Eagle 31 Information, Review, Specs

Eagle 31 Drawing
Make
Eagle
Model
31
Builder
Designer
Stan Huntingford
Number Built
Production Year(s)
1979 - 1982

Produced between 1979 and 1982 by C&L Marine Corp of Taiwan, the Eagle 31 (frequently referred to as the Sea Eagle 31) is a robust, semi-custom cruising sailboat designed by the esteemed Canadian naval architect Stan Huntingford. Entering the market during the height of Taiwan’s fiberglass yacht-building boom, the model was part of a broader effort by shipyards like C&L to transition from OEM labor into high-end proprietary brands. With a production run that saw only about 10 units imported into the United States, the Eagle 31 is a rare find today, distinguished by its overbuilt scantlings and offshore-capable design philosophy. It shares a builder lineage with the C&L Explorer 45 and the iconic Sea Ranger series of trawlers, reflecting a construction ethos that prioritized longevity and seaworthiness over light-air speed or assembly-line efficiency.

Sailing Performance & Handling

The Eagle 31 is fundamentally a medium-heavy displacement cruiser with a Displacement-to-Length (D/L) ratio of approximately 273. This technical profile translates to a boat that feels exceptionally stable and "planted" in a seaway, offering a predictable motion comfort that significantly outclasses lighter coastal cruisers of the same era. Its Sail Area-to-Displacement (SA/D) ratio of 14.5 confirms it is conservatively rigged, a trait noted in historical reviews within 48 North magazine, which suggests the boat is slightly under-powered in light airs but comes into its own when the breeze exceeds 15 knots.

Under sail, the boat’s stiffness is a byproduct of its 41% ballast ratio, allowing it to stand up well to a press of sail without excessive heeling. The hull features a fin keel and a skeg-hung rudder, a combination that provides a balanced helm and superior protection for the propeller compared to modern spade-rudder designs. While not a racing vessel, owners have reported surprisingly efficient passage times; one specific account in the October 1993 issue of Latitude 38 describes the model as a "performance cruiser" capable of comfortable offshore voyages, citing its ability to maintain high average speeds in following seas due to its long waterline of 27.33 feet.

Interior Comfort & Variations

Unlike many contemporary European boats of the late 1970s that utilized modular fiberglass liners, the Eagle 31 was built using "no-liner" construction. All bulkheads and furniture components were glassed directly to the hull, creating a monocoque structure that eliminates the creaks and structural flex common in liner-built boats. The interior is defined by a heavy use of Burmese teak, a hallmark of the C&L shipyard’s era, providing a warm, traditional aesthetic.

The layout is optimized for a cruising couple, typically featuring a forward stateroom with a Pullman berth offset to port—a design choice that allows for a larger, more accessible head and shower area just aft. The salon utilizes a U-shaped dinette to port and a linear galley to starboard, maximizing floor space. With a headroom of 6' 2", the cabin feels spacious for a 31-foot hull. Variations of this hull are few due to the limited production run, though sibling models from Stan Huntingford during the same period, such as the Trade Winds 34, often featured similar joinery and cabinetry details, emphasizing Huntingford's preference for functional offshore galleys and deep storage lockers.

The Eagle 31 maintains a quiet but prestigious reputation among long-distance sailors. Its most notable cultural footprint is associated with a sistership that successfully circumnavigated the globe single-handed, a feat frequently cited by brokers and owners as proof of the design's "blue water" credentials. The boat has been featured in technical reviews and classified sections of Latitude 38 for decades, often described as a rare offshore specialist that rarely remains on the used market for long.

Known Issues & Buyer’s Checklist

Prospective buyers should approach the Eagle 31 with the understanding that Taiwanese boats of this vintage often require specific structural inspections.

  • Deck Core and Teak Overlays: The decks were originally constructed with a balsa core and frequently featured teak overlays fastened with screws. Over decades, these screws can allow moisture to penetrate the balsa core. Many existing Eagle 31s have had their teak removed and the decks glassed over; buyers should prioritize these "dry deck" examples or budget for significant core repairs.
  • Airex Hull Integrity: While the Airex-cored hull is generally superior to solid laminate in terms of insulation and strength, a thorough survey is required to ensure no delamination has occurred, particularly around through-hull fittings where water could have entered the core.
  • Tankage Accessibility: The original fuel and water tanks were often made of stainless steel or iron and integrated into the bilge or beneath the furniture. Replacing these can be a labor-intensive "chainsaw" job if they have developed leaks due to localized corrosion.
  • Chainplate Inspection: Because the bulkheads are glassed in, the chainplates are robust but can be difficult to inspect where they pass through the deck. Look for evidence of weeping or "rust bleeding" on the interior teak, which indicates a need for re-bedding or replacement.

Community & Resources

Owners of the Eagle 31 and its C&L siblings often find technical support through the broader Taiwanese Boat Owners associations or through communities dedicated to Stan Huntingford’s designs. While there is no dedicated factory support for C&L Marine today, the builder's use of standard marine hardware and high-quality wood makes them highly restorable for enthusiasts of classic "plastic classics."

The Verdict

The Eagle 31 is an overbuilt, traditional cruiser that punches well above its weight class in terms of seaworthiness and interior luxury. It is an ideal vessel for a sailor looking to transition from coastal hopping to serious offshore voyaging on a budget.

Pros:

  • Exceptional structural rigidity due to "no-liner" construction and glassed-in bulkheads.
  • High ballast ratio and skeg-hung rudder provide safety and stability in heavy weather.
  • Elegant, high-quality teak joinery rarely seen in modern boats of this size.
  • Proven offshore pedigree, including successful circumnavigations.

Cons:

  • Vulnerable to deck core rot if original teak overlays have not been addressed.
  • Conservative sail plan leads to sluggish performance in light winds.
  • Extremely limited production makes finding parts and specific model knowledge difficult.
  • Small original fuel and water capacities may require modification for long-range cruising.

Measurements

Construction & Hull

Hull Material
Fiberglass (PVC Foam Core)
Deck Material
Fiberglass (Balsa Core)
Hull Type
Monohull Sailboat
Keel Type
Fin
Rudder
1x Skeg-Hung
Ballast
5125 lbs
Displacement
12500 lbs
Water Capacity
65 gal
Fuel Capacity
35 gal

Dimensions

Length Overall (LOA)
31 ft
Waterline Length (LWL)
27.33 ft
Beam
10.33 ft
Draft
4.75 ft
Max Headroom
-
Air Draft
-
Hover over a measurement
IJPE FS LOALWL

Rig & Sails

Rig Type
Masthead Sloop
P (Main Luff)
34 ft
E (Main Foot)
13 ft
I (Foretriangle Height)
39.5 ft
J (Foretriangle Base)
13.5 ft
Forestay Length (est)
41.74 ft
Sail Area
488 sqft

Calculations

Sail Area / Displacement (SA/D) Ratio
14.49
Ballast / Displacement Ratio
41
Displacement / Length Ratio (D/L) Ratio
273.37
Comfort Ratio
30.3
Capsize Screening Formula
1.78
Hull Speed
7.01 kn