Page 62: of Maritime Reporter Magazine (June 1999)

10 Significant Marine Innovations

GALLEY EXHAUST carry 42 cars or a combination of cars and trucks.

Propulsion

The quadruple screw arrangement gives a total redundancy package where a master is usually happy to take a ferry into operation with three out of four engines available. This, of course, can- not happen when the vessel loses one out of two engines. The four small engines also make the machinery replacement easy, and a fifth engine for rotational maintenance makes sense.

As pointed out by STS, while the cost of four small engines is actu- ally cheaper than two larger units of the same aggregate power, the extra cost of the stern gear, engine mounts, exhausts, etc., actually brings the cost of a quadruple

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The rapid acceleration and decelera- tion in a four propeller configuration also gives added incentive to operators who are chasing tight schedules. For night freight runs and low season opera- tion, two engines can be shut down. CP props are designed for the larger ver- sions with alternator close coupled to the main engines for powering bowthrusters.

Access to the machinery spaces on the

STS designs is by spiral staircases on each quarter of the vessel, utilizing the dead space that vehicles cannot maneu- ver into. This configuration results in an easy access to a spacious engine room which also houses the steering gear and auxiliaries. A one stop shop for the duty engineer. The centerline girder also incorporates an escape access from one engine room to the other, well above the cross flooding level. Fuel tanks are incorporated in the centerline structure in saddle tank arrangements and incor- porated into the higher axle loading areas. Forward fuel tanks in the lower part of the hulls also give the designs some trim capability.

The STS range of catamaran designs incorporates full compliance to the latest

RoPax stability rules, including compli- ance to the Stockholm rules.

Remote Island Service

South Australia has had two of STS' 120 ft. (37 m) designs operating across the very rough patch of water between the mainland and Kangaroo Island since 1984, with an impressive weather down- time of less than one percent. These vessels, the Philanderer 3 and Island

Navigator, had a very positive impact on the local economy since starting in 1984, creating a reliable daily link and establishing a healthy commuter and tourist trade. During this time, several high speed ferries have started in com- petition and all reportedly have failed.

The STS philosophy of designing around regional and outlying economic parameters has resulted in a very inter- esting range of designs, which now have been sold to 21 countries. Many orga- nizations are now realizing that fast fer- ries — with higher R&M costs — may not have necessarily been the right solu- tion for a given route. The STS range offers an interesting alternative.

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HORNBLOWER 64 "The Yearbook" Maritime Reporter/Engineering News