Sirius 310 DS Information, Review, Specs

Sailing Performance & Handling

The 310 DS challenges the "motor sailer" stigma often attached to deck saloon yachts. With a displacement of 6.3 tonnes and a substantial ballast ratio of approximately 38%, the boat is notably stiff and stable. Editorial tests by Yacht.de describe it as "pleasantly responsive" and surprisingly maneuverable, tracking well even in light northerly breezes where it can maintain speeds over 5 knots.

The standard fractional rig features a self-tacking jib (16.7 m²) and a large mainsail (26.3 m²), a configuration that makes the boat exceptionally easy to handle for solo sailors or couples. While its heavy displacement and high freeboard mean it is not a light-air racer, its hull displays a clean release with minimal transom drag. For those sailing in varied coastal conditions, the yard offered six different keel options, ranging from a deep performance fin to twin-keels for drying out in tidal harbors. Owners frequently note that the internal steering position—available as an option—is a revelation during foul-weather passages, allowing the helmsperson to navigate in a "t-shirt" while the crew remains protected.

Interior Comfort & Variations

The interior of the 310 DS is where the yacht distinguishes itself from all other 31-footers on the market. By elevating the saloon and galley, Sirius created a 360-degree panoramic view from the living area, while simultaneously opening up massive storage and cabin space beneath the floorboards. The headroom is remarkable for this size, reaching up to 2.0 meters (6ft 7in) in the saloon.

The shipyard offered at least 14 different layout variations. The "4-berth comfort" version typically places a master cabin centrally—low in the hull and close to the boat's center of motion—which provides the most comfortable sleeping experience at sea. Other variants include a two-cabin layout with a dedicated technical room or workshop under the saloon, a feature highly prized by blue-water cruisers. The level of joinery is exemplary, utilizing hand-varnished mahogany or light oak, with every cubic centimeter of the hull utilized for drawers, wine cellars, or locker space. Standing in the galley, the cook remains at the same eye level as those seated in the saloon or those outside in the cockpit, maintaining a social "one-level living" environment.

Popular Mentions & Media

The Sirius 310 DS received significant attention from the European marine press upon its launch. It was extensively reviewed by Yachting Monthly and featured in a detailed multi-part technical video series by the shipyard’s director, Torsten Schmidt, which highlighted the yacht's "double-level" engineering. It is frequently cited in editorial discussions as the benchmark for how to maximize volume in a sub-10-meter hull without compromising structural integrity.

Known Issues & Buyer’s Checklist

Prospective buyers should focus their inspections on the following technical areas:

• Volvo Engine Exhaust System: Early reports from some owners highlighted concerns regarding water ingress into the engine through the exhaust path. It is critical to verify that the high-rise exhaust loop and siphon breaks are correctly configured.
• Keel-to-Hull Joint: For models equipped with cast iron or composite keels, check for signs of rust bleeding at the joint. While the builder moved away from certain keel designs in later years, older hulls may require sandblasting and re-sealing of the keel stub.
• Window Seals: The large panoramic windows are a signature feature but also a potential point of failure. Inspect the bedding compounds for UV degradation and check for interior water staining around the frames.
• Rudder Bearing Wear: Due to the relatively large rudder surface area required to control the high-volume hull, the bearings can experience significant load. Check for play in the helm, especially on boats that have spent extensive time in high-surge environments.

Community & Resources

The primary resource for technical support and history is the Sirius-Werft shipyard itself in Plön, Germany. Unlike mass-production builders, Sirius maintains a direct relationship with nearly every hull produced, and the shipyard is known for providing historical build specifications to second-hand owners. While there is no dedicated "310 DS only" association, owners are active within the broader Sirius cruising community and participate in technical forums focused on high-end German yachting.

The Verdict

The Sirius 310 DS is a "pocket mega-yacht" that prioritizes comfort, safety, and visibility above raw racing speed. It is a niche vessel for the sailor who refuses to compromise on quality or living standards regardless of boat length.

Pros:

• Unrivaled interior volume and 360-degree visibility.
• Exceptional build quality and customizable woodwork.
• True Category A offshore capability in a 31-foot package.
• Easy to handle shorthanded with a self-tacking rig.

Cons:

• High price point on the used market compared to other 31-footers.
• Significant windage due to the high freeboard and deck saloon.
• Not a performance boat in light air due to heavy displacement.