Gulfstar 50 Information, Review, Specs

Sailing Performance & Handling

The Gulfstar 50 is a quintessential heavy-displacement cruiser, designed for momentum and "sea-kindliness" rather than light-air agility. Most hulls were rigged as ketches, though a sloop/cutter configuration was available for those seeking better upwind performance. According to veteran yacht reviewer John Kretschmer in Cruising World, the boat is characterized by a "predictable motion" in heavy seas, a result of its substantial 35,000-pound displacement and a moderate-to-deep fin keel.

With a Sail Area/Displacement (SA/Disp) ratio hovering around 15.5, the Gulfstar 50 requires a stiff breeze—typically 12 knots or more—to truly wake up. However, once moving, its high Displacement/Length (D/L) ratio provides exceptional tracking. Owners often report that the ketch rig allows for a versatile "reefing by the numbers" approach, dropping the mainsail and sailing under jib and mizzen in heavy weather, which keeps the boat balanced and reduces weather helm. The steering is generally described as heavy but reliable, utilizing a robust cable-and-quadrant system that provides enough feedback for the helmsman to feel the boat's trim.

Interior Comfort & Variations

The interior of the Gulfstar 50 was revolutionary for the mid-1970s, offering a level of volume that few competitors could match. The most common layout features three private staterooms: a V-berth forward, a bunk-room to port, and the famed "Great Cabin" aft. This aft master suite, accessed via a walk-through galley or a navigation station passage, often includes a queen-sized berth and a private head with a dedicated stall shower.

The vessel underwent three distinct evolutionary phases, known as the Mark I, Mark II, and Mark III. The Mark I models often featured significant amounts of Formica and early fiberglass techniques. As the model matured into the Mark II and III, the builder transitioned toward more traditional teak joinery and improved ventilation. The Mark II introduced a more refined deck layout, while the Mark III is often the most sought-after by modern buyers due to its upgraded interior finish and improved tankage access. A sibling variant, the Gulfstar 47 Sailmaster, utilized a similar design philosophy but on a slightly smaller scale, catering to owners who wanted the Gulfstar 50’s aesthetics without the 50-foot maintenance profile.

Known Issues & Buyer’s Checklist

Prospective buyers of a Gulfstar 50 must account for the age of the vessel and specific manufacturing practices of the late 1970s. A critical area for inspection is the fuel and water tankage. Many 50s were built with black iron fuel tanks that are prone to internal corrosion over 40+ years; because these tanks were often glassed into the hull structure, replacement can be a major "engine-out" surgical project.

The deck is another high-priority inspection point. Like many production boats of the era, Gulfstar used a balsa or plywood core for the decks. Areas around the chainplates, stanchion bases, and the mizzen mast step are notorious for moisture ingress, which can lead to core delamination and "soft spots." Additionally, the chainplates themselves are often glassed into the bulkheads, making a visual inspection for crevice corrosion difficult without invasive measures. Finally, the original Perkins 4-236 or 6-354 diesel engines are legendary for their longevity, but buyers should check for "weeping" at the manifold and ensure the cooling system hasn't suffered from decades of saltwater scale buildup.

Community & Resources

Owners of these vessels are supported by a dedicated community that preserves the technical history of the Lazzara-built boats. The Gulfstar Owners Club remains the primary hub for technical data, offering digitized versions of original blueprints and plumbing schematics that are essential for restoration projects.

The Verdict

The Gulfstar 50 stands as a testament to an era when "bigger was better" for the American cruising family. While it may lack the technical sophistication of a modern carbon-fiber yacht, its robust hull and cavernous interior make it a premier candidate for a liveaboard platform or a budget-conscious circumnavigator.

Pros:

• Exceptional interior volume with a true master aft cabin.
• Heavy displacement provides a comfortable, stable ride in offshore conditions.
• Proven blue-water pedigree with many hulls having completed successful circumnavigations.
• The ketch rig offers versatile sail plan options for short-handed crews.

Cons:

• Aging black iron fuel tanks are difficult and expensive to replace.
• Standard balsa-cored decks are prone to delamination if hardware isn't re-bedded.
• The heavy hull is sluggish in light winds and requires significant power to move.
• Chainplate access is restricted, complicating critical safety inspections.