Design Brief & Intent
The Jet was designed specifically for intermediate to advanced double-handed sailors who wanted a fast, planing dinghy without the fragile nature of some ultra-lightweight contemporary racers. With an overall length of 15.58 feet and a beam of 5.58 feet, Maury gave the Jet a slightly wider, more stable hull form than the pencil-thin Olympic racers of the day.
The interior layout is entirely open, optimized for high-performance crew mechanics. Large, sealed buoyancy tanks run down both sides of the cockpit, providing structural stiffness and flotation while also acting as wide, comfortable hiking benches. Construction consists of solid, hand-laid fiberglass, which was overbuilt by modern standards but provided the rigidity needed to handle high rigging loads and frequent beach landings. True to its era, vintage models incorporated varnished marine plywood for the transom, rudder head, and centerboard, though later production runs shifted entirely to aluminum and composite materials to decrease maintenance demands.
Sailing Performance & Handling
The sailing dynamics of the Jet are defined by its exceptionally light 265-pound displacement and its generous 150-square-foot sail plan. These physical characteristics yield an extraordinary sail area-to-displacement ratio of 58.17, indicating a boat that behaves like a purebred racer. The Jet planes with ease on a reach or run in anything over a moderate breeze, riding high on its flat aft sections.
Conversely, the boat’s low comfort ratio of 2.72 and high capsize ratio of 3.48 tell the story of an incredibly lively and sensitive hull. This is not a passive family day-sailer. The helm is highly communicative, transmitting every change in wind pressure and water flow directly to the helmsman’s hand. However, the powerful, tall mainsail means the Jet can feel like an unsettled colt to inexperienced sailors. Active weight management, precise mainsheet trim, and coordinated teamwork between the skipper and crew are essential to keeping the boat flat. It performs exceptionally well upwind, but in heavy air, a heavier crew pairing is advantageous to keep the powerful rig under control without constantly washing speed in excessive heel.
Known Issues & Triage
For those looking to purchase or restore a vintage Jet, there are several critical structural areas that require thorough inspection:
- Buoyancy Tank Integrity and Bow Hatch Leakage: The most critical safety hazard on the Jet involves the forward storage locker hatch. Originally designed to be held shut by a simple bungee cord, this hatch is notorious for leaking. If the boat capsizes with the spinnaker up, water can rapidly flood this forward chamber, rendering the boat impossible to right and leading to severe swamping. Experienced owners often permanently seal this factory hatch with structural polyurethane adhesive or replace it with a modern, screw-in, O-ring-sealed inspection port. The side buoyancy tanks must also be tested for leaks around the drain plugs.
- Soft Hulls (Coque Molle): Decades of hard sailing, flexing under high rigging loads, or improper trailer storage can cause the single-skin fiberglass hull bottom to go soft, a condition known among French owners as coque molle. Press firmly along the bottom of the hull near the centerboard trunk; any noticeable oil-canning or deflection indicates fatigue in the laminate that requires reinforcing with fiberglass cloth and epoxy on the interior floor.
- Centerboard Trunk and Mast Step Stress: Inspect the fiberglass surrounding the base of the centerboard trunk. The lateral forces generated during high-speed planing often cause stress cracking or crazing at this joint, which can lead to slow, persistent leaks. Similarly, the mast step is prone to compression and cracking. If the deck molding or floor beneath the mast step shows any sagging, the underlying structure must be reinforced.
Modernization & Upgrades
Modernizing a vintage Jet centers on safety, ergonomics, and simplifying control lines. The original vintage wooden rudders and centerboards, while beautiful, are heavy and prone to delamination. Upgrading to a modern composite or high-grade marine plywood rudder blade housed in a modern aluminum rudder head significantly improves steering responsiveness and reduces weight aloft on the transom.
The deck layout benefits greatly from modern hardware retrofits. Replacing original, undersized jam cleats with high-load cam cleats makes adjusting the jib, cunningham, and vang significantly easier under load. Installing a modern, continuous control line system allows both skipper and crew to adjust trim from the hiking straps without lunging into the center of the cockpit. Finally, retrofitting modern, venturi-style self-bailers in the cockpit floor ensures that any water shipped during spirited sailing is quickly evacuated once the boat is up to planing speed.
The Verdict
The Lanaverre Jet remains a thrilling, vintage alternative to mainstream double-handed racers. It offers high-performance, athletic sailing and instantaneous planing at a fraction of the cost of newer designs. While it demands a watchful eye regarding structural maintenance and requires active, skilled handwork on the water, its historic pedigree and robust hull make it a rewarding project for sailors who love classic French dinghies.
Pros
- Blistering performance with instant planing capability in moderate winds
- Designed by Christian Maury, offering classic lines and excellent sailing ergonomics
- Slightly more robust construction and a more forgiving hull shape than highly fragile Olympic racers of the same era
- Wide side tanks make hiking comfortable and provide excellent natural buoyancy
- The original forward compartment hatch is highly prone to leaking and must be sealed to prevent swamping
- Lively and highly sensitive helm that is unforgiving to novice errors in heavy air
- Aged single-skin fiberglass hulls are susceptible to structural flexing and soft spots
- Replacement parts and class-specific hardware can be difficult to source outside of Western Europe
