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Sailboat Specifications

Seadog 30

Masthead Ketch · Triple Keel

Designed by Reg Freeman · Built by Glascade Grp Ltd./Reg Freeman Yachts Ltd. (Uk) · First built 1966

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LOA 30.00 ft  ·  Beam 9.50 ft  ·  Displacement 12,765.00 lb  ·  Sail Area 399.00 ft²  ·  Masthead Ketch  ·  Triple Keel
About the Seadog 30 Sailboat

Designed by Reg Freeman and built in the UK from 1966 to 1974, this distinctive 30-footer represents British yacht design philosophy of the era with its practical approach to cruising. The triple keel configuration makes the Seadog 30 particularly appealing to sailors who frequent shallow waters or prefer the convenience of drying out upright in tidal harbors—a significant advantage for coastal exploration around the British Isles and similar environments. The masthead ketch rig provides excellent sail handling flexibility, allowing crew to easily balance the boat in varying conditions while reducing individual sail sizes for more manageable handling. With a displacement of 12,765 pounds and substantial ballast ratio, this fiberglass cruiser offers the stability and sea-keeping qualities valued in offshore-capable vessels, though the triple keel design makes it particularly well-suited for coastal and inland cruising. Freeman's design emphasizes seaworthiness over speed, evident in the boat's robust construction and conservative proportions. The Seadog 30's reputation centers on its practical nature and ability to access shallow cruising grounds that would challenge deeper-draft vessels. With only 140 built during its eight-year production run, these boats represent a specialized segment of British yacht design focused on practical cruising versatility.

Dimensions & Specifications
LOA (Length Overall) 30.00 ft / 9.14 m
LWL (Waterline Length) 24.00 ft / 7.32 m
Beam 9.50 ft / 2.90 m
Max Draft 3.50 ft / 1.07 m
Displacement 12,765.00 lb / 5,790 kg
Ballast 4,145.00 lb / 1,880 kg
Sail Area (Reported) 399.00 ft² / 37.07 m²
Headroom 6.00 ft / 1.83 m
Design & Construction
Hull Type Triple Keel
Rigging Type Masthead Ketch
Construction FG
Designer Reg Freeman
Builder Glascade GRP Ltd./Reg Freeman Yachts Ltd. (UK)
First Built 1966
Last Built 1974
Number Built 140
Associations SeaDog Owners Association (UK)
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Engine & Accommodations
Engine Make Perkins
Engine Model 4/107
Engine Type Diesel
Horsepower 36
Fuel Capacity 52 gals / 197 L
Water Capacity 46 gals / 174 L
Frequently Asked Questions

What is the Seadog 30's sail area to displacement ratio?

The Seadog 30 has a Sail Area to Displacement ratio (SA/D) of 11.73. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Seadog 30's comfort ratio?

The Seadog 30 has a Ted Brewer Comfort Ratio of 38.12. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Seadog 30 safe for offshore sailing?

The Seadog 30 has a Capsize Screening Formula value of 1.63. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Seadog 30?

The theoretical hull speed of the Seadog 30 is 6.56 kn knots, calculated from its waterline length.

How much does a Seadog 30 weigh?

The Seadog 30 has a displacement of 12,765.00 lb and a length overall (LOA) of 30.00 ft.

Who designed the Seadog 30?

The Seadog 30 was designed by Reg Freeman, first built in 1966.