Page 38: of Marine News Magazine (May 2013)

Overall length: 11.99 metersDraft: 0.70 metersMax speed (3 p): 34 - 36 knotsLength hull: 10.46 metersWeight empty: 7700 kg Engine: Yanmar 4LY3-STP 440 HP Breadth extreme: 3.5 meters Davit Load (10 p): 8525 kgAlternative: Volvo Penta D6-435 Breadth hull: 2.29 meters Approved lifting: 12000 kg Propulsion: TWJ HH431 Technical data ? MP 1111 FRDC and will be used for streamer cable replacements. The boat is powered by twin 295-horsepower (hp) Yanmar diesels paired to twin TRAKTOR Jet TJ 381 (15-inch) waterjets capable of propelling the 31-foot, 15,653-pound (7100 kg) craft to top speeds of 28 knots. In addition to its im- pressive speed, the vessel?s TRAKTOR Jet propulsion sys- tem also provides 6,393 pounds (2,900 kg) of Bollard Pull. When the initial design of the vessel began in September of 2011, the builder realized that Westplast?s unique hull design and performance characteristics would require sev- eral custom modi cations to NAMJet?s TJ 381 propulsion platform. ?The hull design required us to shorten the TJ 381s by six inches,? said NAMJet General Manager Jim Ducker. ?We also custom-designed a water pickup system, intake knife system, and shaft tube protection system. Fi- nally, we added a grease-lubricated bearing pack that al- lows the system to be run even if it?s out of the water.? The Westplast has to be deployed at speeds of as much as  ve knots; hence the ability of the vessel to get away from the mothership quickly and safely is critical. To do this, May 201338 MNMN May2013 Layout 32-49.indd 38MN May2013 Layout 32-49.indd 385/3/2013 12:56:41 PM5/3/2013 12:56:41 PM