Kelt 5.50 Information, Review, Specs

Kelt 5.50 Drawing
Make
Kelt
Model
5.50
Builder
Kelt Marine
Designer
Gilles Ollier
Number Built
1000
Production Year(s)
1976 - 1982

The Kelt 5.50, introduced in 1978, stands as a quintessential example of the "Micro Class" movement that swept through European yachting in the late 1970s. Designed by the renowned Groupe Finot, this 18-foot pocket cruiser was engineered to provide a bridge between the athletic demands of a racing dinghy and the overnight capabilities of a small yacht. Built in Vannes, France, the 5.50 was a commercial success for Kelt Marine, with over 600 units produced. It was specifically developed to adhere to the "Micro" rule—a box rule intended to create affordable, trailerable, and seaworthy racing cruisers. The hull features a wide beam relative to its length and a flat aft section, a signature of Jean-Marie Finot’s design philosophy that prioritized stability and early planing potential.

Sailing Performance & Handling

On the water, the Kelt 5.50 behaves with the agility of a large dinghy but the stability of a ballasted keelboat. With a displacement of approximately 550 kg (1,212 lbs) and a generous sail area of nearly 17 square meters, the boat possesses a high sail area-to-displacement ratio, making it exceptionally lively in light airs. According to technical archives from Finot-Conq, the boat was designed with a "dériveur lesté" (weighted swing keel) configuration, which houses roughly 150 kg of ballast in the bilge and keel. This allows the boat to be beached easily while maintaining a respectable righting moment.

In a breeze, the Kelt 5.50 is known for its ability to plane on a broad reach, a rare trait for a cruiser of its era. Tracking is generally reported as positive, though like most short-LOA vessels with a wide beam, it can become "cork-like" in a chop, requiring active helm work to maintain momentum. The rudder is transom-mounted and provides high leverage, allowing for quick corrections. While it excels in coastal hops and lake racing, the 5.50 is not intended for heavy offshore conditions; its primary strength lies in its responsive, "seat-of-the-pants" sailing experience that rewards technical trimming.

Interior Comfort & Variations

Despite its modest length of 5.5 meters, the interior of the Kelt 5.50 is an exercise in clever spatial management. The cabin provides four berths in a "V-berth" forward and two quarter berths extending aft under the cockpit seats. However, calling it a four-person cruiser is optimistic for anything beyond a weekend trip; it is most comfortable for a couple or a small family. There is no standing headroom—the vertical space is strictly for sitting—but the large companionway hatch helps mitigate any feelings of claustrophobia.

The interior is minimalist, featuring molded fiberglass liners that are easy to wipe down after a salty weekend. Storage is tucked beneath the berths, and there is usually a small area designated for a portable stove. Unlike its larger siblings like the Kelt 620 or the award-winning 7.60, the 5.50 does not feature a separate head (toilet) compartment or a full galley. Variations of the model were primarily limited to the "Cruising" and "Racing" versions, with the latter often featuring upgraded deck hardware and a taller, more fractional rig to compete in the Micro Cup circuit.

The Kelt 5.50 earned its reputation primarily through the "Micro Cup" racing circuit, where it competed against iconic designs like the First 18 and the Neptune 550. It is frequently highlighted in French sailing publications such as Voiles et Voiliers as a landmark design that democratized coastal cruising for a generation of French sailors. While it has not been the subject of major cinematic features, it remains a "cult classic" in the European second-hand market, often cited in "best starter boat" editorials for its simplicity and ease of transport.

Known Issues & Buyer’s Checklist

Prospective buyers should focus their inspection on the mechanical and structural integrity of the swing keel. Over decades of use, the pivot bolt and the lifting cable mechanism are prone to wear and corrosion. A "thumping" sound while underway often indicates play in the keel trunk, which may require new bushings or shims.

Another area of concern is the deck-to-hull joint and the chainplates. Because the boat is often trailered and launched, the stress of repeated rigging and unrigging can lead to hairline fractures in the gelcoat around the shroud terminals. Additionally, buyers should inspect the rudder gudgeons on the transom for ovalization, a common issue in boats that have been raced heavily. Lastly, check the balsa core of the deck for soft spots, particularly around the mast step, as moisture ingress in these older French production boats can lead to delamination if the hardware wasn't re-bedded periodically.

Community & Resources

Owners of the Kelt 5.50 are largely represented by the "Association des Propriétaires de Kelt" (AS Kelt), a French-based organization that maintains technical documentation and organizes regattas for the various Kelt models. While much of their documentation is in French, it remains the most authoritative source for original sail plans and keel repair schematics.

The Verdict

The Kelt 5.50 is a masterclass in small-scale naval architecture, offering a spirited sailing experience and basic overnight accommodations in a package that can be towed by a standard family car.

Pros:

  • Ease of Transport: Light enough to be trailered and launched by two people without a crane.
  • Performance: Exceptional light-air performance and the ability to plane downwind.
  • Beachability: The swing-keel design allows for exploring shallow coves and drying out on sandy bottoms.
  • Value: Generally affordable on the used market with low maintenance costs.

Cons:

  • Limited Headroom: Interior is strictly for sitting or sleeping; no standing room.
  • Weight Sensitivity: Performance and stability are significantly affected by the placement of crew and gear.
  • Minimalist Amenities: Lack of a built-in head or galley makes long-term cruising a challenge.

Measurements

Construction & Hull

Construction Material
Hull Type
Monohull Sailboat
Keel Type
Lifting
Rudder
1x —
Ballast
331 lbs
Displacement
1190 lbs
Water Capacity
-
Fuel Capacity
-

Dimensions

Length Overall (LOA)
18.04 ft
Waterline Length (LWL)
15.75 ft
Beam
7.87 ft
Draft
3.61 ft
Max Headroom
-
Air Draft
-
Hover over a measurement
IJPE FS LOALWL

Rig & Sails

Rig Type
Fractional Sloop
P (Main Luff)
-
E (Main Foot)
-
I (Foretriangle Height)
-
J (Foretriangle Base)
-
Forestay Length (est)
-
Sail Area
182 sqft

Calculations

Sail Area / Displacement (SA/D) Ratio
25.93
Ballast / Displacement Ratio
27.82
Displacement / Length Ratio (D/L) Ratio
135.97
Comfort Ratio
7.16
Capsize Screening Formula
2.97
Hull Speed
5.32 kn