Part of Lagoon’s third-generation range, the 421 draws on VPLP’s naval architecture and the marque’s partnership with Nauta Design for interior styling. It measures 41 feet 4 inches overall, with a 24-foot-7 beam and a displacement of roughly 26,830 pounds.
Every early 420 had launched with hybrid, automotive-derived propulsion. For the 421, Lagoon deliberately returned to conventional diesel power—or “the good old diesels,” as the builder put it.
Design and Construction
The 421’s hull forms mark a clear departure from those of its predecessor. Vertical bows replace the older profile, the transom skirts are much wider, and the gullwing-shaped bridgedeck is intended to part seas beneath the nacelle.
Multihulls World noted that the Bordeaux-based builder had slightly lowered the hull height and eliminated the rigid bimini that had perched high above the 420’s cockpit. In its place, Lagoon fitted a new rigid bimini extending from the coachroof. The mainsheet track is fixed to this structure, leaving the cockpit clear.
Large vertical windows, protected by the coachroof extension, provide generous light in the nacelle. Apart from the davits, there are no fittings aft of the coachroof, which keeps the aft deck uncluttered.
Rig and Handling
Compared with the 420, the 421’s sail plan grew from 97 to 103.4 square meters. A square-headed mainsail helps its light-weather performance. The mainsail measures 710 square feet, the genoa 377 square feet, and an available gennaker 753 square feet.
On the 421, the boom is the hoisted part of the hardtop, cut so that it clears the skipper’s fixed-bimini helm station without collision. The fixed top extends the living space from saloon to cockpit, while the boom could also serve as a sunbathing platform.
Charter companies could specify a short mast, considered more reassuring for inexperienced crews. With the standard rig, however, the 421’s hydrodynamically efficient hulls give it an edge the 420 lacked.
Cockpit and Accommodations
Buyers could choose either three or four double cabins. Large vertical windows brighten the saloon, while large sunlight windows are repeated in the cabins. Large, conveniently placed opening hatches provide natural ventilation throughout the interior.
Outside, wide sidedecks and a broad aft deck make it easier to move around the boat. The cockpit has a convertible table, allowing the space to serve as either a dining area or a lounge. Because the mainsheet track is mounted on the bimini, the cockpit can be devoted entirely to relaxation rather than line handling.
Propulsion and Tankage
The electric motors were finished as of the review period, and the 421’s builder returned to diesel engines. The changes from the 420 were corrective rather than remedial.
The 421 pairs twin 40-horsepower diesels with 2 x 300 liters of fuel capacity and 2 x 175 liters of water capacity.
Refits and Ownership
The rigid bimini provides a stable platform for later canvas or solar additions without altering the coachroof line.
Because charter companies could order the short-mast version, used examples may vary in rig height. It’s worth checking a particular boat against its sail plan before purchase.
The Verdict
The Lagoon 421 is a considered evolution of a flawed predecessor. It trades experimental hybrid propulsion for dependable diesels and refines the deckhouse into a lower, cleaner profile with genuinely usable covered outdoor space.
Its gullwing bridgedeck and vertical bows reflect a builder correcting course. The clear cockpit created by the bimini-mounted mainsheet is a real advantage for liveaboard use.
Pros
- Revised hulls, lower freeboard than the 420, and more efficient hydrodynamics
- Bimini-mounted mainsheet leaves the entire cockpit free for relaxation
- Choice of three- or four-cabin layouts, with plenty of natural light and ventilation
- Return to twin 40 hp diesel drives after the 420’s hybrid experiment
Cons
- Abandoned electric-propulsion option limits choices for green-minded buyers
- Short-mast charter version may fall short of performance expectations
- With no fittings aft of the coachroof beyond the davits, options for mounting gear on the aft deck are limited
