Design Brief & Intent
The Corsair 24 Mark II was engineered for the sailor who refuses to choose between high-speed racing and family weekend adventures. In the context of Corsair’s own lineup, it was conceived as a lighter, simpler, and more agile alternative to the trailblazing F-27. While the F-27 was an exceptional pocket voyager, its weight and size made single-handed trailering and launching a physical chore. The 24 Mark II, by contrast, was optimized for effortless ramp launching and could be rigged from trailer to water by one person in under forty minutes. Against the monohull sportboats of its era—such as the Melges 24 or J/80—the Corsair offered comparable or superior speed downwind, unmatched initial stability, and a dry cabin that made weekend cruising a genuine possibility.
Below deck, the character of the interior is clean, Spartan, and highly functional. Farrier minimized weight by using gelcoated surfaces and a marine carpet liner (affectionately termed "mouse fur" by owners) that provides thermal insulation while accepting Velcro-backed storage pockets. The layout features a compact forward V-berth and two parallel single quarter berths in the main cabin, technically accommodating up to four adults, though it is far more comfortable as a double-handed pocket cruiser.
Cruising amenities are intentionally modular. The galley is minimal, typically consisting of a slide-out molded fiberglass module housing a single-burner non-pressurized alcohol stove and a small sink. A portable chemical toilet is tucked beneath a hinged section of the settee. Because these heavy components are removable, racers can easily strip the boat down to its absolute minimum weight to optimize performance on the racecourse.
Evolution & Technical Variations 5
The transition from the F-24 Mark I to the Mark II was defined by several critical structural and aerodynamic refinements. The most significant physical change was the replacement of the Mark I’s heavy, interior-stealing centerboard with a high-aspect composite daggerboard. This shift drastically cleaned up the cabin sole by shrinking the board’s trunk footprint. Simultaneously, the daggerboard improved lift and pointing angles when sailing upwind.
The Mark II also introduced a standard rotating wing-section aluminum mast. This spar rotates automatically as the mainsail is trimmed, ensuring the apparent wind meets the narrowest possible profile, which virtually eliminates mast-induced turbulence across the mainsail’s luff.
The main hull shape underwent a significant redesign under Farrier’s eye. The Mark II was given a finer entry bow to slice through chop, a rounder U-shaped midsection, and a wider, flatter transom. The flat aft section encourages early planing downwind and dampens pitching, while the transom sits clear of the water when at rest to minimize drag-inducing wetted surface area.
In terms of draft, the configuration is highly versatile. With the daggerboard and transom-hung rudder fully extended, the boat draws 4 feet 8 inches, giving it excellent bite in the water. With the foils retracted, the draft is reduced to a mere 12 inches, allowing the boat to be sailed into thin water, run right onto sandy beaches, or launched in shallow ramps.
Sailing Performance & Handling
The sailing characteristics of the Corsair 24 Mark II are defined by its remarkable physical ratios. Displacing just 1,690 pounds dry, the boat boasts an eye-watering Sail Area-to-Displacement (SA/Disp) ratio of 41.04, placing it squarely in the high-performance category. The physical consequence is a boat that behaves like a dinghy on steroids 5. It responds instantly to a puff of wind, transitioning from displacement sailing to an effortless plane in double-digit breezes. Downwind, under a large asymmetrical spinnaker or a screecher flown from the retractable aluminum bowsprit, the boat routinely logs speeds of 15 to 20 knots, easily pacing monohulls twice its size.
Its Displacement-to-Length (Disp/LWL) ratio of 57.54 highlights its ultra-light, low-drag hull design. The helm is exceptionally light and communicative, requiring only a light touch on the tiller extension. The Capsize Screening Ratio of 6.02 and Comfort Ratio of 2.36 must be interpreted through a multihull framework. While a comfort ratio of 2.36 on a monohull would indicate an exhausting, motion-sensitive ride, the trimaran’s 17-foot 11-inch beam provides massive initial stability.
The boat sails with very little heel—typically staying under 10 degrees—which significantly reduces crew fatigue. While the motion in short, steep chop can be lively and wet, the boat’s ability to slice through waves rather than bounce over them makes for an incredibly secure, confidence-inspiring ride.
