Irwin 33 Mk II Information, Review, Specs

Sailing Performance & Handling

The Irwin 33 Mk II is characterized by its stability and predictable handling, a result of its generous beam and Ted Irwin’s background in competitive racing. The boat was offered in two primary keel configurations: a deep fin keel for better windward performance and a shoal-draft centerboard model. According to technical data preserved by the Irwin Yachts resource center, the centerboard version draws only 3' 10" with the board up, making it an exceptional choice for thin-water cruising in the Bahamas or the Florida Keys.

Under sail, the Mk II utilizes a masthead sloop rig. With a displacement of approximately 11,000 pounds and a sail area-to-displacement ratio that sits in the "moderate cruiser" range, it requires a decent breeze to reach hull speed. However, owners frequently note that the boat carries its canvas well in heavier air, feeling "stiff" rather than tender due to the hull's hard chin-like flare above the waterline. While it lacks the ultimate pointing ability of a dedicated IOR racer, it tracks well and offers a dry ride compared to narrower contemporaries of the same era.

Interior Comfort & Variations

The primary selling point of the 33 Mk II was its interior volume, which rivaled many 36-footers of the time. By utilizing an 11' 2" beam—exceptionally wide for a 33-foot boat in 1978—Irwin created a cabin that felt cavernous. The layout typically features a standard V-berth forward, followed by a full-width head and hanging lockers. The main salon utilizes a U-shaped dinette to port and a straight settee to starboard, providing ample seating for a crew of six.

A notable sibling to this model is the original Irwin 33 (Mk I), which featured a more traditional aesthetic and a narrower beam. The Mk II’s "Mk II" designation often confused buyers, as it was produced alongside the emerging "Citation" series, specifically the Citation 34, which shared some of the Mk II's design DNA but featured a more contemporary, streamlined deck mold. The Mk II’s interior was finished with an abundance of teak plywood and solid teak trim, a hallmark of 1970s American production boats, though later hulls began to incorporate more molded fiberglass liners to simplify maintenance.

Known Issues & Buyer’s Checklist

Prospective buyers of an Irwin 33 Mk II should prioritize a structural survey focusing on the following areas typical of Irwin’s construction methods during this period:

• Deck Core Integrity: Like many boats of this era, the Mk II used a balsa-cored deck. Soft spots are frequently found around the chainplates, stanchion bases, and the mast step. Water intrusion here can lead to significant delamination if left unchecked.
• Mast Step Compression: The load of the deck-stepped mast is transferred to the keel via a compression post. It is vital to inspect the base of this post and the structural grid beneath it for signs of rot or crushing, which can cause the deck to sag and the rig to lose tension.
• Centerboard Assembly: On shoal-draft models, the centerboard trunk, pivot pin, and lifting cable are high-wear items. Owners on technical forums often report that the board can rattle if the bushings are worn, and the cable should be replaced every few years to prevent the board from dropping and becoming stuck.
• Chainplate Anchors: Inspect the fiberglass knees where the chainplates are bolted. In some hulls, these areas were prone to "crazing" or stress cracks if the boat was driven hard in heavy seas.

Community & Resources

The Irwin 33 Mk II benefits from one of the most dedicated owner communities in the classic plastic segment. The Irwin Yachts website serves as the primary technical archive, offering digitized versions of original brochures and limited parts lists. While no longer in production, the simplicity of the boat's systems makes it a popular candidate for DIY refits, with much of the technical support handled through the Irwin Sailboat Owners group on various social platforms.

The Verdict

The Irwin 33 Mk II remains a high-value option for coastal cruisers who prioritize living space and shallow-draft capability over pure racing pedigree. While it requires a vigilant eye for deck and core maintenance, its robust hull and clever layout offer a level of comfort rarely found in other sub-35-foot vessels from the late 1970s.

Pros:

• Exceptional interior volume and headroom for its length.
• Shoal-draft centerboard version is ideal for Florida/Bahamas cruising.
• Predictable and stable handling in a variety of wind conditions.
• Strong community support and availability of technical manuals.

Cons:

• Potential for balsa core rot in decks and cabin house.
• Original Atomic 4 gasoline engines (found in early Mk IIs) require careful maintenance or diesel repowering.
• Moderate pointing ability compared to narrower-beamed performance cruisers.