UFO 6 Sailboat Review, Specs, and Listings

Sierp de Vries·1980 – 1995·~183 hulls·Sierp de Vries
Approximate drawing

Hover a measurement to read its value

Hull Type
Monohull · fin
Rig
Fractional Sloop
LOA
19.68' · 6 m
Disp.
1,102 lbs · 500 kg
First year
1980

Designed in the early 1980s by Dutch naval architect Sierp de Vries, the UFO 6m (frequently referred to as the UFO 6) was conceived as a highperformance, ultralight pocket dayboat. Launched during an era when the trailersailer market was heavily populated by sluggish, highvolume caravans, the UFO 6m represented a radical departure toward pure sailing sensation. De Vries prioritized a slippery hull form, a lowprofile cabin trunk, and a powerful fractional rig to appeal to club racers and performanceoriented day sailors. While competitors of the time focused on squeezing standing headroom and galley cabinetry into twenty feet of fiberglass, the UFO 6m was built to plane. The interior reflects this singular mission: it is an uncompromisingly minimalist space, offering basic shelter and a couple of simple berths, with no heavy joinery or unnecessary amenities to compromise the boat's featherweight design.

Measurements

Dimensions 01

Length Overall
19.68 ft
Length on deck
Waterline Length
17.06 ft
Beam
6.56 ft
Draft
2.95 ft
Maximum Headroom
Air Draft

Construction & hull 02

Construction
Fiberglass
Hull Type
Monohull
Keel Type
Fin
Rudder
1× Transom-Hung
Ballast
353 lbs (Lead)
Displacement
1,102 lbs
Water Capacity
Fuel Capacity

Rig & sails 03

Rigging Type
Fractional Sloop
Mainsail luff
Mainsail foot
Foretriangle height
Foretriangle base
Forestay Length (estimated)
Sail Area
177 sqft

Calculations 04

Sail Area to Displacement Ratio
26.54
Ballast to Displacement Ratio
32.03
Displacement to Length Ratio
99.08
Comfort Ratio
7.78
Capsize Screening Ratio
2.54
Hull Speed
5.53 kn

Design Brief & Intent

The core philosophy of the UFO 6m was to deliver maximum sailing thrills within a highly manageable, trailerable package. Built in fiberglass between 1980 and 1995, with 183 hulls completed, the design carved out a dedicated niche in the European sportsboat and day-sailing scenes. Unlike many of its contemporaries that featured heavy cast-iron swing keels or bulbous bilges, the UFO 6m was engineered with a clean, low-drag fin keel and a transom-hung rudder. This configuration maximized hydrodynamic efficiency while keeping the overall displacement incredibly low.

The boat’s structural layout speaks to its high-performance intent. GRP construction keeps the hull light yet rigid. Inside, the cabin layout is Spartan. There is no standing headroom; instead, the space is optimized for sitting and stowing sails, gear, and safety equipment. The lack of heavy bulkheads and wooden cabinetry ensures that the center of gravity remains low and the boat remains light enough to be easily ramp-launched and towed behind a standard family vehicle.

Sailing Performance & Handling

On the water, the technical ratios of the UFO 6m translate into an exceptionally lively and responsive experience at the helm. Boasting a displacement-to-length ratio of just 99.08, the vessel is firmly in the ultralight category. This minimal mass, paired with a generous sail-area-to-displacement ratio of 26.54, allows the boat to accelerate rapidly in the lightest of breezes. On a reach or downwind under a spinnaker, the hull easily breaks free of its bow wave, delivering a sensation more akin to a high-performance racing dinghy than a traditional keelboat.

However, this level of performance demands active participation from the crew. With a ballast-to-displacement ratio of 32.03%, the boat possesses decent initial stiffness, but its low displacement means crew weight is a crucial component of the righting moment. This dynamic nature is further emphasized by a low comfort ratio of 7.78 and a capsize screening formula of 2.54. In a seaway, the UFO 6m is highly active, translating wave action directly to the crew and requiring diligent mainsheet trim to keep the boat flat and fast in gusty conditions. For experienced sailors, this responsiveness is a joy, offering instant feedback and precise control, though beginners may find its rapid acceleration and heel angles intimidating.

Market Standing & Economics

With production ending in 1995 after 183 units, the UFO 6m remains a relatively rare sight on the brokerage market, primarily concentrated in Northern Europe and the Netherlands. Because of its specialized nature, it does not command the mass-market premium of mainstream cruising trailer-sailers. Instead, it trades at an accessible value point, making it a highly economical entry point for sailors seeking pure performance.

The economics of owning a UFO 6m are highly favorable. Its modest size and light displacement mean that maintenance costs, slip fees, and winter storage can be easily bypassed by keeping the boat on a trailer in a driveway. Refit costs are similarly scaled down; replacing a suit of sails or upgrading the running rigging on a twenty-footer is a fraction of the cost of doing so on a larger yacht. For an owner willing to put in a bit of sweat equity, restoring a classic UFO 6m to racing form is a highly rewarding, low-risk financial endeavor.

Key Areas for Inspection & Maintenance

Prospective buyers should focus their pre-purchase evaluations on a few critical areas typical of lightweight GRP builds from the 1980s. The deck and cabin house should be thoroughly tested for moisture intrusion. Many builders of this era utilized balsa or plywood coring to save weight, and compromised deck hardware seals can lead to core rot over time. Pay close attention to the area around the chainplates, mast step, and deck cleats.

The keel joint is another area of interest. Given the high-performance nature of the fin keel and the likelihood that these boats have been raced hard or sailed in shallow waters, the hull-to-keel joint must be inspected for stress fractures or signs of hard groundings. Additionally, check the transom and the pintles of the transom-hung rudder. Because the rudder is highly loaded when the boat is sailing at speed, any play in the gudgeons or stress cracking in the surrounding laminate should be addressed immediately. Finally, ensure that any outboard engine bracket mounted on the transom is backed by adequate reinforcement plates on the inside of the hull.

The Verdict

The UFO 6m is a brilliant testament to the early sportboat movement, offering an unfiltered, high-performance sailing experience that remains incredibly compelling today. While it lacks the cruising comforts and heavy-weather security of a traditional pocket cruiser, it more than makes up for these deficits with its sheer speed, responsive handling, and ease of trailering. For the club racer or day sailor who prioritizes the thrill of the wind and wave over cabin amenities, this Dutch classic is a standout choice.

Pros:

  • Exceptional light-air performance and planning potential downwind.
  • Extremely lightweight design makes trailering, launching, and retrieving highly manageable.
  • Low-cost maintenance and affordable sail replacement compared to larger sportsboats.
  • Highly responsive helm provides an engaging, dinghy-like sailing experience.

Cons:

  • Minimalist interior with no standing headroom or standard cruising amenities.
  • Low comfort ratio results in a highly active and wet ride in choppy conditions.
  • Low righting moment compared to heavier keelboats requires active crew hiking and sheet management.
  • Limited availability on the global brokerage market outside of Northern Europe.

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