Design Brief & Intent
Ian Proctor designed the Eclipse Mk II for the cruising sailor who refused to sacrifice sailing performance for accommodation. While competing boats of the era favored boxy, high-freeboard hulls to maximize cabin volume, Proctor gave the Eclipse a sleek, low-profile hull with a semi-flush deck. This reduced windage and created a striking, aggressive aesthetic, though it came at the cost of interior headroom, which is limited to just 4 feet 9 inches.
Despite the low-profile coachroof, the interior arrangement is a masterclass in space planning. It features a functional four-berth layout consisting of a forward V-berth and two saloon quarter-berths. The joinery features traditional British teak veneers and wood trim that, when well-maintained, provide a warm and inviting cabin environment. The compact interior is also equipped with a small galley area, featuring a two-burner stove and a sink, alongside a dedicated space for a marine head—a luxury rarely found on boats of this length. Ultimately, the design was aimed squarely at coastal passage-makers and weekenders who valued speed, windward performance, and the ability to explore shallow bays.
Variations & Configurations
While the fundamental hull shape remained consistent throughout its production, the Eclipse Mk II was built with minor configuration differences to suit various sailing styles. The vast majority of the fleet was equipped with a high-aspect, fractional sloop rig. This configuration allows for smaller, easily managed headsails that simplify single-handed tacking, though a few masthead-rigged variants were produced for sailors looking to maximize light-wind performance with larger genoas.
The primary keel configuration is a vertical-lifting "drop" keel featuring a bulbed profile carrying 798 pounds of iron ballast. This system allows the draft to range from a shallow 1 foot 10 inches with the keel raised, to a deep 4 feet 10 inches when fully extended. This arrangement makes the boat ideal for beaching, trailering, and navigating shallow, mud-bottom estuaries. For purists who prioritized structural simplicity and stiffness over shoal-draft versatility, a very small number of fixed-fin keel versions were manufactured, though these represent a minor fraction of the secondary market.
Sailing Performance & Handling
The sailing characteristics of the Eclipse Mk II are heavily influenced by Ian Proctor’s extensive background in high-performance dinghy design. With a displacement-to-length (D/L) ratio of 148.51, the boat is situated firmly in the light-displacement category. It is incredibly responsive to the helm, accelerates quickly in light puffs, and easily out-points heavier pocket cruisers of the same vintage.
The sail area-to-displacement (SA/Disp) ratio of 16.6 underscores a sporty, easily driven hull that handles light-to-moderate breezes beautifully. With a ballast-to-displacement ratio of 33.26%, the Eclipse displays respectable initial stiffness when the lifting keel is fully lowered, but it remains a lively boat. The low comfort ratio of 12.18 and capsize screening ratio of 2.3 tell the technical story of a vessel that behaves more like a large keel-boat dinghy than a heavy ocean cruiser. The helm is communicative and highly sensitive to sail trim. In heavy weather, the boat requires active helming and early reefing to keep the heel angle under control and to prevent excessive leeway.
Known Issues & Triage
For prospective buyers evaluating a vintage Eclipse Mk II, several age-related areas require careful structural triage:
- Lifting Keel Mechanism: The vertical lifting keel is the single most critical inspection point. The cast-iron keel blade is prone to scale rust, which can cause it to swell and bind within the fiberglass keel trunk. Additionally, the lifting wire, sheaves, and manual winching system must be checked for fraying and galvanic corrosion. Any cracks in the fiberglass laminate around the keel trunk or the pivot pin housing can lead to serious water intrusion.
- Bulkhead Tabbing: Over decades of active sailing, the fiberglass tabbing securing the structural plywood bulkheads to the hull can crack or delaminate. This is particularly common in boats that have been driven hard in choppy coastal waters. Inspect the joints behind the saloon cushions and under the berths for physical separation.
- Deck Core Wetness: The semi-flush GRP deck utilizes a sandwich construction. Decades of poorly sealed deck hardware, stanchion bases, and handrails can allow water to penetrate the balsa or plywood core, leading to localized rot and soft spots on the deck.
- Window and Hatch Leaks: The large, acrylic side windows on the low-profile coachroof are notorious for leaking as the original bedding compound dries out and cracks over time.
Modernization & Upgrades
The simplicity of the Eclipse Mk II makes it an excellent platform for modern upgrades and owner-led retrofits. Because the boat was designed to utilize an outboard engine on a transom bracket rather than a heavy, space-consuming inboard diesel, drivetrain modernization is highly straightforward. Most modern owners opt for a lightweight 5 HP or 6 HP long-shaft four-stroke outboard with an integrated 12-volt charging coil, which provides ample motoring power while recharging the house battery bank.
The electrical system is another popular area for refitting. The absence of an inboard alternator makes the vessel a perfect candidate for a lithium-iron-phosphate (LiFePO4) battery conversion. Replacing heavy, legacy lead-acid batteries with a single, lightweight 100Ah LiFePO4 battery sheds weight and provides clean, long-lasting power. When paired with a flexible 50-watt or 100-watt solar panel mounted flat on the semi-flush deck, the setup can easily run modern LED cabin lights, a marine VHF radio, a depth sounder, and USB charging ports indefinitely.
The Verdict
The Proctor Eclipse Mk II is a classic, rewarding pocket cruiser that offers "thoroughbred" sailing performance in a highly manageable and economical package. While it lacks the standing headroom and expansive interior volume of more modern, bulbous designs, it compensates with a dinghy-like responsiveness at the helm and excellent light-wind performance. For the budget-conscious sailor who enjoys active trimming and wants the freedom to explore shallow tidal creeks, this Ian Proctor classic remains an exceptionally compelling choice.
Pros
- Excellent light-wind acceleration and pointing ability compared to contemporary bilge-keelers.
- Shallow-draft versatility provided by the robust, vertical-lifting keel system.
- Easily trailered and launched, significantly reducing annual slip and winter storage costs.
- Clever four-berth interior layout with a dedicated space for a marine head.
- Active and supportive owner groups providing deep technical and historical support.
Cons
- Limited interior headroom makes extended stays cramped for taller sailors.
- Requires early reefing and active helm management when winds exceed moderate strengths.
- High-maintenance lifting keel mechanism requires periodic inspection and corrosion control.
- Sleek, low-profile hull is prone to taking spray over the bow in choppy head seas.
