Design rationale

In 2012 Royal Niestern Sander in Delfzijl delivered the ‘Sanaborg’ and the ‘Serkeborg’ to Wagenborg Offshore. These Ice Breaking Multipurpose Support Vessels (IMSV) have been jointly developed, by the shipyard, Wagenborg and Conoship, for offshore services in shallow water and under arctic conditions. The ‘Sanaborg’ and ‘Serkeborg’ are more efficient than the existing vessels because of the new hull form, which was developed by Conoship International. Design target was to reach a minimum speed of 4.0 knots in unbroken first year ice of 0.60 m thickness. Model tests were conducted to verify the icebreaking performance in deep and shallow waters, as well as “washing and breaking the ice” to penetrate grounded ridges travelling stern first. Equipped with two Wärtsilä Icepod thrusters the vessels reach a bollard pull of 36.3 mT and have excellent ice management capabilities.

The vessel has been converted to a luxury explorer yacht named Ragnar by Icon Yachts and delivered in 2020.

> Read more about Ragnar

Length over all68.20 m
Length between p.p.63.45 m
Breadth moulded14.00 m
Depth5.10 m
Draught (design)2.50 m
Deadweight (design)444 ton
Draught (summer freeboard)3.15 m
Deadweight (summer)1005 ton
Gross tonnage1520
Speed (service)12.5 kn
Main engine2 x 1950 kW
Auxillary engines1 x 250 ekW
Bow thruster1 x 200 kW
Crew8 pers.
Passengers5 pers.
Number of cabins8 pers.
© Conoship International