Four 21 Information, Review, Specs

Sailing Performance & Handling

The Four 21 is characterized by a relatively wide beam (2.50m) relative to its length, which provides significant initial stability—a crucial trait for a lightweight trailer-sailer. It typically carries a sail area of roughly 21 to 22 square meters. Given its displacement of approximately 1,100 kg, the boat possesses a Sail Area/Displacement (SA/Disp) ratio in the high teens or low 20s (depending on the specific load-out), marking it as a "sporty" inland cruiser.

Handling is generally described as responsive and light on the helm. Because it utilizes a swing keel (lifting centerboard) and a transom-hung rudder, the boat can be sailed in water as shallow as 0.30 meters with the board up, though performance to windward requires the full 1.30-meter draft. Technical reviews from European sailing publications highlight that the Four 21 tracks well in light air but can become "twitchy" in gusty conditions if not reefed early. The hull shape, which carries much of its beam aft, allows it to plane under the right conditions when reaching, though it is primarily designed as a displacement hull for comfortable cruising. Its sibling, the Four 24, offers a more stabilized, heavy-weather experience, whereas the 21 remains the choice for those prioritizing agility and ease of rigging.

Interior Comfort & Variations

Despite its modest 21-foot length, the Four 21 features a surprisingly functional interior designed to sleep four adults in a classic "open plan" layout. The lack of a permanent bulkhead between the V-berth and the main salon creates an illusion of greater space, a design choice common in Polish yachts of this era to prevent a "claustrophobic" feel in small hulls. The interior typically includes a small galley to port with a single-burner stove and a sink, while the starboard side often houses a compact locker or a space for a chemical toilet.

The craftsmanship of the interior varies depending on the year of production, but most models utilize mahogany or ash veneers to provide a warm aesthetic. Headroom is limited—typical for a boat of this class—requiring most adults to sit rather than stand. The Four 21 was built on a hull that shared design DNA with the larger Four 24 and the flagship Four 30. While the 24-foot variant offers standing headroom and a separate head compartment, the 21-foot model focuses on maximized storage beneath the berths and a large, unobstructed cockpit for daytime sailing.

Known Issues & Buyer’s Checklist

Purchasing a used Four 21 requires a targeted inspection of the systems unique to trailer-sailers and Polish production methods of the early 2000s:

• Swing Keel Mechanism: The pivot bolt and lifting cable are the primary points of failure. Buyers should inspect the keel trunk for signs of impact damage or stress fractures, which can occur if the boat was grounded at speed.
• Mast Lowering System: Most Four 21s are equipped with a "dead man" or A-frame mast-lowering system. Ensure the stainless steel hardware and forestay chainplates are not bent or fatigued from frequent stepping of the mast.
• Deck Core Integrity: While the hulls are generally solid fiberglass, the decks utilize a sandwich construction. Check for soft spots around the stanchion bases and the companionway, where moisture can ingress through poorly bedded hardware.
• Rudder Pintles: The transom-hung rudder is subject to high leverage. Inspect the gudgeons and pintles for play; excessive wobbling indicates that the fiberglass reinforcement on the transom may be compressing.

The Verdict

The Four 21 is a specialized tool for the sailor who values mobility and access to shallow waters. It excels as a lake-hopping weekend cruiser but lacks the displacement and heavy-duty rigging required for serious offshore work.

Pros:

• Excellent Portability: Easily towed by a mid-sized SUV and simple to launch from a ramp.
• Shallow Draft: The swing keel allows for "beachable" cruising and access to remote anchorages.
• Efficient Layout: Clever use of interior space provides genuine sleeping quarters for a small family.

Cons:

• Limited Headroom: Taller sailors will find the cabin height restrictive for extended stays.
• Lightweight Construction: Can feel under-ballasted in high winds, necessitating early reefing.
• Regional Support: Finding model-specific replacement parts outside of Central Europe may require custom fabrication.