To transform the classic Cruising Club of America (CCA) hull into a proprietary model, Ericson hired a young draftsman and naval architect named Bruce King. King redesigned the deckhouse, modified the rudder, added a three-inch bulwark, and altered the ballast configuration. The resulting Ericson 35-1 was a handsome, traditional full-keel cruiser that served as the yard’s flagship until it was replaced in late 1969 by the completely different, fin-keeled Ericson 35-2. With under 100 hulls produced, the Mark I remains a rare classic heavily distinct from the modern racer-cruisers that defined Ericson’s later years.
Design Brief & Intent
The Ericson 35-1 was built for safe, dependable coastal and offshore cruising at a time when the fiberglass revolution was still finding its footing. Designed to the aesthetics of the mid-1960s CCA rule, the boat features elegant, long overhangs, a narrow beam of 9.67 feet, and a graceful sheerline. This hull shape stands in stark contrast to the flat-bottomed, high-volume production cruisers of today, prioritizing aesthetic beauty and sea-kindliness over maximum interior volume.
The design modifications introduced by Bruce King were intended to modernize the Alberg parentage. King lightened the vessel by reducing the internal lead ballast by roughly 500 pounds compared to the Alberg 35, while restructuring the coachroof to feature longer, stylized windows. This trunk cabin design initially invited a trademark lawsuit from Columbia Yachts—whose window shapes were highly similar—prompting Ericson to alter later production hulls by splitting the large salon windows into two distinct ports.
The interior arrangement is traditional, utilizing warm teak joinery, structural bulkheads, and a classic layout optimized for use at sea. Because of the narrow 9.67-foot beam, the interior feels cozy and secure. The cabin offers approximately six feet of headroom, a port-side galley, and a traditional salon with opposing settees or pilot berths. Storage is plentiful, constructed from solid wood and plywood rather than the drop-in fiberglass liners that became standard in later decades.
Sailing Performance & Handling
At the helm, the Ericson 35-1 behaves exactly like the traditional heavy-displacement cruiser its dimensions suggest. With a displacement of 12,000 pounds and a water line length (LWL) of 24.08 feet, the boat carries an extraordinarily high Displacement-to-Length (D/L) ratio of 383.68. This translates to a vessel that is slow to accelerate in light air but incredibly steady and comfortable when the wind builds. The boat's Comfort Ratio of 33.1 ensures an easy, gentle motion in choppy seas, sparing the crew from the violent, jerky motion typical of modern, light-displacement hulls.
Its Capsize Screening Ratio of 1.69 indicates exceptional resistance to rolling, making the 35-1 highly seaworthy and structurally reassuring for open-ocean passages. Under sail, the Sail Area-to-Displacement (SA/D) ratio of 16.6 represents a moderate, well-balanced cruising rig. The boat tracks as if on rails due to its long, traditional full keel.
However, this tracking ability comes at the expense of close-quarters maneuverability. In a tight marina, the Ericson 35-1 has a wide turning radius, and backing down under power is notorious for being unpredictable. The full keel and heavy displacement also make it difficult to punch directly into steep head seas under power alone, requiring the crew to sail or motor-sail at an angle to maintain headway.
Known Issues & Triage
For prospective buyers, the primary focal point of any vintage Ericson 35-1 is its propulsion. The boat was originally equipped with a 30-horsepower, raw-water-cooled Universal Atomic 4 gasoline engine. While these engines are mechanically simple and easily serviced, running gasoline in a deep, vintage sailboat bilge demands meticulous safety protocols. Fuel tanks, lines, blowers, and exhaust manifolds must be strictly inspected.
Structurally, because of the boat’s age, deck core rot is a common issue. Like most builders of the era, Ericson utilized balsa-cored decks. Over decades of service, deck hardware, stanchion bases, and chainplate penetrations can leak, allowing water to saturate and rot the core. Any soft spots on deck or rust staining on the interior bulkheads indicate a need for localized recoring and rebedding.
Additionally, the rudder and the steering system require close inspection. The full-keel rudder is hung on the trailing edge of the keel, and while highly protected, the rudder pintles, gudgeons, and internal bronze or steel reinforcers are prone to crevice corrosion and wear over fifty years of immersion.
Modernization & Upgrades
Many surviving Ericson 35-1 hulls have undergone significant modernization to prepare them for continued service. The most critical upgrade is replacing the original raw-water-cooled Atomic 4 with a modern, freshwater-cooled diesel engine. Common repower choices include the Yanmar 2GM/3YM series or Beta Marine 20/25 diesels, which fit reasonably well in the existing engine space and significantly improve fuel safety, torque, and reliability.
Owners looking to cruise long-term also prioritize complete electrical overhauls. The original DC wiring and fuse panels are antiquated and pose fire risks. Upgrading to modern marine-grade tinned wire, installing blue seas breaker panels, and incorporating Lithium Iron Phosphate (LiFePO4) battery banks with smart solar charging systems are common additions that make the boat highly self-sufficient at anchor.
Finally, replacing the original aluminum window frames or aging Plexiglas portlights with modern, custom-machined replacements is a frequent upgrade to cure persistent cabin leaks and restore structural integrity to the coachroof.
The Verdict
The Ericson 35-1 is a beautifully built classic that represents the transition from traditional wooden boat design to heavy-duty fiberglass construction. While it lacks the interior volume and nimble handling of modern production cruisers, it rewards its owners with timeless CCA lines, a remarkably smooth ride, and the rugged durability of an overbuilt hull. For the sailor who values traditional aesthetics, blue-water capability, and historical pedigree, the Mark I is a rewarding classic that stands out in any anchorage.
Pros:
- Stunning classic CCA sheerline and elegant overhangs
- Heavy, solid fiberglass layup with an overbuilt hull structure
- Extremely comfortable, sea-kindly motion in rough offshore conditions
- Excellent directional stability and straight-line tracking under sail
Cons:
- Poor close-quarters maneuverability and difficult backing performance
- Heavy displacement limits performance in light air
- Narrow interior beam offers less living space than modern 35-footers
- Original gasoline engine requires high maintenance and carries inherent safety risks
