Flying Fifteen Information, Review, Specs

Make
Flying
Model
Fifteen
Builder
Various
Designer
Uffa Fox
Number Built
4000
Production Year(s)
1948 - ??

The Flying Fifteen, designed by the legendary Uffa Fox in 1947, represents one of the most enduring and successful examples of a high-performance, open-keelboat. Fox’s vision was to create a vessel that captured the exhilarating speed and planing characteristics of a dinghy while providing the stability and self-righting safety of a keelboat. Despite its 20-foot overall length, the boat derives its name from its 15-foot waterline, a design choice that minimized wetted surface area and allowed the hull to break free from its bow wave. While Copland Boats was one of several licensed builders, including Ovington Boats and Windebank, they contributed to the class’s growth during the mid-20th century, particularly within the British sailing scene. Today, the boat remains a staple of international competitive racing, governed by strict one-design rules that have allowed it to evolve technically without making older hulls obsolete.

Sailing Performance & Handling

The Flying Fifteen is celebrated for its unique "planing keelboat" identity. Unlike traditional heavy-displacement keelboats of its era, the Fifteen features a narrow, fine entry and a flat run aft, enabling it to reach planing speeds in relatively moderate breezes (typically starting around 12–15 knots). Its handling is described as technical and rewarding; because the boat lacks the immense leverage of a modern deep bulb keel, crew weight and sail trim are critical to maintaining the correct heel angle.

According to technical overviews from the International Flying Fifteen Class Association, the boat utilizes a 166 kg (366 lb) cast iron keel, which provides a high ballast ratio compared to its overall displacement. This setup makes it significantly more forgiving than a pure racing dinghy like a 505 or a 49er, yet it remains responsive enough to reward precise helming. Under spinnaker, the boat is notoriously fast off the wind, though it requires a skilled hand to prevent "rolling" in heavy following seas. The rig is highly adjustable, featuring a stepped mast that allows for significant rake and bend adjustments to depower the mainsail in high winds, ensuring the boat remains manageable for a two-person crew of varying sizes and ages.

The Flying Fifteen holds a distinguished place in maritime history due to its royal patronage. Prince Philip, the Duke of Edinburgh, was perhaps the most famous proponent of the class. His yacht, Coweslip, sail number 192, was a wedding present and was frequently campaigned at Cowes Week with Uffa Fox himself as crew. This royal connection significantly boosted the boat’s profile, cementing it as a prestige racing class in the UK and across the Commonwealth. The history of this specific vessel is preserved by the Royal Collection Trust, which notes its role in popularizing the class during the 1950s. Furthermore, the class's longevity is such that it has appeared in countless sailing memoirs and technical manuals as the definitive example of Uffa Fox’s "Flying" design philosophy.

Known Issues & Buyer’s Checklist

When inspecting a pre-owned Flying Fifteen, particularly those built by legacy manufacturers like Copland, buyers must distinguish between the "Classic," "Silver," and "Open" fleets. The class utilizes a tiered system based on sail numbers to ensure fair racing among different generations of hull shapes.

  • Buoyancy Integrity: Older GRP (Glass Reinforced Plastic) and wooden hulls are prone to leaks in the internal buoyancy tanks. Because the boat is an open design, the integrity of these tanks is the only thing preventing a total loss in the event of a knockdown. A pressure test of the tanks is highly recommended.
  • Keel Bolt Corrosion: In older cast iron keels, the bolts securing the keel to the hull can suffer from galvanic corrosion or "weeping" at the joint. If there is evidence of rust streaking or a "smile" at the leading edge of the keel-to-hull joint, the keel may need to be dropped and re-bedded.
  • Mast Step and Deck Compression: The rig tension required for competitive racing puts significant stress on the mast step. Inspect the area around the step for spiderweb cracking or deformation.
  • Weight Compliance: For those intended for serious racing, the boat must meet the class minimum weight. Older boats that have undergone multiple repairs may be "overweight," making them less competitive in light air.

Community & Resources

The class is supported by a robust global network, primarily the International Flying Fifteen Class Association (FFI), which manages the one-design rules and coordinates world championships. Regional branches, such as the Flying Fifteen Association of Great Britain, provide technical archives, tuning guides, and a pathway for newer sailors to enter the fleet. Many local clubs also maintain "Classic" fleets for older wooden boats, ensuring that the early Copland and Wyche & Coppock builds continue to have a dedicated racing venue.

The Verdict

The Flying Fifteen remains one of the most successful hybrid designs in sailing history, offering the thrills of a dinghy with the security of a keel. It is a purist’s boat that demands tactical brilliance and fine-tuned handling rather than brute strength.

Pros:

  • Exhilarating planing performance rarely found in other keelboats of its size.
  • Strict one-design rules protect the value and competitiveness of the boat.
  • Extremely active international racing community with high resale liquidity.
  • Manageable for a wide range of crew weights due to a highly adjustable rig.

Cons:

  • Lacks the creature comforts of a modern day-sailer; there is no interior or "dry" storage.
  • Low freeboard can result in a very wet ride in choppy conditions.
  • High-end competitive racing requires a significant investment in new sail inventories.

Measurements

Construction & Hull

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

Dimensions

Length Overall (LOA)
20 ft
Waterline Length (LWL)
15 ft
Beam
7 ft
Draft
2.5 ft
Max Headroom
-
Air Draft
-
Hover over a measurement
IJPE FS LOALWL

Rig & Sails

Rig Type
Fractional Sloop
P (Main Luff)
20.5 ft
E (Main Foot)
9.8 ft
I (Foretriangle Height)
15 ft
J (Foretriangle Base)
5.5 ft
Forestay Length (est)
15.98 ft
Sail Area
142 sqft

Calculations

Sail Area / Displacement (SA/D) Ratio
28.15
Ballast / Displacement Ratio
51.31
Displacement / Length Ratio (D/L) Ratio
95.9
Comfort Ratio
5.08
Capsize Screening Formula
3.12
Hull Speed
5.19 kn