full certification of the rig and a verifiable planned maintenance scheme.
Paolo Moretti, General Manager Marine, RINA Group, says, “This is a new approach to a challenging engineering problem. Until now, sailing yacht classification has focused on the hull and machinery. We think that this is illogical, as sailing yachts depend on their rig. So we are extending class service to cover the rig, from plan approval to in-service regular surveys exploiting the results of an innovative dynamic strength analysis. We see strong demand for this from the increasing number of large sailing yachts built for charter and commercial use, and from flag states that need our expertise to oversee the rig properly. But it is not just for commercial charter yachts, this is for any yacht and we know many private owners want to extend classification to cover this vital part of the yacht.”
The new guidelines for sailing rigs have been developed using a bottom–up philosophy, studying rig failures and researching relevant solutions to achieve cost-effective reliability improvement. A database of recorded dis-mastings has been examined using reliability engineering methods. Typical failure modes have been determined. High-risk priority items have been identified. Ad-hoc dynamic strength analyses have been calibrated and actions have been taken to achieve a significant reduction in rig failure rate.
Moretti says, “We class more yachts than anyone and we have long experience with yachts. We have learned, for example, that a high percentage of dis-mastings are associated with standing rigging failures. As with every complex system, failure rate of sailing rigs usually depends on time, varying over the life cycle, and insufficient knowledge about the rig response to the at-sea behaviour of units, sometimes coupled with lack of proper maintenance, is one of most common root causes of failures. In many cases, captains and crews are not aware of critical information relevant to their rigs and this often leads to wrong sail reduction manoeuvres that overstress the system. As far as the mast calculation is concerned, wave-induced inertial loads are sometimes of the same order of magnitude as aerodynamic loads and have to be taken into account during rig design. Our analysis criteria address those issues and we believe this is a unique service which will see a very high uptake.”
Under RINA requirements for sailing rigs, critical rig items will be surveyed and tested under surveyor attendance. A planned maintenance scheme will be required, and scheduled periodic surveys will be witnessed by class surveyors, supported by approved manufacturers as required. To support the crew and captain, RINA will approve a rig booklet giving guidance for rig maintenance and handling. A feasibility study for onboard accelerometers has been carried out to be used for crew guidance and data recording purposes.
One of the central aspects of RINA certification will be the use of a dedicated computational tool that has been developed to support rig structural design. This software, based on CFD and FEM analysis, is the most advanced in this field and also facilitates the calculation of inertial loads due to hull motion in severe weather conditions.
Owners and yards may opt for different levels of certification schemes. Rig plan approval is available as a stand-alone service. Rig type approval is available for CE yachts under 24 m. There is an additional class notation for yachts L>24 and a mandatory class notation for sailing charter yachts. These are backed by periodic class survey, outfitting testing and type approval certification, manufacturer-certified quality assurance, and manufacturer-certified planned maintenance schemes and certified compliance to statutory requirements.
RINA currently classes over 1,250 yachts and is supervising over 200 newbuilding yachts.

 


Technology

NASA May Send Submarine to Titan

NASA has unveiled plans to send a submarine into the depths of the largest ocean of Saturn's biggest moon, Titan in a bid to explore the depths of its largest ocean.

Scorpene Submarine Data Leak: Setback to Indian Navy

India has began multiple investigations to determine the extent of damage caused by the reported massive leak of secret data detailing the combat and stealth capabilities

NOAA Engineers a Better Current Sensor for Mariners

Navigating into seaports is now safer and more efficient for mariners thanks to improved NOAA technology that ships rely on to give them information about currents.

Shipbuilding

STX to Slash Jobs, Sell Yard

To stat above water by restructuring, South Korean Shipbuilder STX Offshore & Shipbuilding Co. plans to lay off about a third of its workforce and sell a yard in France, says a report in WSJ.

Michelle Obama Sponsors Attack Submarine

General Dynamics Electric Boat has delivered to the U.S. Navy an attack submarine that is sponsored by first lady Michelle Obama and will be named for her home state, reports AP.

Croatia’s Jadrolinija to Buy New Passenger Ship

Croatia’s  largest national passenger shipping company Jadrolinija plans to expand its fleet with a new passenger ship, with the total cost of about 50 million euros, reports Poslovni.

Naval Architecture

MV WERFTEN, Foreship Sign Design Agreements

MV WERFTEN signed a letter of intent with the engineering company Foreship in Stralsund today. The agreement includes parts of the basic design as well as design,

Zumaia Offshore Acqires MPP Workboat Aitana B

In April 2016 Zumaia Offshore, S.L., leading workboat owner and operator based in the Basque Country, took delivery of the Cummins-powered MPP workboat “Aitana

C-Job Designs Flettner Freighter for Switijnk

The Dutch shipping company family Switijnk has contracted C-Job Naval Architects to develop a Rotor Sail-equipped design to meet their specific loading and sailing profile.

Yachts

MV WERFTEN, Foreship Sign Design Agreements

MV WERFTEN signed a letter of intent with the engineering company Foreship in Stralsund today. The agreement includes parts of the basic design as well as design,

Lucas Marine, Harbor Breeze Cruises Partner to Cut Fuel Costs

Lucas Marine is partnering with Harbor Breeze Corporation to help reduce the yacht charter and cruise company's fuel costs, maintenance and environmental impact in Los Angeles and Long Beach Harbors.

Gulf Coast Shipyard Delivers MY Imagine

Gulf Coast Shipyard Group (GCSG) has delivered the Motor Yacht Imagine.  The M.Y. Imagine, a Trinity built yacht, is a 193’x 32’x 14’6” custom designed semi-displacement

 
 
Maritime Contracts Maritime Security Maritime Standards Naval Architecture Navigation Offshore Oil Port Authority Ship Repair Ship Simulators Shipbuilding / Vessel Construction
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.0828 sec (12 req/sec)