The Pandora International, designed by the legendary naval architect E.G. van de Stadt and manufactured by Rydgeway Marine, stands as a benchmark in the 1970s revolution of affordable, fiberglass pocket cruisers. Measuring approximately 21 feet 10 inches (6.65 meters), the International was a refined evolution of the original Pandora (often retrospectively called the MK1), featuring a wider beam and a revised deck mold to improve internal volume and stability. As a quintessential "bread and butter" boat of the British Isles, it was built to handle the choppy waters of the North Sea and the English Channel, offering a level of seaworthiness that often belied its modest dimensions. The design's success is reflected in its production longevity, eventually transitioning into the slightly modernized Pandora 700 which continued the lineage with a redesigned coachroof and internal layout.
Pandora International Information, Review, Specs

- Make
- Pandora
- Model
- International
- Builder
- Rydgeway Marine UK
- Designer
- E. G. Van de Stadt
- Number Built
- Production Year(s)
- 1973 - 1976
Sailing Performance & Handling
The Pandora International is widely regarded for its "big boat" feel, a characteristic attributed to E.G. van de Stadt’s mastery of hull balance and a relatively high ballast ratio. With a displacement of roughly 1,134 kg and nearly half of that weight situated in the keel, the boat is remarkably stiff and capable of carrying its canvas well into a freshening breeze. While most models feature a fin keel for superior lift and tacking angles, a significant number were produced with twin (bilge) keels to accommodate the drying moorings common in the UK and Northern Europe.
Under sail, the boat tracks with surprising precision. According to technical archives from Van de Stadt Design, the hull—originally marketed in the Netherlands as the "Trotter"—was optimized for efficiency in a wide range of conditions. Owners often report that the boat remains manageable even when overpowered, though it rewards early reefing to maintain a comfortable heel angle. Its helm remains light and responsive, making it an excellent platform for single-handed sailors or those transitioning from dinghies to keelboats. The sail area-to-displacement ratio is conservative by modern racing standards, but it ensures the boat remains a safe, predictable coastal hopper.
Interior Comfort & Variations
The "International" designation specifically marked an improvement in livability over its predecessor. By increasing the beam and refining the coachroof, Rydgeway Marine managed to fit a functional, albeit compact, interior suitable for weekend cruising. The standard layout features a classic four-berth arrangement: a double V-berth in the forepeak and two generous quarter berths extending aft under the cockpit seats.
The galley is typically minimalist, often consisting of a slide-out or fixed two-burner stove and a small sink. Headroom is restricted—a common trait for 22-footers of this era—requiring most adults to move about in a crouched position. However, the use of molded GRP headliners and clever storage lockers under the bunks maximizes the sense of space. Beyond the standard fin and bilge keel variations, the Pandora lineage includes the original MK1 with its narrower beam and the later Pandora 700, which featured a more "wedge-shaped" deck and an improved companionway design.
Known Issues & Buyer’s Checklist
Prospective buyers should approach the Pandora International with a focus on structural longevity, as many of these vessels are now entering their fifth decade of service.
- Deck Delamination: Like many Rydgeway builds, the deck utilizes a balsa core for stiffness. Moisture ingress around stanchion bases or the mast step can lead to core rot and "spongy" sections that require professional repair.
- Keel Bolts and Joint: On fin-keel models, the keel-to-hull joint should be inspected for "the smile"—a gap at the leading edge that may indicate loose bolts or a history of groundings. On bilge-keel versions, check the internal reinforcement ribs for stress cracks.
- Window Leaks: The original plexiglass windows were often secured with rubber gaskets that perish over time. Many owners choose to replace these with modern bolt-through or bonded acrylic panels to prevent interior water damage.
- Rudder Play: The transom-hung or pintle-mounted rudders are robust, but the bush materials can wear, leading to vibration or "clunking" at the helm.
- Rigging Age: Given the boat’s age, ensure the standing rigging has been replaced within the last 10-15 years, as the stainless steel wire can suffer from hidden fatigue where it enters the swaged terminals.
Community & Resources
The enduring popularity of the design is supported by a dedicated community, most notably the Pandora Owners Association. This organization serves as a critical repository for technical drawings, historical brochures, and maintenance advice specifically tailored to the International and 700 models. The association also organizes rallies and maintains a registry of surviving hulls across Europe.
The Verdict
The Pandora International remains one of the most cost-effective entries into "real" yachting. It balances Van de Stadt's pedigree with a robust construction that has stood the test of time, making it as relevant today for coastal exploration as it was in 1973.
Pros:
- Exceptional seaworthiness and stability for a 22-foot vessel.
- Strong class association and a wealth of technical knowledge.
- Predictable, forgiving handling characteristics ideal for novices.
- Affordable purchase price and low maintenance costs.
Cons:
- Limited headroom and cramped interior for extended cruising.
- Susceptibility to deck core saturation if neglected.
- Outboard engine wells (found on some models) can be awkward to manage in heavy seas.
Measurements
Construction & Hull
- Construction Material
- Fiberglass
- Hull Type
- Monohull Sailboat
- Keel Type
- Fin
- Rudder
- 1x Transom-Hung
- Ballast
- 960 lbs
- Displacement
- 2500 lbs
- Water Capacity
- -
- Fuel Capacity
- -
Dimensions
- Length Overall (LOA)
- 21.83 ft
- Waterline Length (LWL)
- 18.75 ft
- Beam
- 6.92 ft
- Draft
- 3.75 ft
- Max Headroom
- -
- Air Draft
- -
Rig & Sails
- Rig Type
- Masthead Sloop
- P (Main Luff)
- -
- E (Main Foot)
- -
- I (Foretriangle Height)
- -
- J (Foretriangle Base)
- -
- Forestay Length (est)
- -
- Sail Area
- 216 sqft
Calculations
- Sail Area / Displacement (SA/D) Ratio
- 18.76
- Ballast / Displacement Ratio
- 38.4
- Displacement / Length Ratio (D/L) Ratio
- 169.31
- Comfort Ratio
- 14.92
- Capsize Screening Formula
- 2.04
- Hull Speed
- 5.8 kn