The Allied Seawind, often referred to as the Seawind 30 to distinguish it from its larger successor, occupies a hallowed position in the annals of American yachting. Designed by the esteemed naval architect Thomas Gillmer, the Seawind was the first fiberglass sailboat to successfully circumnavigate the globe—a feat accomplished by Alan Eddy aboard Apogee between 1964 and 1967. This voyage effectively silenced early critics of "glass" construction, proving that reinforced plastic could withstand the rigors of the open ocean. Built in Catskill, New York, the Seawind was characterized by its rugged, overbuilt hull and a traditional aesthetic that appealed to conservative offshore sailors. While it was available as a sloop, the vast majority were delivered as ketches, a rarity for a boat of only 30 feet, providing a versatile sail plan that defined the model’s identity as a miniature blue-water voyager.
Allied Seawind Information, Review, Specs

- Make
- Allied
- Model
- Seawind
- Builder
- Allied Boat Company Inc.
- Designer
- Thomas Gillmer
- Number Built
- 161
- Production Year(s)
- 1962 - 1982
Sailing Performance & Handling
On the water, the Seawind is the quintessential "heavy-weather" boat. With a displacement of roughly 12,080 pounds and a ballast-to-displacement ratio approaching 35%, it possesses the physical mass required to punch through a heavy chop without losing momentum. The hull features a long full keel with a protected propeller aperture, which provides exceptional directional stability and makes the boat remarkably easy to balance under sail. Owners frequently report that the Seawind "steers itself" once the sheets are trimmed, a trait highly prized by single-handers.
The ketch rig, while adding complexity in terms of standing rigging, offers a "mule" configuration (jib and mizzen) that allows the boat to remain upright and manageable in 30-knot gusts while others are struggling to reef a mainsail. However, the trade-off for this sea-kindliness is felt in light air. With a Sail Area-to-Displacement (SA/Disp) ratio of approximately 14.5, the Seawind can feel sluggish in breezes under 10 knots. It is not a boat that "points" particularly high into the wind compared to modern fin-keel designs, but it compensates with a gentle motion at sea that reduces crew fatigue. According to technical reflections often shared by the Allied Boat Company legacy resources, the hull’s wineglass sections and substantial sheer contribute to a dry ride even when the bow is buried in a swell.
Interior Comfort & Variations
The interior of the Seawind reflects the design priorities of the early 1960s: functional, cozy, and optimized for use at sea rather than at the dock. With a beam of 9 feet 3 inches, it is narrow by modern standards, which translates to a secure environment where one is never more than a short reach away from a sturdy handhold. The traditional layout features a V-berth forward, followed by a head and hanging locker that separates the sleeping quarters from the main salon. The salon typically employs two longitudinal settees with a removable or folding table, and the galley is split across the companionway, placing the sink and stove in the area of least motion.
Variations of the Seawind evolved over its production run. While the hull remained consistent, Allied eventually introduced the Seawind II in the mid-1970s, which was an entirely different, larger hull (32 feet) also designed by Gillmer to address the original model's lack of headroom and beam. For those seeking the original 30-foot hull, the choice is largely between the sloop and ketch rigs. The ketch remains the more sought-after variant for its classic "little ship" appeal, though the sloop offers slightly better windward performance and a less cluttered cockpit.
Popular Mentions & Media
The Allied Seawind’s reputation is inextricably linked to Alan Eddy’s Apogee. His three-year journey is documented in various historical sailing archives and was a pivotal moment for the Allied Boat Company, serving as the cornerstone of their marketing for decades. The boat’s durability was further validated when it became a favorite of the legendary sailor and author Ferenc Maté, who praised Allied's construction techniques in his seminal books on yacht design. The model remains a staple in "Best Used Boat" lists within Cruising World and Good Old Boat magazine, often cited as the entry-level gold standard for aspiring circumnavigators on a budget.
Known Issues & Buyer’s Checklist
Prospective buyers of a vintage Seawind should focus their inspections on the specific structural characteristics of 1960s fiberglass construction.
- Chainplates: The original chainplates were often glassed into the hull structure or bolted through the deck in ways that can lead to moisture intrusion. Over decades, this can cause crevice corrosion of the stainless steel or rot in the localized deck core.
- Deck Core: Allied used a mix of materials for coring, often balsa or plywood. Buyers should use a phenolic hammer to sound the decks for delamination, particularly around stanchion bases and the ketch’s mizzen mast step.
- The "Allied Smile": Like many full-keel boats of this era with internal lead ballast, a hairline crack can develop at the forward leading edge of the keel-to-hull joint. While often cosmetic, it requires sealing to prevent water from reaching the laminate.
- Engine Access: Many Seawinds were originally powered by the gasoline Atomic 4 engine. While many have been repowered with diesels (such as Westerbeke or Yanmar), the engine room is notoriously tight, making routine maintenance like impeller changes a challenge for larger owners.
- Rudder Bushings: The bronze gudgeons and pintles on the barn-door rudder should be checked for play, as decades of use can wear the bushings, leading to a vibrating or "clunky" feel at the helm.
Community & Resources
The Seawind enjoys one of the most dedicated owner bases in the classic plastic community. The Allied Seawind Owners Association (ASOA) remains the primary repository for technical drawings, original brochures, and DIY maintenance logs. Because the company’s history is so intertwined with the Catskill region, there is also a significant amount of localized knowledge preserved by shipyards along the Hudson River that originally serviced these vessels.
The Verdict
The Allied Seawind is a "sailor’s sailboat" that prioritizes structural integrity and offshore safety over interior volume and light-air speed. It remains an excellent choice for a couple or solo sailor looking to cross oceans in a proven, historically significant hull.
Pros:
- Exceptional Tracking: The full keel allows for effortless long-distance steering.
- Bulletproof Construction: Solid fiberglass layup that exceeds modern scantlings.
- Historical Pedigree: Pride of ownership comes from its "first circumnavigator" status.
- Heavy Weather Stability: A predictable, comfortable motion in high seas.
Cons:
- Light Air Performance: Requires the engine or a large cruising chute in breezes under 10 knots.
- Cramped Quarters: Narrow beam and limited headroom may feel claustrophobic for long-term living.
- Difficult Maneuvering: Like most full-keel boats, it is challenging to back up in a straight line under power.
Measurements
Construction & Hull
- Construction Material
- Fiberglass
- Hull Type
- Monohull Sailboat
- Keel Type
- Full
- Rudder
- 1x Transom-Hung
- Ballast
- 4200 lbs
- Displacement
- 12000 lbs
- Water Capacity
- 30 gal
- Fuel Capacity
- 12 gal
Dimensions
- Length Overall (LOA)
- 30.5 ft
- Waterline Length (LWL)
- 24 ft
- Beam
- 9.25 ft
- Draft
- 4.2 ft
- Max Headroom
- -
- Air Draft
- 44 ft
Rig & Sails
- Rig Type
- Ketch
- P (Main Luff)
- 31.83 ft
- E (Main Foot)
- 13 ft
- I (Foretriangle Height)
- 35.58 ft
- J (Foretriangle Base)
- 12.25 ft
- Forestay Length (est)
- 37.63 ft
- Sail Area
- 502 sqft
Calculations
- Sail Area / Displacement (SA/D) Ratio
- 15.32
- Ballast / Displacement Ratio
- 35
- Displacement / Length Ratio (D/L) Ratio
- 387.52
- Comfort Ratio
- 36.91
- Capsize Screening Formula
- 1.62
- Hull Speed
- 6.56 kn