A PATENT ON NATURE

Novatug thinks it is simply unacceptable that lives are still lost during towing operations in 2015. And ‘more of the same’ simply will not work. More powerful engines? More brute force? That won’t help. Well, maybe just a bit. Marginally. But on the whole, ‘bigger’ is definitely not ‘better’. Novatug has the solution, and can feel justly proud of the fact. It has been a while, let’s be honest about that. And that in itself makes it clear that we are not talking about something new. It’s not an innovation; it has been two decades in the making. Novatug uses the mass of the adversary to win. Not by continually nudging it with an inert mass, but by taking control through fast and adept maneuvers.

The carrousel construction makes it possible to execute unique maneuvers. Maneuvers which are not part of the age-old tricks of the conventional tugboat trade. Different. Safer. The maneuvers that the carrousel allows, combined with the hull and Voith propulsion, mean that the captain benefits from a greatly enhanced freedom of movement. He literally has more room to maneuver safely. It’s not an innovation, it’s been there for ages. We have only ever tried to equal and oppose the forces of nature by using increasingly powerful engines. But adding ten per cent of extra engine power definitely does not automatically imply an increased result of ten per cent. Far from it.

PUT THRUST IN NATURE

With increased concerns about CO2 emissions, the demand for cleaner tugboats is greater than ever. Cleaner and more effective tugs are indispensable in a market in which cargo ships and cruise liners are getting bigger and bigger. This is a very appropriate example of ‘reversing the line of thought’. Finding a different approach. Not working against nature, but making use of it. Keeping nature ‘on a leash’ and letting it do the work for you. Co-operating with nature and ensuring that it’s on your side. Dynamic forces take over a large part of what was previously done with engine power, with many positive consequences. You reap the energy that is released from the maneuvers you can make using the carrousel construction. You harvest power.

We hardly need to explain that a reduction in the engine power required will yield many benefits: for consumption, for emissions, for the life of the engine, not forgetting the money that you will save. We raised the energy from beneath the waves above the surface and began to make use of it for practical purposes. We have not patented an invention. We have patented safety. We entered a whole new league. And not just by using the carrousel. With the design of the hull, the force of the Voith propellers and the winch construction as well. But let’s not forget the worldwide service model and our game-changing lease module. With this development, Novatug wants to thrust the tugboat industry forward by a gigantic leap. It’s not an innovation, it’s putting thrust in nature. A patent on nature.

CARROUSEL RAVE TUG

CRT

The Carrousel towing system is as simple as it is effective. It consists of a towing point on a straightforward steel ring, freely rotating around the superstructure of the tug. Novatug has taken the initiative to develop a game-changing harbour, terminal and escort tugboat, the Carrousel Rave Tug (CRT), around this innovative and patented Carrousel towing system. With the CRT Novatug entered a whole new era in towing. And this not just by using the Carrousel. By a clever combination of low-drag hull design,

versatile Voith propulsion, robust ABC engines and special Luyt winch a tug has been developed that will set new and unprecedented standards in safety, fuel efficiency and pulling power. All this is further enhanced by Novatug’s business model featuring worldwide service, fixed maintenance costs and lease options. With the development of the CRT, Novatug wants to thrust the tugboat industry forward by a gigantic leap. It’s not just an innovation, it’s putting thrust in nature.

ADVANTAGES

New market opportunities

New market opportunities

New market opportunities arise where now no tug service is considered. The Carrousel tug’s lower operational costs, speed of action and enhanced control over the tow can make the difference. For instance widening tidal or weather windows for certain ports or tug escort services with lower breakeven costs. And gaining time for vessels calling at a given port.

Elimination of capsize risk

Elimination of capsize risk

A tow load simply cannot capsize a Carrousel tug. Simple, but crucial for the evolution of the Carrousel Rave Tug. This was the main reason for the founding fathers of Novatug, the Muller family, to invest in the Carrousel technology: because it is safer for their people. It was never about changing the world. It was about taking care of their own people.

Better braking and steering

Better braking and steering

The tug’s own hull profile can safely be used for generating braking and/or steering forces, based on the lateral resistance of the hull through the water and given the kinetic energy present in the moving tow and/or the current. A Carrousel tug can brake or steer a moving tow much better than any regular tug relying on installed power for braking or steering.

Lower fuel consumption

Lower fuel consumption

For its braking and steering operations, a Carrousel tug needs far less (or in some cases no) added energy, resulting in significantly reduced fuel consumption and emissions. A Carrousel tug simply ‘harvests’ the kinetic energy from the moving tow and/or the water flow and uses that to brake or steer the tow. The cost saving potential on fuel alone is enormous.

Less repairs and maintenance

Less repairs and maintenance

The fact that a tugboat with Carrousel towing system depends on its lateral hull resistance more than its engines and propulsion systems in order to generate braking and steering forces, also means significantly less mechanical wear on the propulsion train with less yearly repair and maintenance costs and a longer economic life of the tug itself.

More slender tugboat design

More slender tugboat design

The basic hull design of a tugboat with Carrousel towing system can have a more slender and ship-shaped design, leading to less water resistance, resulting again in lower fuel consumption while sailing freely (ahead or astern) and higher hull speed, which is particularly important for escort operations.

