Int Dragon Information, Review, Specs

Int Dragon Drawing
Make
Int
Model
Dragon
Builder
Designer
Johann Anker
Number Built
Production Year(s)
1928 - ??

Designed in 1929 by Norwegian yacht designer Johan Anker, the International Dragon is the pre-eminent one-design keelboat in the world. Originally conceived as a cruiser-racer for young sailors, the design quickly evolved into a pure racing machine, characterized by its long overhangs, elegant meter-boat lines, and a narrow hull that excels in a wide range of conditions. The boat’s historical significance was cemented when it served as the Olympic three-person keelboat class from 1948 to 1972. While many former Olympic classes faded after de-selection, the Dragon flourished through the formation of the International Dragon Association (IDA), which managed a careful transition from traditional carvel-planked wood to fiberglass (GRP) construction in the 1970s.

Since 1988, Petticrows Ltd has been the dominant force in Dragon production, initially building their reputation with hulls optimized by designer Ian Howlett. The "Petticrows era" revolutionized the class by introducing advanced research and development, including tank tests and hull shape optimization, which led to the legendary Petticrow 2000 model. Today, the builder operates out of Cascais, Portugal, producing the cutting-edge v6.1 series. This modern iteration reflects decades of refinement, utilizing digital design to remodel internal structures for maximum stiffness and ergonomic efficiency.

Sailing Performance & Handling

The Dragon is often described as a "thoroughbred" that rewards tactical precision over brute strength. With a displacement of approximately 1,700 kg—of which over 1,000 kg is concentrated in the keel—the boat is incredibly stable but demands a high degree of technical skill to sail at an elite level. The Petticrows v6 and v6.1 models are noted for their longitudinal stiffness, achieved through resin infusion and bonded bulkheads, which prevents the hull from flexing under the high loads required by the running backstays.

Sailing a Dragon involves managing one of the most flexible and adjustable rigs in racing. Sailors must balance forestay tension, which can exceed 1.2 tonnes, with mast bend controlled via runners and a deck-level mast ram. According to Yachting World, the Dragon remains one of the few top-level classes where the mastery of windage and subtle sail trim nuances still predominates over crew weight. Petticrows’ current "Evolution" mast further enhances this by utilizing a front-weld taper for smooth bending characteristics, allowing the boat to remain competitive even as conditions shift on the course.

The Dragon’s cultural footprint is uniquely tied to European royalty and the pinnacle of professional sailing. Prince Philip famously raced Bluebottle, a Dragon given to him and Queen Elizabeth II as a wedding gift, which is now a museum piece at the Royal Yacht Britannia. In competitive circles, the class attracts a "who's who" of sailing legends; America’s Cup veterans like Russell Coutts and Dennis Conner, and Olympic medalists such as Lawrie Smith, are regular fixtures at the Dragon Gold Cup, a prestigious annual event that is unique for its "no-discard" rule across six races.

Known Issues & Buyer’s Checklist

When inspecting a used International Dragon, particularly those built by Petticrows, focus on the following high-signal technical areas:

  • Mast Gate and Step Integrity: The rig’s immense runner tension places significant stress on the mast collar and the keel-stepped mast base. Buyers should inspect the mast gate area for stress cracking or "shattered" resin, as the mast moves through approximately 8 degrees from upwind to downwind settings.
  • Hull Stiffness: Early fiberglass boats and those using "Spheretex" (a stiffening material once popular but later banned for new builds) can lose their competitive edge if the laminate softens. Check the fore-and-aft rigidity, as longitudinal stiffness is critical for maintaining waterline length and speed in a chop.
  • Keel/Hull Join: While Petticrows uses modern bonding techniques, older boats or those with encapsulated keels should be checked for moisture ingress or cracking at the joint. Petticrows notes that their newer v6.1 rudders are lighter and rudders in general are common sites for osmotic blistering if not dry-sailed.
  • Teak Deck Condition: Many Dragons feature "Teak on Glass" or hand-crafted wooden decks. Verify that the teak veneer hasn't worn thin or delaminated, as these features are expensive to restore and vital for the boat's aesthetic and resale value.

Community & Resources

The Dragon community is supported by a robust network of national and international organizations. The International Dragon Association (IDA) oversees the class rules and major championships, ensuring that boats built decades ago can still compete on level terms with modern GRP models. Regional groups, such as the British Dragon Association and the North American Dragon Association, provide localized regatta schedules and technical support. Owners of Petticrows-built boats also benefit from the builder's technical setup guides, which offer specific measurements for mast rake, jumper tension, and shroud calibration.

The Verdict

The International Dragon is a timeless marriage of classic elegance and elite-level competition, remaining as relevant today as it was during its Olympic tenure.

Pros:

  • Elite Competition: Access to some of the most competitive and tactical one-design racing in the world.
  • Exceptional Resale: Petticrows-built Dragons, particularly the v6 and v6.1 models, hold their value remarkably well.
  • Timeless Beauty: Its meter-boat lines ensure it remains one of the most aesthetically pleasing vessels in any marina.

Cons:

  • Technical Complexity: The high-tension rig and sensitive tuning require a steep learning curve for new crews.
  • High Entry Cost: New Petticrows models represent a significant investment compared to other 29-foot daysailers.
  • Narrow Purpose: As a pure racing keelboat, it lacks any interior amenities or cruising capability.

Measurements

Construction & Hull

Construction Material
Fiberglass/Wood Composite
Hull Type
Monohull Sailboat
Keel Type
Fin
Rudder
1x —
Ballast
2200 lbs
Displacement
3740 lbs
Water Capacity
-
Fuel Capacity
-

Dimensions

Length Overall (LOA)
29.17 ft
Waterline Length (LWL)
19 ft
Beam
6.42 ft
Draft
3.92 ft
Max Headroom
-
Air Draft
-
Hover over a measurement
IJPE FS LOALWL

Rig & Sails

Rig Type
Fractional Sloop
P (Main Luff)
33 ft
E (Main Foot)
12 ft
I (Foretriangle Height)
26.3 ft
J (Foretriangle Base)
6.7 ft
Forestay Length (est)
27.14 ft
Sail Area
286 sqft

Calculations

Sail Area / Displacement (SA/D) Ratio
18.99
Ballast / Displacement Ratio
58.82
Displacement / Length Ratio (D/L) Ratio
243.42
Comfort Ratio
22
Capsize Screening Formula
1.65
Hull Speed
5.84 kn