Stern Landing Vessels. By: Stuart Ballantyne. Sea Transports Solutions Stern Landing Vessels (S.L.V.) have carved a niche into the small ship market, opening significant opportunities for builders and operators of passenger, utility, container, roro, bulk, AHTS and PSV vessels. - PowerPoint PPT Presentation
By: Stuart Ballantyne. • Sea Transports Solutions Stern Landing Vessels (S.L.V.) have carved a niche into the small ship market, opening significant opportunities for builders and operators of passenger, utility, container, roro, bulk, AHTS and PSV vessels. • The S.L.V. was a result of Sea Transport Solutions focussing on possible answers to the operational problems of conventional landing Stern Landing Vessels S E A T R A N S P O R T S O L U T I O N S
Transcript
By: Stuart Ballantyne.
•Sea Transports Solutions Stern Landing Vessels (S.L.V.) have carved a niche into the small ship market, opening significant opportunities for builders and operators of passenger, utility, container, roro, bulk, AHTS and PSV vessels.
•The S.L.V. was a result of Sea Transport Solutions focussing on possible answers to the operational problems of conventional landing craft and to produce a vessel suitable for multi purposes.
Stern Landing Vessels
S E A T R A N S P O R TS O L U T I O N S
Conventional Landing CraftProblem Area No. 1:-
Poor Head Sea Capability• Having a bluff bow , waves in excess of
600mm (2 feet) start to cause slamming, jarring of the whole structure and spray enshrouding the cargo and the wheelhouse…….,
and the speed will drop dramatically
• The bow ramp in the stowed position creates a blind sector in the wheelhouse visibility. As most of these craft operate in coastal, inland and shallow areas, this of course is a problem in close quarter navigation. There are many recorded instances of groundings due to this fact, and running into windsurfers & small fishing boats at anchor has also occurred.
Conventional Landing CraftProblem Area No. 2:-
Poor Visibility
Conventional Landing CraftProblem Area No. 3:-
• The machinery space below the wheelhouse is just a source of noise and vibrations which makes life unpleasant for those onboard. For the crew, this can lead to lack of concentration and fatigue, particularly on extended voyages.
Wheelhouse on top of Machinery
Conventional Landing CraftProblem Area No. 4:-
• While trying to debeach, the traditional landing barge frequently encounters difficulty, particularly where the bow has grounded. This encompasses:-1. Propellers working inefficiently (ie. in reverse).2. Problematic loading of heavy equipment & large trucks.3. Bottom suction to sea bed in low draft, soft soil areas.
Beaching and Debeaching
Conventional Landing CraftProblem Area No. 5:-
• The stability of a box shape barge is quite limited due to:1. Low profile of the GZ curve.2. Small freeboard, & shallow deck edge immersion 4-5degrees.3. Free surface of numerous below deck flat bottom tanks.
• The stated total deadweight (dwt) of these vessels in most cases includes below deck liquid cargoes. “On deck” dwt is frequently as low as 45% of the total dwt.
Lack of Deadweight
Conventional Landing CraftProblem Area No. 6:-
• Constant pounding of the bow ramp may loosen securing fixtures and drop the ramp.
• Once the ramp submerges with the vessel underway the forces generated will fold the ramp under the vessel and tear it off.
Loss of Ramp
??? T H E S O L U T I O N ???
• In 1984, S T S established the criteria for an SLV.
1. Good head sea capability. 2. Ability to beach & debeach with ease. 3. Good visibility from the wheelhouse. 4. Accommodation clear of machinery space 5. Finer hull shape with a higher sustainable speed. 6. Cargo deck spray protection 7. Less free surface in tanks. 8. Access to bottom plating when beached 9. Elimination of the suction effect 10. Total protection of the stern gear
The S.L.V. incorporates a shallow “V” hull with two side pods, offcentre shafts & a beaching/protection/aft skeg arrangement.
• The Stern Landing Vessel is now a fine tuned design that has evolved to be a commercially & operationally unbeatable landing craft design suitable for multi purposes.
50m Stern Landing VesselL o a d i n g C o n f i g u r a t i o n s
Container / Roro(Stern View)
Bulk / Roro(Stern View)
“Sylvan” 20m Papua New Guinea Utility Boat• “Debarge” 20m Western Australia Utility Boat• “Debarge 2” 23m Western Australia Utility Boat• “Norwest Pearl” 23m Western Australia Pearling
Vessel• “Trader” 25m Queensland Pass/Car
Ferry• “Deepwater” 35m Queensland Bulk Carrier• “Lana” 35m New Zealand Pass/Car Ferry• “Lara V” 35m New Zealand Pass/Roro
