Feature 7 | ADVANCED HULLFORMS
SWATH patrol boats for Latvian Navy
Abeking & Rasmussen (A&R) has secured an order for
fi ve 25m ‘SWATH@A&R’ patrol boats for the Latvian Navy.
The craft will be designed by A&R and constructed and
delivered in co-operation with Riga Shipyard.
The new vessels will derive from the proven SWATH
(Small Waterplane Area Twin Hull) pilot boats in operation
since 1999 in the German Bight and recently in Dutch
Waters. They will have the same main dimensions and
underwater ship with a complete new propulsion and
accommodation concept.
A&R said the decision by the Latvian Navy to opt for
the SWATH concept was made in order to benefi t from
seaworthiness of the SWATH hullform. Up to eight crew can
remain at sea for one week, even under adverse weather
conditions to fulfi l the main tasks for the new vessels: Blohm + Voss has laid the keel for a new customs vessel with a
patrol and surveillance of territorial waters and EEZ, and SWATH hullform for the Kustenwache.
participation in international assignments. Since the fendering
of the pilot boats will be retained, the 25m SWATH@A&R
patrol boats will be well-suited for boarding operations.
The new vessels will feature a modular mission bay
at the fore ship, and by fi tting appropriate mission
payloads - such as a diving module or a MCM module -
the capabilities of the vessels can be fl exibly enhanced.
Delivery of the fi rst-of-class is scheduled for December
2010 from A&R’s yard in Lemwerder, Germany.
On 8 August, the fi rst of a new class of SWATH hullform
customs vessels for the German Customs (Kustenwache)
was laid at Blohm + Voss shipyard in Germany (part of
ThyssenKrupp Marine Systems). The two craft are due to be
delivered to the Kustenwache in May and November 2009.
For TKMS, the order represents a continuation of the
SWATH programme undertaken for the German Navy
research vessel Planet, which was delivered in 2004. The new customs craft will have a displacement of approximately
The new customs craft will have a displacement of 1000tonnes and will have diesel electric propulsion machinery.
approximately 1000tonnes and will have diesel electric
propulsion machinery. Built in accordance with the rules
and regulations of classifi cation society GL, they will be 49m in overall length, with a moulded breadth of 19m and
moulded depth of 9m.
The accuracy of thin-ship theory mass and damping were determined in one velocity-potential-based codes enabled
resistance predictions was satisfactory when of two ways, either solving the boundary- the authors to explore design trade-off s,
compared to the experiments; the average value problem with all sub-hull sections and even examine geometrical variants
normalised diff erence was approximately present at each station, or with a proper that fell outside the originally defined
10%. Th e most distinguishing attribute of summation of the contributions to the parameters. WT
this code in the present endeavour is the forces of each individual sub-hull.
computational efficiency of generating The comparison to experiment is *SNAME 2008 annual conference,
predictions. The efficiency of this code encouraging, especially with the predictions Conceptual Design and Hydrodynamic
enabled the user to investigate new designs utilising the separate sub-hull analysis. Th e Analysis of a High-Speed Sealift Adjustable-
of greater overall length in an effort to designer must accurately predict loads Length Trimaran, K J Maki (AM), L J
reduce fuel consumption. on the centre hull in order to design the Doctors (M), R M Scher (M),W M Wilson
Strip theory was used to predict the structure and articulation mechanism, and (V), S H Rhee (AM), A W Troesch (FL), R
motion RAOs for the trimaran. Th e added further analysis is necessary. Th e effi cient F Beck (FL)
70 Warship Technology October 2008
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