Princess 18 Information, Review, Specs

Power Performance & Handling

As a small displacement or semi-displacement hull (depending on the engine configuration), the Princess 18 was never intended for high-speed offshore racing. Instead, it offers a stable, predictable platform for inland waterways and sheltered coastal "creek crawling." Most iterations were fitted with transom mounts for outboard engines ranging from 10 to 40 horsepower, though a few were customized with small inboard petrol or diesel units.

Handling is characterized by high initial stability due to a relatively wide beam for its length. According to archival records from Marine Projects, the hull’s shallow draft allows it to navigate tidal estuaries that larger vessels in the Princess range cannot reach. At low speeds, the boat tracks reasonably well, though like many light, high-freeboard cruisers, it can be susceptible to windage when maneuvering in tight marinas. In choppy conditions, the blunt bow can be somewhat "punchy," leading to a wet ride if pushed too hard against a head sea, but the flare of the topsides does an admirable job of deflecting spray away from the cockpit.

Interior Comfort & Variations

Despite its diminutive 18-foot length, the boat manages to offer a functional "weekender" layout. The interior is dominated by a classic V-berth in the bow, which serves as a seating area with a central table during the day and converts into a double berth at night. Because the Princess 18 was built during the transition from wood to GRP (Glass Reinforced Plastic) dominance, the interior often features a blend of easy-clean fiberglass liners and warm teak or mahogany trim.

Storage is found beneath the berths and in small lockers flanking the companionway. There is no standing headroom; the cabin is designed for sitting and sleeping, with most "living" occurring in the large, open cockpit. Marine Projects produced several variations of the same hull, most notably the "Senior 18" and the slightly larger "Princess 20" (often called the Project 20), which offered a more substantial cabin structure. Some versions featured a basic galley shelf for a portable stove and a dedicated space for a chemical toilet tucked under the forward cushions.

Known Issues & Buyer’s Checklist

When inspecting a Princess 18 on the secondary market, the primary concern is the integrity of the fiberglass laminate. As a product of the late 1960s, these hulls were built with heavy hand-laid matting, but they pre-date modern osmosis-resistant resins.

• Osmosis and Blistering: Inspect the hull below the waterline for "pimpling." While rarely structural on these overbuilt hulls, extensive blistering can be a costly cosmetic fix.
• Transom Core Integrity: Since most Princess 18s use outboard power, the transom takes significant stress. Check for "flexing" when weight is applied to the engine or mounting bracket; soft spots often indicate that the internal plywood core has succumbed to freshwater rot.
• Deck Delamination: The walking surfaces are often cored with balsa or plywood. Soft or "bouncy" sections of the deck usually indicate water ingress through poorly sealed hardware (cleats or pulpit rails).
• Window Seals: The wrap-around acrylic or glass windows are notorious for leaking after decades of UV exposure, which can lead to interior woodwork rot if not addressed.

Community & Resources

Owners of these vintage vessels often find technical support and historical documentation through the Princess Owners' Club, which maintains archives on the early Marine Projects era. While there is no longer a dedicated factory parts catalog for the 18, the simplicity of the design means most hardware is generic and easily sourced. Technical discussions are also common within the Senior Marine enthusiast groups, as the hull shares nearly all its DNA with the Senior 18 cruiser.

The Verdict

The Princess 18 is a charming, entry-level classic that provides a tangible link to the heritage of one of the world’s most famous yacht builders. It is best suited for couples or solo sailors looking for a low-maintenance trailer-sailer for river and estuary exploration.

Pros:

• Historical Pedigree: A genuine "mini-Princess" with classic 1960s styling.
• Ease of Transport: Light enough to be towed by a standard family vehicle.
• Sturdy Construction: Heavy fiberglass layup is much more durable than modern light-gauge equivalents.

Cons:

• Limited Headroom: The cabin is strictly for sitting or sleeping.
• Age-Related Maintenance: Buyers should expect to spend time on resealing windows and upgrading ancient wiring.
• Engine Exposure: Most versions lack a dedicated engine box, leaving the outboard exposed to the elements and noise.