Case Study
Autrement Passenger | Baudouin Case Study
Autrement Powered by Baudouin Marine Propulsion Engines
CASE STUDY
- Cylinders: 6 | 4
- Bore & Stroke (mm): 150x150 | 105x130
- Total Displacement (L): 15.9 | 4.5
- Certifications: IMO III
Solution
- 2x 6M26.3 SCR Marine Engine | 1x 4W105S Marine Genset
- P3 Intermittent Duty
- Special Passenger boat
- Nova Shipyard (Turkiye) and BTMavrasya and Armor Navigation
Reliable Power for Passenger Excursions in Brittany
Armor Navigation, a French ferry operator based in Brittany, launched an ambitious project to upgrade its fleet with a modern, more environmentally responsible passenger vessel.
The result is Autrement, a 24.98-metre aluminium ferry built by Nova Shipyard in Türkiye to a design by Mer et Design in France.
Designed to carry up to 200 passengers, Autrement was conceived to offer a premium, yacht-inspired experience for excursions around the scenic Seven Islands, while meeting strict performance and environmental targets.
A key requirement was a propulsion solution capable of reaching a service speed of 17 knots fully loaded, and up to 19 knots in light condition, while complying with IMO Tier III emissions standards.
To meet these requirements, Armor Navigation and Nova Shipyard partnered with BTM Avrasya, Baudouin’s regional distributor, to integrate an advanced Baudouin diesel powerplant into the vessel.
Autrement is powered by two Baudouin 6M26.3 SCR marine propulsion engines.
Each engine delivers 552 kW, or 750 HP, at 2100 rpm, providing the power required to meet the vessel’s service speed target of 17 knots.
The engines are coupled with ZF gearboxes and efficient propellers, supporting smooth acceleration, reliable propulsion and strong operational performance.
The Baudouin 6M26.3 SCR engines are 6-cylinder, 15.9-litre marine engines designed for demanding passenger vessel applications.
Their P3 Intermittent Duty rating makes them well suited to the vessel’s operational profile, delivering high power during peak excursion periods while maintaining fuel efficiency and low emissions.
The engines also support quiet operation and reduced vibration, helping improve the onboard passenger experience.
With integrated Selective Catalytic Reduction systems, the Baudouin 6M26.3 SCR engines meet IMO Tier III emissions standards.
This allows Autrement to operate more cleanly in Brittany’s protected coastal waters, reducing NOx and particulate emissions.
For a passenger vessel operating in a sensitive tourism environment, this emissions performance directly supports Armor Navigation’s sustainability objectives.
In addition to the main propulsion engines, onboard electrical power is supplied by a Baudouin 4W105S marine genset.
The genset delivers up to 100 kVA, or 80 kWe, at 1500 rpm, supporting the vessel’s electrical systems.
Compact and marine-grade, the 4W105S shares the same focus on reliability, low maintenance and operational efficiency as the main propulsion engines.
The propulsion setup is also designed with future conversion in mind.
Both the ship design and the engines support hybrid conversion with minimal structural changes, allowing batteries and electric motors to be integrated if required.
This makes Autrement a future-ready passenger vessel, capable of adapting to evolving operational and environmental requirements.
Since entering service with Armor Navigation, Autrement has consistently met its speed and performance goals. The crew reports excellent handling, quiet cruising and smooth acceleration, even under load.
The robust design and extended service intervals of the Baudouin engines provide reliable performance and cost control throughout the operating season.
By combining clean engine technology, naval architecture and marine engineering within a well-managed project framework, Autrement stands as a strong example of sustainable passenger transport.
The project also represents an important milestone for BTM Avrasya within the BTM Group ecosystem.
Partner Testimonial
“We are proud to have delivered a complete propulsion package through our system integration and project coordination capabilities.
This project demonstrates what is possible when clean engine technology, naval architecture, and marine engineering come together within a single, well-managed operational framework.
It stands as a strong example of sustainable passenger transport and represents an important milestone for BTM Avrasya within the BTM Group ecosystem.”
Serge van der Haegen, Founder of BTM Group
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