Microtonner 19 Information, Review, Specs

Sailing Performance & Handling

The Microtonner 19 is defined by the technical constraints of the Micro Class, which dictated a maximum length of 5.50 meters and a beam of roughly 2.45 meters. This wide beam relative to its length provides the boat with exceptional initial stability and a large cockpit for a boat of its size. According to design specifications from Groupe Finot, the hull was engineered with a flat aft section to encourage early planing, a trait that makes the boat particularly exhilarating when sailing off-the-wind in a breeze.

Under sail, the boat is highly responsive, often described by owners as "dinghy-like" in its sensitivity to helm and trim. Because it was designed to fit the "Cruiser" sub-category of the Micro Class, it carries a fractional rig that allows for fine-tuning the mast bend and mainsail shape. With a light displacement, the boat has a high sail-area-to-displacement ratio, ensuring it remains moving even in light air. However, this same lightness means it requires active weight management; in heavy air, the crew must be diligent about hiking to keep the boat on its lines. The retractable centerboard or swing keel allows for shallow-water exploration and easy trailering, though it does sacrifice some of the ultimate righting moment found in fixed-keel mini-tonners.

Interior Comfort & Variations

Despite its diminutive 19-foot length, the Microtonner 19 features a surprisingly functional cabin, though it is best described as "sitting headroom only." The interior layout is typically Spartan, designed more for weight savings than luxury. It generally offers four berths: a double V-berth forward and two narrow quarter-berths extending aft under the cockpit seats. The absence of a permanent galley or enclosed head is standard for this class, though most owners utilize a portable stove and a chemical toilet for overnight trips.

Mariner Construções Náuticas utilized fiberglass moldings for the interior liners, which made the boat easy to clean and helped stiffen the hull. Sibling variants of this design exist within the broader Micro Class family; while the Mariner version focused on a "Cruiser" layout with more fiberglass interior finish, other European builders produced "Proto" or "Racer" versions of the same Finot lines that featured carbon fiber components and stripped-out interiors. In Brazil, the Mariner 19 (a separate O’Day design) is sometimes confused with the Microtonner 19, but the Microtonner remains distinct due to its wider beam and more aggressive racing profile.

Popular Mentions & Media

The Microtonner 19 owes much of its fame to the International Micro Cuppers Class Association (IMCCA), which has governed the competitive life of these boats since the late 1970s. The class gained global visibility through the Micro Cup, an international regatta that saw these boats being towed across continents to compete. In Brazil, the Microtonner 19 became a cultural icon of the "Yacht Club Guaíba" and other Porto Alegre sailing hubs, where it was celebrated for democratizing performance sailing.

Known Issues & Buyer’s Checklist

When inspecting a Mariner-built Microtonner 19, prospective buyers should focus on the following high-signal areas:

1. Centerboard Pivot and Trunk: The lifting mechanism and the pivot bolt are known wear points. Check for "clunking" sounds while sailing, which indicate a worn pivot, and inspect the trunk for stress cracks that could lead to significant leaks.
2. Deck Core Integrity: Like many boats from the 1980s, these vessels often used balsa or plywood coring. Use a plastic hammer to "tap-test" the deck around the chainplates and mast step to check for delamination or soft spots caused by water ingress.
3. Rudder Pintles and Gudgeons: Given the high loads generated by the wide beam and planing speeds, the transom-mounted rudder hardware often develops play. Ensure the pintles are secure and the transom is not flexing under load.
4. Rigging Terminals: Many Microtonners were raced hard. Inspect the wire standing rigging for "fishhooks" or corrosion, particularly at the swage fittings, as these boats carry a high-tension fractional rig.

Community & Resources

The primary hub for technical data and class rules is the International Micro Cuppers Class Association (IMCCA), which maintains the heritage and racing standards for all 5.50-meter Micro designs. In Brazil, technical support and owner discussions are often found through the regional sailing federations in Rio Grande do Sul, where the Mariner shipyard was most active.

The Verdict

The Microtonner 19 is a "pocket rocket" that offers a bridge between high-performance racing and weekend camping. It is an ideal choice for the sailor who values speed and transportability over domestic luxury.

Pros:

• Exceptional Speed: Capable of planing downwind and very competitive in PHRF or class racing.
• Easy Logistics: Trailerable by a standard vehicle and easy to launch from a ramp.
• Strong Pedigree: Designed by Jean-Marie Finot, ensuring excellent hull dynamics and safety.

Cons:

• Cramped Quarters: Interior is restricted to sitting headroom and basic overnighting.
• High Activity Level: Requires active crew work; not a "set and forget" cruiser.
• Age Concerns: Most units require updates to rigging and potential fiberglass core repairs.