The Max Planck Society arrived at YYachts with a brief that fell outside every conventional category. The organisation needed a vessel under 25 metres that could cross entire ocean basins unassisted, operate with minimal noise and turbulence near sampling sites, carry professional-grade scientific equipment, and house a small team of researchers for weeks at a stretch. Neither a standard workboat in steel nor one in aluminium came close to meeting those demands. What emerged from that brief was Eugen Seibold, launched and christened in 2018, a purpose-built floating field station that looks, from a distance, like a performance cruising yacht.
Hull form and materials were among the first decisions to shape everything else. YYachts drew on its background in composite yacht construction but moved away from the light laminate schedules that suit racing or passage making. The engineering team developed a stronger, somewhat heavier hull capable of handling deep ocean conditions and the sustained mechanical loads imposed by scientific winch operations. Composite construction brought several advantages specific to this role: reduced vibration, a quieter hull when sampling equipment is running, and smooth underwater surfaces that preserve the integrity of temperature and plankton measurements taken at keel depth.
The hull's shape prioritises long-range efficiency over outright speed. A broad stern creates the working deck space the science team requires, while maintaining sufficient stability under sail. Freeboard was kept modest, though not so low as to complicate operations in open water.
The decision to use a sailing platform was grounded in science rather than sentiment. A yacht moving under sail produces no propeller wash, no exhaust soot and no excess underwater turbulence, all of which would compromise clean water sampling. It also makes long transits between research stations possible without draining fuel reserves. The hybrid power system complements this approach. An electric drive manages low-speed manoeuvring and quiet station keeping, while a 210-PS six-cylinder diesel provides the range needed when conditions demand it. Together, the two systems let the crew tailor power output precisely to whatever work is under way.
Fitting professional scientific systems into a 22-metre hull without sacrificing stability or safety was the most demanding part of the build. The deep-water winch occupies the aft section beneath the working deck, mounted to reinforced structural frames. It can lower sampling equipment to 3,000 metres, a capability normally associated with vessels far larger than Eugen Seibold. The keel intake presented its own set of engineering problems. A route for clean seawater had to be found that avoided any contact with bilge contamination and introduced no turbulence into the flow. The solution was an intake positioned well forward, connected to a dedicated pump and a pipework circuit fully isolated from the main plumbing. Every component in that system is accessible for maintenance while at sea, a non-negotiable requirement given how long and how far Eugen Seibold operates from shore support.
Inside, the design team faced a careful balancing act. The yacht needed to remain genuinely liveable for crew and scientists on passages of up to three weeks, while also providing a cleanroom laboratory, sample freezers, electronics racks and dry work areas. The laboratory occupies a central position in the boat, where motion is least pronounced, and is sealed to protect sensitive analyses from contamination. In total, fifty percent of the interior is given over to laboratory space, comprising a wet lab, a dry lab and an atmosphere lab.
Accommodation is functional and considered. The two permanent crew members have dedicated cabins and workstations. Scientist bunks are positioned for quick access to both the deck and the lab. The galley and saloon remain recognisable as cruising spaces, though they are pared back to manage weight distribution. YYachts' characteristic minimalist aesthetic is still present, but practicality takes priority over any kind of luxury finish. Surfaces are chosen for ease of cleaning, handholds appear wherever wet weather gear is expected to be worn, and built-in storage is placed according to weight distribution rather than convention. The vessel accommodates up to eight berths in total, supporting between four and six scientists alongside two to four crew.
On deck, sailing duties and scientific operations are kept deliberately separate. Sailing controls are led forward, leaving the transom and working deck unobstructed. The winch, sampling drums and line-handling stations are positioned outboard, giving researchers room to move gear without getting in the crew's way. A high aft bulwark improves safety when working in rough conditions, and scuppers are sized to cope with the continuous washdown that seawater equipment demands.
Endurance shaped decisions at every level of the design. Eugen Seibold carries 4,000 litres of diesel and 1,000 litres of potable water, supplemented by a desalination system, giving her an autonomy of up to three weeks at sea without resupply. Battery reserves are substantial, supporting both the hybrid drive and the laboratory equipment load. Solar panels ease that burden during settled conditions. Gross weight comes in at 48 tonnes, while a 288-volt aggregate of 67 PS contributes to the electrical generation capacity. Storage for spares is generous by any measure for a yacht this size, since the field team must be capable of repairing pumps, sampling gear, plumbing and electrical systems in remote waters. That requirement was designed in from the start, with access hatches and service spaces built into areas that a conventional yacht interior would hide behind liners.
Sea trials in 2018 confirmed that Eugen Seibold sails with a predictable, stiff motion that keeps the hull secure even when the main laboratory is fully loaded and equipped. The sail plan is deliberately conservative, centred on a mainsail and headsail combination that a small crew can manage comfortably on passage. Under power, the hybrid system delivers quiet, steady propulsion. It cannot match the brute force of a commercial research vessel, but it is efficient and capable across a wide range of conditions, from mid-ocean swell to light tropical sailing.
Eugen Seibold occupies a category of her own. She is neither a production cruiser nor a conventional research ship, but a considered combination of the two. Registered under the Portuguese flag, with call sign CRA7241 and MMSI 255913282, she carries the technical specifications of a serious scientific platform within a hull that sails and handles like a well-designed offshore yacht. Her model designation is Explorer 72, with a waterline length of 22 metres, a length overall of 24 metres, a beam of 6 metres and a draught of 3.50 metres.
Every detail of her construction reflects the nature of her purpose. From the isolated keel intake to the 3,000-metre-capable deep-water winch, from the amidships laboratory to the hybrid drivetrain, the yacht was built to extend the reach of oceanographic science into regions where traditional research platforms seldom venture and where shore support is never close at hand.
