Irwin 28 Information, Review, Specs

Sailing Performance & Handling

The Irwin 28 is characterized by its remarkable stability, owing much to a high ballast-to-displacement ratio that reaches approximately 41% on later models. With a displacement ranging between 7,800 and 7,900 pounds and a ballast of 3,000 to 3,200 pounds of lead, the boat is exceptionally stiff for its size. According to editorial insights from Sail Far Live Free, the boat feels "in the groove" when close-hauled, biting in effectively just off the wind. Its Sail Area-to-Displacement (SA/Disp) ratio of approximately 16.07 (for the Mark I) places it squarely in the moderate coastal cruising category.

Handling is generally predictable, though the boat does exhibit notable prop walk to starboard in reverse, a common trait for its hull and rudder configuration. The rudder is mounted on a skeg, providing better protection and tracking than a spade rudder, though it lacks the extreme maneuverability of a pure racer. Owners often note that while the boat tracks well, it requires precise sail trim to balance the helm, as weather helm can build quickly if the mainsail is not properly reefed in winds exceeding 15–18 knots. The option for a fixed fin keel (4'6" draft) or a keel/centerboard (3'0" board up) allowed the 28 to be tailored for either the deep-water Atlantic coast or the shallow gunkholes of the Florida Keys.

Interior Comfort & Variations

The Irwin 28 underwent significant changes throughout its production lifecycle, primarily focused on interior volume. The Mark I and II models featured an 8-foot beam, while the Mark IV (introduced in 1976) was widened to a 9-foot beam, drastically increasing the cabin's living space. The interior layout is a classic arrangement for its era: a V-berth forward with a privacy door, followed by a surprisingly large enclosed head to port.

The main salon typically includes a settee that converts to a berth and a galley area featuring a stainless steel sink and a top-loading icebox. In the Mark IV variants, the extra foot of beam allows for better flow around the companionway and deeper storage lockers. Headroom is generous for a 28-footer, generally hovering around 6 feet, which allows for a "big boat" feel. One notable design quirk mentioned in official resources is the lack of an external anchor locker on many early units; instead, the rope and chain locker is accessed only through the V-berth, requiring some creativity for modern cruisers who prefer deck-accessible ground tackle.

Popular Mentions & Media

While the larger Irwin 52s and 65s often dominate the spotlight in nautical literature for their world-cruising exploits, the Irwin 28 holds a sentimental place in the American sailing community as a gateway boat. It is frequently cited in regional sailing publications as a primary example of the 1970s "production boom" boat. The model gained renewed attention in digital media through long-form technical reviews that highlight its longevity and value on the second-hand market.

Known Issues & Buyer’s Checklist

Prospective buyers should focus their inspections on several age-related areas common to the Irwin 28:

• The "Smiling" Keel: Reports on technical forums indicate that the joint where the lead keel meets the fiberglass hull stub can develop a crack (often called a "keel smile"). While frequently just a sign of old bedding compound, it can indicate loose keel bolts or compression issues in the hull grid that require immediate structural attention.
• Deck-to-Hull Joint: The perforated aluminum toe rail is a common source of leaks. Because the chainplates are through-bolted to the hull grid rather than just a bulkhead, they are structurally robust, but the deck penetrations around them are prone to water ingress if not regularly re-bedded.
• Mast Step Compression: On deck-stepped models, the mast sits on a compression post. Over time, the fiberglass cabin top or the wooden support blocks beneath the post can rot or compress, leading to a "sagging" appearance in the deck and slack in the standing rigging.
• Engine Transition: Most Irwin 28s were originally equipped with the Universal Atomic 4 or the Volvo MB10A gasoline engines. While many have been repowered with diesels, original gas engines require careful inspection of the fuel system and exhaust manifold for safety.

Community & Resources

The Irwin 28 is supported by a robust and active ownership network. IrwinYachts.com remains the primary technical archive, maintained by individuals with deep historical ties to the company. This site provides access to original brochures and manuals that are essential for restoration projects. Additionally, the Irwin Owners United group serves as a dedicated repository for technical drawings and mechanical guides specifically for the 28-foot model, including carburetor diagrams and rudder specifications.

The Verdict

The Irwin 28 is a sturdy, over-ballasted coastal cruiser that offers an excellent balance of comfort and "sea-kindly" performance for its size. While it may require modernizing of its deck hardware and anchoring systems, it remains a high-value entry point for coastal sailors.

Pros:

• High ballast ratio makes for a very stable and stiff platform in a breeze.
• The Mark IV version offers exceptional interior volume for a 28-foot boat.
• Thick, hand-laid fiberglass hull construction provides long-term durability.
• Versatile draft options (especially the centerboard version) for shallow-water cruising.

Cons:

• Lack of an external anchor locker is a major inconvenience for cruising.
• Prop walk in reverse can make close-quarters maneuvering challenging for beginners.
• Common leaks at the toe rail and chainplates can lead to deck core issues if neglected.
• Aging original gasoline engines may require replacement or significant maintenance.