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Sailboat Specifications

Seawind Allied

Masthead Ketch · Long Keel W/Trans. Hung Rudder

Designed by Thomas Gillmer · Built by Allied Boat Co. (Usa) · First built 1962

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LOA 30.50 ft  ·  Beam 9.25 ft  ·  Displacement 12,000.00 lb  ·  Sail Area 502.00 ft²  ·  Masthead Ketch  ·  Long Keel W/Trans. Hung Rudder
About the Seawind Allied Sailboat

Designed by renowned naval architect Thomas Gillmer and built by Allied Boat Company from 1962 to 1982, this masthead ketch represents classic American cruising boat design from sailing's golden era. With 161 hulls produced over two decades, the Seawind Allied established itself as a respected passage-maker among serious cruising sailors. The boat's traditional long keel configuration with transom-hung rudder provides exceptional directional stability and tracking, making it well-suited for offshore passages and extended coastal cruising. At 30.50 feet overall with a 24-foot waterline, she offers substantial accommodations while maintaining manageable size for couples or small families. The ketch rig configuration provides versatile sail handling options, particularly valuable during long passages or heavy weather sailing. Built with solid fiberglass construction, these boats earned a reputation for robust build quality and seaworthiness. The generous displacement of 12,000 pounds and substantial ballast ratio contribute to a stable, comfortable motion at sea, though performance sailors may find her on the slower side. The impressive comfort ratio of 36.91 reflects Gillmer's focus on creating a true ocean-going cruiser rather than a coastal day-sailer. For those seeking a traditional, well-built cruising boat with proven offshore capabilities, the Seawind Allied remains a compelling choice in today's used boat market.

Dimensions & Specifications
LOA (Length Overall) 30.50 ft / 9.30 m
LWL (Waterline Length) 24.00 ft / 7.32 m
Beam 9.25 ft / 2.82 m
Max Draft 4.20 ft / 1.28 m
Displacement 12,000.00 lb / 5,443 kg
Ballast 4,200.00 lb / 1,905 kg
Sail Area (Reported) 502.00 ft² / 46.64 m²
Design & Construction
Hull Type Long keel w/trans. hung rudder
Rigging Type Masthead Ketch
Construction FG
Designer Thomas Gillmer
Builder Allied Boat Co. (USA)
First Built 1962
Last Built 1982
Number Built 161
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Engine & Accommodations
Engine Make Palmer /Gray Marine
Engine Model M-60
Engine Type Gas
Fuel Capacity 12 gals / 45 L
Water Capacity 30 gals / 114 L
Frequently Asked Questions

What is the Seawind Allied's sail area to displacement ratio?

The Seawind Allied has a Sail Area to Displacement ratio (SA/D) of 15.38. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Seawind Allied's comfort ratio?

The Seawind Allied has a Ted Brewer Comfort Ratio of 36.91. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Seawind Allied safe for offshore sailing?

The Seawind Allied has a Capsize Screening Formula value of 1.62. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Seawind Allied?

The theoretical hull speed of the Seawind Allied is 6.56 kn knots, calculated from its waterline length.

How much does a Seawind Allied weigh?

The Seawind Allied has a displacement of 12,000.00 lb and a length overall (LOA) of 30.50 ft.

Who designed the Seawind Allied?

The Seawind Allied was designed by Thomas Gillmer, first built in 1962.