Design – ISSG New Vessels

In this issue, we’re pleased to share a conceptual look into Scillonian IV, created by design specialists. These concepts help visualise the overall look and feel of the vessel’s interior as we reach a key stage in development, moving from initial ideas towards final designs, materials, and finishes. They illustrate the vision for passenger lounges, café areas, and other key spaces on board.

During his visit to the furniture manufacturing factory in Ho Chi Minh, Stuart Reid reviewed interior materials being prepared for fit-out and provided feedback on elements that were well received by the shipyard. The factory, renowned for superyacht outfitting, showcased the high-quality construction and materials being deployed for the vessel.

The discussions and feedback from this visit will guide the next stage of development, helping ensure the interiors achieve the right balance of comfort, style, and functionality for passengers.

Since March, Chris and Peter, working closely with Piriou, have processed more than 300 plans and documents for approval for the hull structure, machinery, electrical and control systems and piping systems, as well as detailed design for passenger areas.

Many of these structural and systems plans have also been reviewed by a team of plan approval engineers from Lloyd’s Register, who ensure that the builds meet the specific class rules and statutory standards.

Plans relating to the safe operations (statutory) of the vessels have also been reviewed by the Maritime and Coastguard Agency for compliance with the UK’s flag requirements.

Detailed design is ongoing concurrently with the construction, and we have recently received detailed design drawings for electrical and control systems for both vessels.

We are pleased to inform our readers of significant developments with Scillonian IV.

The naval architects, Van Oossanen have been working to optimise the hull form which, combined with its patented Hull Vane®, will provide a total efficiency gain of 17% at 16 knots, with corresponding reduction in fuel consumption and exhaust emissions.

The Hull Vane® is a wing, mounted at the stern of the vessel that converts water flow over the wing into forward thrust.

These optimisations have the added benefit of further damping the pitch and rolling motion of the vessel, providing increased passenger comfort.

We have been working closely with Piriou developing and finalising the vessel designs ready for building to commence in June. The Scillonian IV design progression has seen the introduction of a Hull Vane®.

The Hull Vane® consists of a submerged fixed wing at the stern of the vessel. A wing placed in a flow generates two forces: a lift force and a (much smaller) drag force. The flow under the aft ship is not horizontal but angled upwards. When designed well, the force generated from the Hull Vane®, which is the sum of the lift and drag force, is angled forward.

This means that it has a vertical component (lifting the aft ship), as well as a net forward horizontal component (pushing the ship forwards). Model tests in waves have shown that the Hull Vane® significantly reduces ship motions such as pitching, heaving, rolling and yawing, and thereby reduces the added resistance from these motions by 10 to 30%.

Furthermore, when the ship is pitching, the Hull Vane® produces more forward thrust, an effect which is called the “pumping effect”, as it is similar to what surfers do on surfboards equipped with hydrofoils.

15 knots with Hull Vane®

15 knots without Hull Vane®

Articles

Scillonian IV interior concepts

Plan approval

Scillonian IV Hull optimisation

Design elements – Hull Vane®