Share this page:
  • VESSEL TYPE: Offshore Wind Vessel
  • VESSEL Name: Voltaire
Scope of work


  • General Arrangement drawings
  • Lightweight Calculation drawings
  • Tender Design Drawings

FEM Analysis

  • Main hull
  • Legs and spud cans
  • Leg wells
  • Jacking frames
  • Main crane pedestal
Project specification

Download specification

The vessel is designed by Jan De Nul,

“Voltaire” is a self-elevating and self-propelled vessel designed for installation of offshore wind turbines. The vessel is under construction at COSCO Shipping Heavy Industries in China and is expected to be delivered to the Jan De Nul Group in 2022.

With four approximately 130 m long truss-type legs and a high-speed rack-and-pinion jacking system, the vessel is able to operate on up to 80 m water depth, and with 7000 m2 cargo deck, a 3,000 t main crane and a jacking deadweight of 14,000 t, it is able to carry and install even the largest wind turbines.

The vessel is equipped with a DP-2 diesel-electric propulsion system consisting of 8 gen sets, 4 stern thrusters, 2 bow thrusters and 2 retractable bow thrusters.

The accommodation block, which holds 100 crew single cabins, is unique in that it is divided into two separate blocks – one in each side – which allows long cargo items to be stowed in the CL between the two blocks. The vessel is further equipped with a helicopter deck.


Length overall, excl./incl. helideck 169.30/181.78 m
Breadth, moulded 60.00 m
Draught, max 7.50 m
Depth to main deck 14.60 m
Deadweight, max. 21,500 t
Deadweight, for jacking 14,000 t
Main crane – main hoist max lifting capacity 3,000 t
Aux. hoist 250 t @ 135 m
Cargo deck 7,000 m2, , max. UDL 20 t/m2
Service speed, max. 11.5 kn


Jan De Nul Group orders third wind turbine installation vessel
Read more
Wind Turbine Installation vessel
  • Vessel type: offshore vessel
  • Vessel name: Pacific Orca & Pacific Osprey
  • Project number: 07086, 10073
Read more
Mayflower Resolution a special Wind Turbine Installation Vessel designed by KNUD E. HANSEN
Wind Turbine Installation Vessel
  • Vessel name: Mayflower Resolution
Read more
MPI Resolution
  • Vessel name: MPI Resolution
Read more
Installation vessel designed for future windmills
Read more
KNUD E. HANSEN designs record breaking wind turbine installation vessels ”Pacific Orca” and ”Pacific Osprey”
Read more


    * Required fields
    Sign up for our newsletter