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Find out the latest updates and more in depth information from our experts on Scillonian IV and Menawethan.

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The steel and aluminium structure of Scillonian IV is now over 95% complete, with all the main hull units fabricated. The cargo hatches, bow bulwark, funnels and radar mast, are all currently under construction in the fabrication workshops.

While the main hull continues to take shape in the building dock, three large mega blocks – MB03MB05, and the bow megablock are being constructed on the dockside. These blocks, made up of multiple units, have been moved to the dockside to undergo outfitting including piping, ventilation, cable trays, blasting and painting.

MB03 and MB05 will be integrated with the main hull after the installation of  the major components of machinery into the engine room. This is made possible via a ‘soft patch’ – a removable section of deck above the machinery space that allows equipment to be craned into place and welded shut after installation.

So far, the following equipment has been successfully installed:

  • Main engines and gearboxes
  • Intermediate tailshafts
  • Venitlation fans and trunking
  • All three generator sets
  • Both Selective Catalytic Reduction (SCR) exhaust treatment units
  • Sewage treatment and vacuum toilet systems
  • Refrigeration units for cold storage
  • Air conditioning system
  • Domestic hot water tanks (calorifiers) and air receivers

Mounting and alignment of these systems is ongoing.

At the bow, mega block integration is progressing steadily. This block is also being outfitted on the dockside and will be blasted and painted before final integration – scheduled to happen after Menawethan is launched in the autumn, freeing space in the dock.

Substantial progress continues with the manufacture and installation of pipework, cable trays, structural penetrations, and ventilation ducts.

Windows and portholes

All windows and portholes have been fitted in the crew accommodation areas, and installation of the wheelhouse glazing is progressing rapidly.

Main engines and gearboxes

Over the last couple of weeks, both the port and starboard main engines and gearboxes have been installed.

Blasting and painting

Blasting and painting is now well underway across multiple sections of the vessel. Several units have already been blasted and are ready for coating, while others have completed the full coating and painting process.



Step on board Scillonian IV with our Project Manager, Chris Lingham, as he takes you on a guided walkthrough of the vessel as the build progresses.

From the crew accommodation to the passenger lounge and wheelhouse, Chris talks us through the latest progress and gives us a real sense of how the new ship is coming together.

It’s an exciting glimpse of what’s to come as we step closer to the future of sea travel to the Isles of Scilly.


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Scillonian IV

Progress on Scillonian IV in April has been making great strides. Units 8.2, 10, and 18 have been successfully erected dockside, while the engine room has been rotated and lowered into the dock for integration. Fabrication work has commenced in the workshop on units 19 and 11. Additionally, outfitting activities are now underway in both the technical and the engine room.

Menawethan

Progress on Menawethan in April has included the installation of the port outer stern tube and sea grids. Preparation work continues in the Captain’s cabin for fitting bulkhead panels. The hull draft marks were accurately confirmed using a laser theodolite and have now been welded in place. Additionally, painting is currently underway in the steering gear compartment.


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Construction of Scillonian IV is progressing well, with all units (excluding the cargo hatches and bow bulwark) either constructed or under construction. Units 21, 22, 14 and 15 form a megablock (the mid parts of the passenger lounges, café, staircase and elevator shaft), for which outfitting is ongoing as well as preparation of the erection joints and seams. This megablock will not be welded to the rest of the hull structure yet, as it will be lifted off to enable installation of the main engines, gearboxes and generators in May.

Other aluminium units, units 24 and 25 – (the upper passenger and entrance foyer) are also fully constructed and erected with integration work ongoing.

The forward hull double bottom and the inner deck of the lower holds (units 8.1 and 8.2) have been fabricated, as has the aft lower and upper holds (units 9 and 17). Units 8.1, 9 and 17 are all erected with integration ongoing.

Units 10, 11, 18 and 19 are all being fabricated in workshops within the Piriou shipyard. The bow and bulbous bow block (unit 10) is a complex hull form with many intersecting curved steel shell plates and internal structures. The largest block unit 4 (which forms the engine room, switchboard room and steering gear room) is split into 2 sections forward and aft. The forward section (4.2) is erected with integration ongoing, the aft section (4.1) is still being fabricated in one of the yard’s workshops. The after section is similarly a complex and interesting hull form with the incline of the bottom and the curvature of the propeller tunnels.