Mechanical Integrity & Triage
Decades of active use have revealed a few highly specific structural and mechanical areas that require diligent monitoring. Chief among these is the compression pad system. The folding beams (akas) are subjected to immense inward compression forces under sail, which can reach up to 20,000 pounds. Plastic or wood compression pads are fitted between the inner ends of the beams and the hull pads to absorb this force. Over time, these pads can wear, compress, or fall out. If a gap wider than 1/32 of an inch develops, the load is transferred directly to the Upper Folding Strut brackets. This can cause severe, expensive structural cracking in the fiberglass brackets. A clear diagnostic sign of pad failure is a persistent creaking noise coming from the inner beam ends under load.
On early Mark II models produced prior to 1998, cosmetic gelcoat crazing can develop where the beams bolt to the deck. This was often caused by the factory positioning the compression pads slightly too high on the corner radius, creating a localized point load.
Additionally, the horizontal seams where the upper and lower halves of the carbon or fiberglass folding beams are bonded can split or open over time due to rig flex. The accepted triage routine involves prying the seam open slightly with a hacksaw blade, thoroughly cleaning and de-waxing the void, and injecting a high-strength methyl methacrylate structural adhesive (such as Devcon or Plexus) to re-establish the bond.
Owners must also inspect the transverse foam-core bulkhead located beneath the cockpit sole. This bulkhead takes massive tensile loads from the lower folding mechanism. If the fiberglass tape bonding this bulkhead to the hull shell begins to delaminate, the hull sides will flex under sail, eventually leading to structural fatigue. A routine check with a flashlight under the cockpit sole is necessary to ensure the fiberglass fillets remain solid and crack-free.
Modernization & Outfitting
The enduring popularity of the Corsair 24 Mark II has fostered a highly active aftermarket and a dedicated owner community focused on modernizing the platform. One of the most common modern upgrades is the electrification of the auxiliary propulsion. Veteran owners are increasingly swapping out heavy, high-maintenance 5-to-8-horsepower gas outboards for lightweight, high-torque electric outboards, such as the Torqeedo Travel series. Because the trimaran has incredibly low hull resistance, these electric motors provide plenty of thrust for docking and maneuvering without the weight, smell, or reliability issues of small gas engines.
To support these electric outboards and modern marine electronics, owners frequently upgrade the factory electrical system. The standard lead-acid battery is routinely replaced with a lightweight 50Ah to 100Ah LiFePO4 (Lithium Iron Phosphate) battery. These lithium banks are paired with flexible, walk-on marine solar panels (typically 50W to 100W) mounted flush on the cabin top or on the flat surfaces of the outer floats (amas). This setup provides a self-sustaining power grid that easily handles GPS chartplotters, LED navigation lights, and VHF radios without adding unnecessary weight.
Upgrades to the rig are also popular. Many owners swap out the original stainless-steel wire side shrouds for high-tech synthetic rigging made from heat-stretched Dyneema (such as Dynex Dux). This modification sheds significant weight aloft, which directly reduces the boat’s pitching motion in chop.
Additionally, replacing older dacron sails with modern laminate sails featuring a pronounced "square-top" mainsail profile maximizes light-air performance. The square-top design has the added benefit of twisting off and automatically shedding power when hit by heavy gusts, providing an essential safety margin.
The Verdict
The Corsair 24 Mark II remains an iconic and highly sought-after model on the brokerage market, retaining its value exceptionally well due to its quality construction and unmatched versatility. It delivers sports-car performance and genuine double-digit cruising speeds in a package that is easy to trailer, launch, and store. While its cabin accommodations are strictly limited to "camp-style" cruising, the trade-off is an incredibly fun, safe, and stable platform that can easily be beached for family outings. For sailors prioritizing speed, ease of ownership, and shallow-water access over interior luxury, this trimaran remains an elite choice.
- Thrilling, high-performance sailing with consistent double-digit speed and easy downwind planing.
- Patented folding system allows for effortless trailering and quick ramp launching.
- Extreme shallow-draft capability with foils retracted, allowing beaching and thin-water exploration.
- High-quality, lightweight vacuum-bagged foam core construction.
- Strong, active one-design class association and excellent resale value.
- Very cramped interior with sitting-only headroom and minimal cruising amenities.
- Critical folding mechanism and compression pads require regular, diligent inspection and maintenance.
- Active, lively motion in chop can feel wet and nervous compared to heavy monohulls.
- No private head compartment; relies on a basic chemical toilet under the berth cushion.
