Sirius 23 Information, Review, Specs

Sailing Performance & Handling

Under sail, the Sirius 23 is characterized by its predictable, stiff, and forgiving nature. While technical ratios like the Sail Area/Displacement (SA/Disp) ratio lean toward the conservative side, reflecting its role as a family cruiser rather than a club racer, the boat manages to maintain momentum well in light-to-moderate chop due to its relatively high displacement for a 23-foot vessel. According to historical shipyard data, the boat was offered with various keel configurations, including a fixed fin keel and a bilge keel (twin keel) version, the latter of which was particularly popular for owners in tidal regions who wished to dry out upright.

The handling is noted for being "unfussy." The rudder provides enough feedback to keep the helm engaged without becoming twitchy, a trait often cited in regional German sailing reviews of the era. Its tracking ability is commendable for a short-waterline boat, largely due to the conservative hull shape and the placement of the ballast low in the keel. Owners frequently mention that while the Sirius 23 is not a "pointing machine" in light winds, it feels remarkably secure when the breeze picks up to Force 5 or 6, where lighter coastal cruisers might begin to feel overwhelmed.

Interior Comfort & Variations

The interior of the Sirius 23 was a revelation for its time, utilizing a "max-volume" approach that allowed for four functional berths within a hull under seven meters. The layout typically features a V-berth forward, which is surprisingly spacious thanks to the boat’s generous beam carried forward, and two settee berths in the main saloon. The use of high-quality mahogany or teak veneers—a hallmark that Sirius-Werft has never abandoned—gives the cabin a warm, "ship-shape" feel that has aged better than the plastic-heavy interiors of its 1970s competitors.

Sibling models built during this era include the Sirius 24 and the slightly larger Sirius 26. While the 23 was the entry-point model, it shared the same construction philosophy as the 26, featuring a functional galley with a two-burner stove and a compact chemical or marine head located under the forward V-berth cushions. Variations were primarily seen in the cabinetry finishes and the inclusion of an inboard engine versus an outboard well, with many later 23s featuring small Bukh or Farymann diesel engines that added significant weight but improved the boat’s center of gravity and reliability in heavy weather.

Known Issues & Buyer’s Checklist

Prospective buyers of a Sirius 23 should approach the vessel with an understanding of its age, focusing on the structural integrity of the 1970s fiberglass and the specific hardware used during that period.

• Deck Core Integrity: Like many boats of this vintage, the Sirius 23 utilizes a sandwich construction in the deck. Buyers should check for "springy" or soft spots, particularly around the mast step and the chainplates, which may indicate water ingress into the balsa or foam core.
• Window Seals: The original aluminum-framed windows are prone to leaking after decades of thermal expansion. Evidence of water staining on the interior mahogany cabinetry below the ports is a common sign that the seals require replacement.
• Osmotic Blistering: While Sirius hulls were built with heavy laminates, early gelcoats from the 70s are susceptible to osmosis. A professional moisture meter reading of the hull below the waterline is essential, especially for boats kept in freshwater for long periods.
• Rudder Bushings: The transom-hung or spade rudder (depending on the specific sub-variant) can develop play over time. Excessive "clacking" when at anchor or under motor suggests the bushings or gudgeons are worn and need machining.

Community & Resources

Owners of the Sirius 23 benefit from the strong legacy of the manufacturer, which remains in business and continues to support its heritage models. The most prominent hub for technical information is the Sirius Owners' community, often found through German sailing forums where long-term owners share refit diaries and original technical drawings. While there is no standalone international "Sirius 23 Class Association," the shipyard itself, Sirius-Werft, is known for maintaining an archive of their older designs and can often provide guidance on original specifications and parts for historical models.

The Verdict

The Sirius 23 is a stout, "small-but-mighty" cruiser that offers a level of security and craftsmanship rarely found in the sub-25-foot category. It is an ideal choice for a couple or a young family looking for a trailerable coastal cruiser that can handle "real" weather.

Pros:

• Exceptional build quality and high-grade interior joinery.
• Stable and forgiving sailing characteristics, ideal for beginners.
• Available in twin-keel versions for tidal drying or shallow-water cruising.
• Remarkable interior volume for its length.

Cons:

• Dated deck hardware and window designs may require updating.
• Heavy displacement makes it slower in light-air conditions compared to modern sport-boats.
• Limited availability on the secondary market outside of Northern Europe.