FINANCIAL LEASING

Novatug will offer the Carrousel Rave Tugs on the basis of long-term (up to 20 years) bare-boat charters, basically a financial lease, which is both customary and proven in other capital-intensive industries like aviation. All operational costs with respect to the CRT, e.g. costs associated with fuel, repairs, maintenance and crew, are borne by the towage operators. Together with its industrial partners, Novatug will offer various maintenance schemes for the tug’s propulsion train,

Carrousel ring and winch so that Novatug’s clients are able to manage beforehand the ownership costs of the tugs down to a highly predictable daily rate reflecting the total operational lifecycle cost – only excluding fuel, other consumables and any possible repair costs. The industrial partners of Novatug are able to provide worldwide service.

Predictable costs

Predictable costs

In case of operational lease, there is the additional benefit of known fixed costs for maintenance.

Cheaper financing

Cheaper financing

Concentrating the financing of tugboats at a dedicated and specialized leasing company, enables economies of scale in sourcing equipment and raising finance.

Easier financing

Easier financing

Leasing finance is generally much easier and faster to obtain than regular bank loans, for which strict acceptance criteria and an extensive credit approval process apply.

Less capital tied up

Less capital tied up

Having relatively small periodic lease payments instead of a single, large investment outlay enables towage operators to invest in other projects that are essential to their business.

Cash flow matching

Cash flow matching

The cash outflows from periodic lease payments more closely match the towing revenues generated by the tugboat once in operation.

DREAM TEAM

These subsidies were for research aimed at cleantech solutions to help save fuel and emissions in general as well as in the maritime industry in particular. Academic institutions involved include TNO and the Delft University of Technology. Industry partners involved in the project, now and in the past, also confirmed the performance and potential of the Carrousel Rave Tug – the so-called Dream Team of Novatug:

Voith

Voith

Renowned German manufacturer of extremely robust and reliable marine propulsion systems and vessel controls that particularly suit the dynamics of the CRT. Voith also has deep knowledge of and experience with dynamic modes of towing.

Luyt Groep

Luyt Groep

Leading Dutch designer and manufacturer of marine winches. For the Carrousel Rave Tug Luyt has developed an alternative for a standard winch with the same operational capabilities, but being much lighter and requiring significantly less power to drive it.

Robert Allan

Robert Allan

The world’s leading consultancy firm on naval architecture and marine engineering for tugs. Robert Allan developed the Rave design with two Voith propellers in-line, which propulsion configuration is particularly suitable for integration with the towing system.

Anglo Belgian corporation

Anglo Belgian corporation

World-class manufacturer of robust diesel engines for marine use, with a wealth of experience driving tugs. Key elements are fuel efficiency, long lifetime, ease of maintenance and excellent competitiveness.

FAQ

When the towline angle increases relative to the longitudinal centerline of the tug, the towing point (winch) moves (with the towline) as well towards the tug’s side rather than staying fixed amidships on deck. During the initial heeling of the tug this towing point then moves down in height and thus decreases the arm of the heeling force, also decreasing the heeling moment (moment = force x arm) to zero and ending in a very stable position due to the fact that the towing point on board the tow is higher, creating a righting moment to neutralize the heeling moment. The Carrousel Rave Tug is optimized to make use of this simple principle.

The Carrousel Rave Tug enables you to use the hull profile to generate towline forces to brake and steer the tow. The function of the engines & propellers is then reduced to only controlling the heading and position of the tug, rather than (also) using them to generate towline force. The consumed power is logically substantially lower. Also the intrinsic safety of the Carrousel Towing System removes any need for a wide beam (and thus less efficient) hull shape. A more slender hull design is beneficial during free sailing. The Carrousel Rave Tug has an optimized hull shape for as little as possible resistance through the water.

VSP’s are the best option for dynamic conditions, like steering and braking operations in turbulent water and confined spaces (like locks), where water inflow and tug heading are frequently changing relative to each other. On top of this, VSP’s are also very accurate, controllable and fast in changing the tug’s heading, which is most crucial when using the tug for dynamic steering/braking. Finally, VSP’s are also extremely reliable with lower and predictable lifecycle costs. Any initial higher costs are balanced out during the tug’s lifetime by significantly lower repair, maintenance/overhaul costs. The Carrousel Rave Tugs will be made available on long term leasing propositions that are meant to reflect (and make immediately tangible) the lower total lifecycle costs.

The simple answer to this is ultimately no. In the end it is after all a steel construction that can rotate around a steel ring, which is welded in the ships deck as an integral part of the hull structure. Safely dealing with the forces that may be generated by the Carrousel System is however complex. This however forms an integral part of the Carrousel Rave Tug design and as such this has been the subject of years of real-life testing and the scrutiny of the world-class engineers of Novatug and its partners.

The investment costs for the Carrousel Towing System are in general in the order of magnitude of a current standard (double winch, fore and aft) towing configuration. The winch on the Carrousel System can act as bow as well as aft winch. The added dynamic operational possibilities and increased safety of the Carrousel System for crews are the priceless extras of the Carrousel Rave Tug.

The Carrousel System itself will work on any known tug design, so in principle the system is suitable for retrofitting as proven in practice by the prototype Multratug 12. Whether a conventional shaft propeller tug, an azimuth thruster tug or a Voith Schneider Propeller tug, the safety aspect that the tug can not be capsized by the towline force will be valid on whatever tug it will be installed as long as the chosen position for the ring is correct. In the Carrousel Rave Tug we have designed a tug that is optimized in all respects to make use of all the beneficial possibilities of the Carrousel System in terms of safety, operational possibilities and total cost of operation.

Tug and play

Bow tug steering and braking

Stern tug braking

Stern tug steering

Lemelerberg 7  2402 ZN  Alphen aan den Rijn  The Netherlands  info@novatug.nl  +31 (0) 172 533 705