SIGMA NAVAL PATROL SERIES

 
 
 
SIGMA DESIGN APPROACH
Royal Schelde presents its new range of Naval Patrol vessels based on its unique and highly innovative Ship Integrated Geometrical Modularity Approach, in short 'SIGMA'.
The driving factor behind the SIGMA-approach is to respond to the world market's demands of today and the next decades, emphasising notably the following two aspects:
  • Flexibility in establishing the optimum arrangement of the customers' current operational requirements, whilst maintaining the possibility to implement the changing needs of tomorrow, which may require modifications or upgrades, thereby avoiding premature obsolescence of the vessel;
  • Affordability, by a balanced trade-off between required capabilities on the one hand and initial procurement and subsequent life cycle cost on the other hand.

To achieve this goal the SIGMA-approach is in essence customer-oriented:

  • It provides a wide selection of basic versions with a vast range of options to enhance and customize the vessel without deviating from the proven product composition;
  • It allows a competitive price and speedy delivery.
     
  GEOMETRIC MODULARITY
Modularisation in naval shipbuilding is usually limited to using standardised pallets and containers. However, the associated advantages of this building method (risk reduction, shorter building time) can better be achieved otherwise. Royal Schelde chose to go a radically different way, by defining a set of geometric parameters, which are now applied throughout the entire SIGMA-range, thus providing a repetition of identical units, both in the dimensioning of the ship's spaces and in the lay-out of systems.

PROVEN DESIGNS
To validate the geometric modularity applied to the hull in the SIGMA-approach, a large number of tank tests has been conducted in a joint research program, conducted by the Marin institute and Royal Schelde's engineering department. The prime aim of the research was to establish to what extent it is possible to apply geometric modularity to hull shapes by applying parallel mid ship sections - and this without compromising the hull's hydrodynamic highspeed displacement characteristics. The tank tests resulted in the dimensioning as specified in the tables below, with a basic series covering patrol vessels in the range of 52 m to 98 m length over all, with displacements ranging from 440 tonnes to 1930 tonnes. In the Schelde Naval Patrol-series, each specific configuration is indicated using a four-digit number, designating its approximate length and breadth overall in meters.

The Schelde Naval Patrol-series marks a breakthrough in ship design and sets the trend in naval shipbuilding today and tomorrow.

COMBAT SYSTEMS OPTIONS
In the SIGMA design approach the mission of the ship such as "Customs / Police", "Coast Guard / Offshore Patrol", "Littoral Warfare" or " Blue Water" mission profiles, determines the Combat System configuration, the ship's speed, the maximum range, the crew size and the mission time. These elements in turn determine the ship's hull and topside. Royal Schelde cooperates with all reputable combat system and weapon suppliers and can configure and deliver on a turn-key basis the optimum combat system, that matches the ship's mission profile.
 
BALANCING MILITARY AND COMMERCIAL STANDARDS
Standardisation apart, the quality and competitiveness of the Naval Patrol series are further enhanced by Royal Schelde's vast experience in applying a clever mix of commercial and military standards and specifications, which it has built up in Royal Netherlands Navy innovative programs since the late eighties.
The four Royal Netherlands Navy Air Defence Command Frigates are designed and built by Royal Schelde using navalised commercial equipment and techniques made suitable for naval application. Yet these Frigates meet the most demanding operational and technical requirements. This approach is now projected onto the Schelde Naval Patrol vessels and allows the customer to make a balanced selection of commercial and/or military standards and specifications, that matches his operational requirements.
 



 
PROPULSION OPTIONS
Propulsion options include twin screw controllable pitch propeller or twin water jets, driven by two or four diesel engines and twin screw fixed pitch propellers or twin water jets, full electric driven by four to six DG-sets. Other options, e.g. including gas turbines, are available.
 
HULL FEATURES
  • Proven and tested hull form series
  • Straightforward layout and throughout internal accessibility
  • Ergonomic bridge layout with optimal panoramic visibility
  • Hangar optional
  • Low-Spray-Bow optional

ROLL REDUCTION SYSTEM OPTIONS:
  • Bilge keels (limited roll reduction)
  • Fin stabilization (speed dependent)
  • Roll stabilization tank (also at low speed)

 

  VULNERABILITY REDUCTION OPTIONS:
  • Signatures:
  • Noise attenuation, flexible mountings
  • RCS shaping
  • IR shielding
  • Magnetic degaussing
  • Watertight integrity:
  • No access doors between compartments below bulkhead deck
  • Progressive flooding prevention
  • Shock: functionally optimized
  • NBC protection: citadel, NBC-filter
  • Redundancy in essential services by layout and duplication
INTACT & DAMAGED STABILITY:
  • IMO
  • Naval 80 knots wind
  • Naval 100 knots wind
  • Naval, two-compartment damage

 

 
 
SCHELDE NAVAL SHIPBUILDING

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P.O. Box 16 - 4380 AA Vlissingen - The Netherlands - Phone +31 118 483911 - Fax +31 118 485010 - Website www.schelde.com