Page 134: of Maritime Reporter Magazine (June 1998)

SPAIN

Bilbao area, the Zamakona yard has generated and maintained a substantial tug construction workload, currently including a seven-vessel series for Spanish towage contractor Grupo

Boluda. The Boluda program consists of three tractor tugs, one of which has been delivered, plus four stern drive tugs, with identical main engines and Aquamaster azimuthing propul- sion units.

The Spanish yard has also this year given new depth to its international market standing by building a Schottel tractor tug of 45-tons bol- lard-pull for a German operator.

Zamakona's production versatility, and the export competitiveness of Spain's private sector, were again demonstrated at the beginning of the year by the commissioning of a double- ended fjord ferry for operation in the west

Norwegian county from which owner More og

Romsdal Fylkesbaatar (MRF) takes its name.

Arranged to carry 400-passengers and 75- cars, or a mix of 59-ft. (18-m) trailers and cars, the 285.4-ft. (87-m) Ivar Aasen rates as a rare example of foreign construction among a fleet designed to maintain short crossings on the

Norwegian fjord service network, an essential part of the transportation infrastructure. The remarkable propulsion system comprises two

Schottel azimuthing units, one at each end of the hull, and in each case incorporating contra- rotating, twin-propellers.

The intact skills at Santurce in building com- petitive, rugged vessels for the fisheries sector were given higher

The intact skills at P™fileby the deliv-

Santurce in build- ing competitive, rugged vessels for the fisheries sector were given higher state-of-the-art ery to Shetland own- ers last year of the 144.3 ft. (44-m) state-of-the-art

Sunbeam.

It has been con- ceived for stern trawling and twin , ,, j |« rigging on the estab-profile by the deliv- ,. f , , r J lished grounds ery to Shetland around the U.K. and , , „ north of Norway, owners last year of , ,

J together with the the 144.3 ft. (44-m) developing deepwa- ter fishing in the

Atlantic. Its design

Sunbeam reflects the special considerations aris- ing from operations in hostile environments, with an emphasis on the ease of handling the extensive gear carried by such a multi-function vessel.

Zamakona is one of the nine, independent shipbuilding companies which owns the

Madrid-headquartered commercial organiza- tion Construnaves.

With more than 30 years' experience in the international market, its role can potentially embrace all financial aspects of newbuilding agreements. The resilient private sector as largely represented by the nine firms is

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Circle 312 on Reader Service Card involved in a diverse range of small and medi- um-sized vessels, up to the 554.4-ft. (169-m) maximum length offered by Union Naval de

Levante (UNL) and the 541.3-ft. (165-m) at

Naval Gijon.

In totality, the shareholders in Construnaves offer one of the most comprehensive newbuild- ing possibilities worldwide for fishing vessels, the generic type that provides the ties that bind within the industry.

Strategically located at the entrance to the

Mediterranean on the Strait of Gibraltar, and in an area of increasing transhipment activity, a new repair yard is about to start operations under the Cernaval banner.

Founded on a 70,000-sq.-m. site at Algeciras

Bay previously used by the former Crinavis shipyard, the new enterprise will be able to dry- dock vessels within the limits of a 9,000-ton lift- capacity floating dock of 525 x 78.7-ft. (160 x 24- m) main dimensions, and carry out repairs afloat to ships of any size.

The yard's huge integral dry dock of 1,312.3 x 164-ft. (400 x 50-m) will initially be used as an open, unlocked facility, providing alongside berthing for vessels under repair, refit or con- version.

Created 11 years ago by a broad spread of shareholders, comprising both companies and individuals involved in the marine business, technical consultancy firm Sistemar has achieved sustained success with its innovative,

CLT (contracted and loaded tip) propeller con- cept.

In fact, a record volume of business was gen- erated for the design over the course of the past year in the newbuild and retrofit markets.

Depending on the type of ship and nature of the propulsion plant, fuel savings of 10 to 15 percent have been claimed for propellers employing CLT blades, together with enhanced maneuverability and low vibration levels.

While the actual gains and perceived advan- tages vary in accordance with the precise nature of the ship design, engineering installa- tion and field of operations, the increased rate of recourse to the concept in 1997 testifies to demonstrable, overall performance benefits.

Central to the higher efficiency engendered by the CLT propeller is the design of blade geome- try relative to radial circulation distribution, coupled with the adoption of the distinguishing end plates at the blade tips. Also described as barrier elements, the plates contribute to the creation of a high pressure differential between the forward and after areas of the screw.

The entire series of B577-designated bulk/container carriers under construction in

Poland at Stocznia Szczecinska for Compania

Chilena de Navegacion Interoceanica (CCNI) is being equipped with CLT monoblock propellers manufactured in Spain by Navalips. Several newbuildings booked with the Szczecin yard by local shipowning group Polish Steamship

Company (PZM) will also feature the concept, and it was anticipated the overall propeller pro- duction would be assigned to the Polish compa- ny ABB Zamech. 136 Maritime Reporter/Engineering News