The Altura 424 was conceived as a high-end, heavy-displacement bluewater passagemaker for cruisers who refused to sacrifice comfort for capability. Drawing lines reminiscent of stout Northern European double-enders, Mercati cleverly married a heavy-displacement, full-keeled hull with an incredibly spacious, light-filled deckhouse. This design choice set the Altura 424 apart from its contemporary competitors, such as the more spartan cruiser-racers of the era, by prioritizing interior volume, substantial tankage, and all-weather protection.
Design Brief & Intent
The core mission of the Altura 424 was long-range, self-sufficient cruising. To achieve this, Mercati utilized an expansive beam of 3.80 meters and distributed that volume high and wide across the topsides. This yielded an interior layout that was revolutionary for a 40-foot boat of its era. Rather than the dark, cramped cabins common in 1970s cruisers, the Altura 424 featured a raised deckhouse salon that blurred the lines between a traditional sailboat and a trawler.
The joinery and finish quality speak directly to Ferretti’s heritage in high-end construction. Heavy, hand-laid fiberglass is complemented below deck by rich, semi-gloss teak cabinetry and marine plywood bulkheads laminated directly to the hull. Cruisers are greeted by an expansive U-shaped galley and a central salon that comfortably dines eight. This emphasis on socialization and "liveability" became the hallmark of the Altura philosophy, ensuring that even during long passages in inclement weather, the crew remained warm, dry, and integrated into the vessel's primary social space.
Variations & Configurations
While sharing the same robust hull and general aesthetic as its siblings (the Altura 42 and 422), the Altura 424 refined the interior layout and propulsion options.
- Rigging Options: Although occasionally configured as a sloop for simpler sail handling, the Altura 424 is most famous in its ketch configuration. The ketch rig split the sail plan across two aluminum masts, which allowed shorthand crews to easily balance the sail area in heavy weather by sailing under a "jig and jigger" configuration (mainsail furled, using only the genoa and mizzensail).
- Accommodation Layouts: The layout is optimized as a three-cabin, two-head cruiser. The forward V-berth functions as the master cabin, complete with a private head. Uniquely, the lateral passageways house two side cabins equipped with twin bunk beds. Many cruising couples choose to convert one of these side cabins into a dedicated workshop or storage locker, highlighting the model's adaptability for long-term cruising.
- Propulsion and Steerage: The Altura 424 features a dual steering station layout. Sailors can control the vessel from the secure, elevated interior helm during foul-weather motoring or step out to the aft cockpit steering station in fair weather. Mechanical configurations varied; some models were built with single heavy-duty diesels (such as a 65 HP Mercedes/Nanni unit), while others utilized twin engine packages (such as twin 63 HP diesels) turning dual shafts for superior close-quarters maneuvering.
Sailing Performance & Handling
With a displacement hovering around 16,000 kg (over 35,000 lbs), the Altura 424 is a dedicated heavy-displacement motorsailer. Under sail alone, this substantial mass requires a decent breeze to get moving; in light airs under 10 knots, the boat can feel sluggish and will rely on its engine to maintain cruising speed. However, once the wind rises above 15 knots, the hull finds its stride.
Its long, full-keel design provides exceptional directional stability, allowing the boat to track straight downwind with minimal input from the helm or autopilot. The physical trade-off is a wider turning radius and less agility when tacking compared to modern fin-keel designs. The boat’s extremely high comfort ratio is where it shines: its heavy displacement and traditional hull lines easily slice through choppy seas. There is very little pounding or violent motion, which significantly reduces crew fatigue on multi-day passages.
Cruisers should treat the Altura 424 as a true motorsailer, utilizing the auxiliary power to maintain a steady 6 to 7 knots when sailing angles are unfavorable. The massive fuel capacity of 1,000 liters paired with a 930-liter freshwater tank guarantees an exceptional range under power alone, allowing owners to bypass light-wind zones with confidence.
Known Issues & Triage
Maintaining a vessel of this vintage requires an understanding of late-1970s production techniques.
- Osmosis Vulnerability: Early fiberglass layups from this era are susceptible to osmotic blistering. Prospective buyers should inspect the hull for signs of blistering. Many surviving models have undergone full hull peels and barrier-coat treatments, which should be verified during survey.
- Teak Decks: Many Altura 424s left the factory with laid teak decks. Over the decades, the screws and bedding compounds degrade, leading to water intrusion into the underlying sub-deck. Re-decking or removing the teak, filling the screw holes, and applying non-skid is a common, labor-intensive refit.
- Dual Steering Hydros and Linkages: The crossover systems linking the interior and exterior helms are subject to wear. Cable linkages must be inspected for fraying, and hydraulic systems must be checked for slow leaks or pressure drops, which can cause play at the helm.
- Fuel Tank Corrosion: The immense 1,000-liter fuel capacity is typically held in steel tanks. Condensation build-up over forty years can cause internal corrosion at the bottom of the tanks, which is difficult to detect without an inspection camera.
Modernization & Upgrades
Veteran owners of the Altura 424 focus their refits on improving self-sufficiency and low-speed handling to modernize the cruising experience.
- Electrical Systems & Solar: The original alternators and lead-acid banks are commonly swapped for high-output alternators, smart regulators, and LiFePO4 battery banks. Due to the wide cabin top and aft deck areas, owners can easily mount substantial solar arrays to run modern 12V refrigeration and diesel heaters (like Webasto units) without running a generator.
- Bow Thruster Additions: Maneuvering a 16-ton full-keel boat in tight, modern marinas can be nerve-wracking, especially in reverse. Retrofitting a powerful tunnel bow thruster is one of the most common and valuable upgrades performed on this hull, transforming its dockside handling.
- Rigging Conversions: Upgrading the heavy headsails to modern roller-furling units and adding lazy jacks with stack-packs for the mainsail and mizzensail significantly simplifies shorthand handling.
The Verdict
The Ferretti Altura 424 remains an iconic example of the classic Italian motorsailer, combining robust construction with Mediterranean design flair. It is not a boat for the racer or light-wind sailor, but for the cruiser seeking a seaworthy, liveaboard platform capable of safe, all-weather passages, it represents an exceptional value.
Pros:
- Extremely heavy-duty GRP hull construction with excellent motion comfort in rough seas.
- Massive fuel (1,000L) and water (930L) capacities for long-range independence.
- Unique raised deckhouse with a secondary interior helm station for all-weather passage making.
- Highly spacious three-cabin interior layout that is highly liveable for families or guests.
- Strong brand pedigree and classic aesthetic styling that holds its value well on the brokerage market.
Cons:
- Heavy displacement and full keel result in sluggish sailing performance in light winds.
- Poor backing behavior and tight-quarters maneuverability without a bow thruster.
- Complex maintenance associated with dual-helm steering systems and twin engines (on some models).
- Risk of deck leaks and core damage if original teak decks have not been addressed.
