Cornish Crabbers 24 Mk III Information, Review, Specs

Sailing Performance & Handling

The transition to a David Thomas design fundamentally altered the handling characteristics of the 24-foot platform. According to an editorial review by Yachting Monthly, the Mk III is notably stiffer and faster than the older Mk I and Mk II variants. While it retains the traditional gaff rig (though a Bermuda rig was offered as an option), the hull shape is much more efficient. The boat utilizes a heavy steel lifting keel—weighing approximately 350kg—which allows for a shallow draft of just 0.71m (2’ 4”) when up, yet provides excellent stability and upwind performance when lowered to its full 1.5m (4’ 11”) depth.

In terms of sea-kindliness, the Mk III benefits from a relatively high displacement-to-length ratio, which gives it a predictable and steady motion in a seaway. The lead-ballasted keel and wide beam ensure that the boat stands up well to its canvas. Sailors moving from lighter, modern fin-keelers often find the Mk III’s tracking to be exceptional, requiring less constant attention at the helm. The gaff rig, while more complex than a standard sloop, provides a massive amount of sail area for light-air performance, particularly when the reaching staysail is deployed.

Interior Comfort & Variations

The Mk III’s interior was a primary driver for the redesign, addressing the somewhat cramped quarters of the earlier models. By pushing the beam to 2.70m (8’ 10”), David Thomas created a cabin that feels remarkably spacious for a trailer-sailer. The layout typically features four berths: two full-length settees in the saloon and a generous double V-berth forward. Unlike many boats in this size bracket, the Mk III includes a proper heads compartment with a sea toilet and a dedicated galley area featuring a two-burner stove and oven.

Material quality remains a hallmark of the Cornish Crabbers brand, with extensive use of teak or oak joinery and high-quality upholstery. The headroom is approximately 1.78m (5’ 10”), which is impressive for a 24-foot boat with such a low profile. Sibling models built on this design philosophy include the Cornish Crabber 26, which offers standing headroom and a separate aft cabin, and the smaller Shrimper 21, which shares the modern David Thomas hull DNA but in a more compact, easily trailerable package. The Mk III was also produced in a "Bermuda" version, which replaced the gaff rig with a modern masthead sloop configuration for sailors seeking simpler sail handling.

Popular Mentions & Media

The Cornish Crabber 24 Mk III has maintained a steady presence in the British yachting press as the "benchmark" for traditional-looking GRP cruisers. It has been featured extensively in Classic Boat Magazine, where it is often cited as the bridge between old-world craftsmanship and modern resin-infusion technology. While it has not been the subject of a specific high-profile circumnavigation book, it is a staple of the "Small Boat Sailing" movement on YouTube and in coastal cruising blogs, frequently highlighted for its ability to "creek crawl" in areas like the East Coast of England and the French canals.

Known Issues & Buyer’s Checklist

Prospective buyers of a Cornish Crabber 24 Mk III should focus their inspections on the specific mechanical systems that define this model. While the GRP construction is notoriously robust, the following areas require attention:

• Lifting Keel Mechanism: The heavy steel plate is operated by a manual winch. Inspect the pivot bolt for wear and ensure the stainless steel wire cable is not frayed, as these are under significant load.
• Wooden Spars: Most Mk III models come with Sitka Spruce spars. If the varnish has been neglected, water can penetrate the grain, leading to "blackening" or rot. Check the spreaders and the gaff jaws for structural integrity.
• Engine Maintenance: The standard Yanmar 3YM20 (21hp) is a reliable workhorse, but the engine bay is tight. Check for salt-water corrosion on the heat exchanger and ensure the sail-drive seal (if equipped) or traditional shaft gland is not leaking.
• Bowsprit Hardware: The retractable bowsprit is a core feature but puts immense strain on the bow fittings. Look for stress crazing in the gelcoat around the gammon iron and the cranse iron.

Community & Resources

Owners of the 24 Mk III are supported by a very active community. The Cornish Crabbers Club is the primary resource for technical manuals, social rallies, and historical data. This organization is vital for new owners, as it provides a repository of knowledge regarding rig tuning and specific modifications for the David Thomas-era boats.

The Verdict

The Cornish Crabber 24 Mk III is a rare specimen that successfully marries the aesthetic of the 19th century with the performance of the 21st. It is an ideal vessel for the sailor who wants a "proper" boat that can handle a blow but still wants to tuck into a shallow anchorage where modern fin-keelers cannot go.

Pros:

• Exceptional build quality and high resale value.
• Versatile draft thanks to the heavy lifting keel.
• Faster and more stable than earlier 24-foot iterations.
• Comfortable, high-quality interior suitable for weekending or coastal hops.

Cons:

• Maintenance intensive if equipped with wooden spars.
• The gaff rig requires more "string-pulling" and knowledge than a simple sloop.
• Relatively expensive on the used market compared to mass-produced 24-footers.