Outfitting work is progressing well, with the installation of stairs, guardrails, mooring equipment, machinery foundations, floorplate supports, electrical preparations, ventilation ducting and piping.

Blasting and painting of tanks and void spaces is also now underway.


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Menawethan now resembles a complete ship, with all hull blocks fully integrated in the building dock. On 12th March 2025 the final hull block, unit 14, was erected with the hull in the dock. This is the upper part of the cargo lift trunking and will contain the hydraulic ram for the cargo lift and also the structure to support the side shell door.

The impressive unit 11, which includes the wheelhouse, passenger lounge and crew accommodation, and units 12 (the engine casing) and 13 (the forward bulwark) have all been integrated with the rest of the hull in the building dock.

With the steel construction of Menawethan’s hull and super structure largely complete, work is now ongoing with outfitting, including the installation of stairs, guardrails, mooring equipment, machinery foundations, floorplate supports, electrical preparations, cargo securing arrangements and system piping. Work is also ongoing with the installation of the tunnel thrusters and stern tubes.

Blasting and painting of tanks and void spaces is also now underway, and the propellers, shafts and inner stern tubes have arrived. Preparations for mounting the outer stern tubes is underway.

Machinery is increasingly arriving at the shipyard, including Menawethan’s main engines, generators and propeller shaft line.


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We are proud to be working with two leading Cornish companies, Armada Engineering Ltd and Wills Ridley Ltd, to supply hydraulic and steering systems for our new vessels, Scillonian IV and Menawethan.

Armada Engineering Ltd and Wills Ridley Ltd both have long histories of working with the Steamship Group, providing maintenance support on the company’s current vessels for more than 30 years.

Falmouth-based Armada is a world leader in marine hydraulics and engineering, with an office and workshop in Barcelona to service the superyacht industry.

The company has an unrivalled reputation creating state-of-the-art hydraulic systems and engineering solutions for marine vessels of all kinds, and works in markets including renewable energy, oil and gas, mining and construction.

The hydraulic power units for Scillonian IV and Menawethan will be designed, built and tested at Armada’s workshop in Falmouth before being shipped to Vietnam for installation.

On Scillonian IV, these will power the windlass and gangway davits, and on Menawethan, the unit will power the deck hatches, cargo crane, pallet lift, side door, bow thrusters, windlass and the fore and aft capstans.

Wills Ridley has designed and manufactured hydraulic steering gear, electrical controls and rudders since 1963. With agents in 32 countries, it supplies the commercial, military, and superyacht marine sectors.

The components for the steering gears will be manufactured at Wills Ridley’s factory in Penryn before being installed and tested in Vietnam.

The electrical controls for Scillonian IV and Menawethan utilise state-of-the-art technology. There are multiple steering positions where the rudders can be controlled independently, and there is an option for the rudders to be synchronised electrically. The steering system must interface with other electrical systems, such as the autopilot.

As part of the safety system on board the two vessels, the steering gear is designed and manufactured in accordance with Lloyds Register of Shipping rules.

Stuart Reid, Chief Executive of the Isles of Scilly Steamship Group, said: “I am delighted that our trusted and valued relationships with Armada and Wills Ridley will continue, with the companies not only supplying the new hydraulic and steering systems, but providing ongoing technical support for the new vessels.”

Joff Collins, Managing Director of Armada, said: “We are genuinely honoured to be continuing our long association with the Isles of Scilly Steamship Group. We’ve been providing maintenance support to the Group’s fleet of vessels for 30 plus years, so we understand what a lifeline they are to the local community.

“I’d like to thank the Steamship Group for a successful partnership spanning three decades, and to our technical director Alan Rowe for bringing this project to fruition with the help of our in-house design team Mike Tonkin, Murray Walker and Ben Rowe.”

Ryan Kitchener, Director of Wills Ridley, said: “These vessels have been discussed for many years, and it is great to see the project come to fruition. As a proud Cornishman, it is very rare to work on new-build vessels of this size that will operate on our doorstep. Everyone at Wills Ridley is excited to be part of this project.

