Diam 24 Sailboat Review, Specs, and Listings

VPLP Design·2014·ADH Inotec,
Diam 24 drawingBuilder drawing
Hull Type
Trimaran · daggerboard
Rig
Fractional Sloop
LOA
23.75' · 7.24 m
Disp.
992 lbs · 450 kg
First year
2014

The Diam 24 one design is a 24foot trimaran that arrived to fill a gap nobody had addressed: a multihull sportboat sitting between large highperformance cruising trimarans and small athletic beach cats. Conceived by ADH Inotec with naval architecture from VPLP, the boat was developed and refined at Port La Foret by the elite of French sailing, then selected by the Tour De France a la Voile in 2015 as a revolution in racing equipment and format. Sail Magazine named it Boat of the Year 2017, overall winner and best multihull, and the design reads as a deliberate attempt to make highspeed multihull racing accessible rather than specialist.

Measurements

Dimensions 01

Length Overall
23.75 ft
Length on deck
Waterline Length
23.75 ft
Beam
18.44 ft
Draft
4.92 ft
Maximum Headroom
Air Draft
40 ft

Construction & hull 02

Construction
Fiberglass (PVC Foam Core)
Hull Type
Trimaran
Keel Type
Daggerboard
Ballast
Displacement
992 lbs
Water Capacity
Fuel Capacity

Rig & sails 03

Rigging Type
Fractional Sloop
Mainsail luff
Mainsail foot
Foretriangle height
Foretriangle base
Forestay Length (estimated)
Sail Area
355 sqft

Calculations 04

Sail Area to Displacement Ratio
57.1
Ballast to Displacement Ratio
Displacement to Length Ratio
33.06
Comfort Ratio
1.33
Capsize Screening Ratio
7.4
Hull Speed
6.53 kn

Design and Construction

The platform's stiffness comes from non-folding beams guarantee uncompromised rigidity across the beam, a structural choice that distinguishes the boat from folding-trailerable cruisers. Central hull and floaters use a glass sandwich with PVC foam and unidirectional carbon reinforcements in polyester resin under a gelcoat finish, while the beams themselves pair the same foam-core glass sandwich with carbon and epoxy resin. Resin infusion was chosen to ensure perfect repeatability in production, and the foils follow the same carbon-reinforced epoxy and PVC foam recipe. Every part — floats and beams included — was capped at 65–70 kg so two people could assemble or disassemble the boat, a key Tour Voile requirement that Lauriot Prévost of the design side set as a hard limit. The result is a demountable 23-foot-9-inch hull with an 18-foot-6-inch beam that breaks down to a 7.3 m by 2.3 m by 1 m package.

Rig and Handling

A rotating carbon mast carries a square-top main on well-conceived efficient control lines, with a self-tacking jib and a minimized inventory of just main, jib, and gennaker — membrane black aramid for the two upwind sails, laminated polyester for the gennaker. Spreaders, simple adjustable diamond wires, and sidestays keep the rig clean, and a 16:1 cunningham gives precise luff tension. The perfectly balanced helm makes the boat lively and seaworthy, and with two rudders on each floater plus a single central daggerboard the trimaran can be sailed with the central hull clear of the water. The overall size permits 100% manual handling with no mechanical assistance, and the boat is fast in light winds yet safe in a breeze without demanding great sporting qualities from the crew.

Accommodations and Day-Sailing Role

Although marketed as a one-design racer, the Diam 24 is large and stable enough to be a comfortable daysailer for three or four people, and the cockpit is genuinely large, lending a feeling of security and size even as the hulls deliver nimble responsiveness. The layout invites step-aboard curiosity, and the manufacturer positions the boat as a safe family day sailer ideal for savouring high-speed sailing with easy handling. It is made to race with three or four aboard, and the navigation category is seaside — a boat built for coastwise sport rather than offshore passage.

Assembly, Transport, and Storage

Two people can assembles and disassembles in 1 hr with 2 people, and once disassembled it travels easily on a road trailer or tucks into the D Box, a framed container that keeps all components safe and together. Launching dollies let an owner put her in from a ramp or a beach, and all components are designed to stow inside the forward compartment and cockpit. The boat goes from strapped to the trailer to blasting along with sails up in under an hour, with straightforward toggles for attaching the floats to the hull and clean rigging keeping moving parts to a minimum.

Ownership and Support

Sales run directly from the factory for streamlined service and pricing, backed by a network of service agents in key geographic areas and a support team covering repairs, maintenance, coaching, and even turnkey regatta management. The standard package includes one-design sails, launching dolly, lines, and required gear, and a three-horsepower electric Torqeedo engine pushes the boat in and out of a mooring or up a beach. The Diam 24 one design thus spans the gap between pure racer and accessible day boat without asking the owner to become a composite specialist.

The Verdict

The Diam 24 one design is a focused answer to a real gap: a lightweight, demountable trimaran that makes multihull speed and one-design racing approachable for club sailors and families alike. Its rigidity, manual simplicity, and rapid assembly are genuine strengths, though the seaside rating and minimal accommodation keep it firmly in the day-sail and buoy-race lane rather than cruising.

Pros

  • Non-folding beams deliver uncompromised cross-beam rigidity
  • Fully demountable and road-trailerable in under an hour with two people
  • Balanced helm and twin-rudder float steering make it lively yet safe
  • One-design class selected for national-level French racing

Cons

  • Seaside navigation category limits offshore ambition
  • Minimal accommodation suits only day sailing with three or four
  • Manual handling and racing focus exclude comfort-minded cruisers

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