“I look forward to attending the sea trials and using Scillonian IV in future as a passenger with friends and family once the vessels are in service.”

Scillonian IV and Menawethan are being built by Piriou, and are on schedule to be delivered in 2026 to meet the travel and freight requirements of the Isles of Scilly for generations to come.

The new vessels will feature a range of new technologies, helping to improve resilience, comfort and reliability. Scillonian IV will carry up to 600 people (a 24% increase on current levels) whilst reducing journey times. It will feature roll and pitch reduction systems, to enhance passenger comfort, and is designed utilising modern propulsion technologies that improve efficiency and reduce environmental impact. The vessel is also designed to integrate further enhancements as technology develops.

Menawethan will also include a range of improvements on the current vessel, including a much-enhanced cargo capacity and an improved capacity for perishable, chilled and frozen goods, meaning that supplies can be transferred between the mainland and the islands more reliably all year round. The freight vessel will incorporate a passenger lounge with accommodation for 12 passengers.


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Scillonian IV has seen units 14 and 15, parts of the main deck (lower passenger lounge), integrated in the building dock, with units 1, 2, and 3, the double bottom, main engine room and auxiliary engine room, followed by units 6, 7 and 8, the double bottom, technical room and lower crew accommodation.

UNIT 22 INTEGRATION The main mid-section of the hull comprising a block of eight units, is now in situ in the dock. Units 21 and 22 (part of the upper passenger lounge, staircase and elevator shaft) have been integrated on top of units 14 and 15.

On the quayside, units 8.1, 8.2 and 9, hull blocks of the bow section are being fabricated and the largest block of all, unit 4 (the main engine room, switchboard room and steering gear room) is being fabricated in a workshop within the shipyard.

The wheelhouse and upper passenger lounge blocks unit 26, unit 25 and unit 24 are being fabricated in a specialist dedicated aluminium workshop within the shipyard.


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Menawethan now resembles a ship, with all hull blocks now in the building dock.

On 21st January, the “mega block” comprising units 1, 2, 6 and 7 (the main engine room, keel block and aft part of the upper cargo hold) was lifted from the dockside and successfully integrated with the fore part of the hull.

With the complete hull now in place, only four blocks remain to be added – unit 11, which includes the wheelhouse, passenger lounge and crew accommodation, and is currently under construction in the fabrication shop; unit 12, the engine casing, which is ready and waiting on the dockside; unit 13, the forward bulwark, which is under construction; and unit 14, the cargo elevator upper casing, which is complete and ready for integration.

As well as the hull structure fabrication a huge amount of system piping (ballast, bilge, fuel oil, scuppers, lub oil and fresh water) have been fabricated and installed within the hull blocks.



Peter Broad, our Site Manager, provides an update on the build, showing the unit blocks that have been constructed and explaining how each part will come together to form the final vessels.

It’s incredible to see the vessels taking shape, and we’re excited about the progress as we move closer to completion.

A big thank you to the team at Piriou Shipyard for their dedication and hard work in bringing these new vessels to life.


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We have seen substantial progress in our new cargo vessel’s construction since our last newsletter, with significant developments across major hull block fabrication.

Hull Block U1: Engine Room and Steering Gear

This intricate block is currently being fabricated in the building dock. It is designed to accommodate critical systems like engine beds, steering gear, propeller shafts, rudders, and double bottom tanks.

Hull Block U10: Bow Block

The bow block is progressing well and is being fabricated in two sections, upper and lower, in the workshop. This bow block will incorporate the bulbous bow, bow thruster tunnels, and anchor chain lockers.

Hull Block U8: Upper Hold

Designed with an opening for the cargo hatch and side access for the cargo hoist, this block will soon be positioned on top of the fully integrated blocks U4, U5, and U6 in the building dock. This addition will help shape the vessel’s cargo hold structure.

Lower Hold and Double Bottom Blocks (U4, U5 & U6)

The integration of blocks U4, U5, and U6 has been successfully completed within the building dock, forming a solid base for the cargo hold. Painting of the underwater areas has started with localized shot blasting and painting of the flat bottom and keel plate, using International Paints’ anticorrosive coatings to protect against corrosion and two coats of antifouling paint to prevent marine growth.