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Sailboat Specifications

Hydro 28

Fractional Sloop · Fin W/Transom Hung Rudder

Designed by David Thomas · Built by Seaglass (Uk) · First built 1978

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LOA 27.92 ft  ·  Beam 10.01 ft  ·  Displacement 5,401.00 lb  ·  Fractional Sloop  ·  Fin W/Transom Hung Rudder
About the Hydro 28 Sailboat

Designed by David Thomas and built by Seaglass in the UK starting in 1978, the Hydro 28 represents British yacht design philosophy of the late 1970s. This 28-footer features a moderate displacement hull with a fin keel and transom-hung rudder configuration, paired with a fractional sloop rig that provides versatile sailing characteristics. With her 5,401-pound displacement and traditional fiberglass construction, the Hydro 28 strikes a balance between performance and stability that makes her well-suited for coastal cruising and club racing. The boat's 10.01-foot beam provides comfortable interior volume while maintaining reasonable sailing performance, with a hull speed of 6.53 knots. Her comfort ratio of 15.52 indicates a relatively stiff, quick motion that experienced sailors will appreciate, while the capsize screening formula of 2.29 suggests good stability for coastal and near-shore sailing. The moderate draft of 5.58 feet allows access to most harbors while providing adequate ballast for windward performance. The Hydro 28's fractional rig offers excellent sail handling characteristics and the ability to depower in stronger conditions, making her an appealing choice for sailors seeking a manageable yet capable coastal cruiser with some racing potential.

Dimensions & Specifications
LOA (Length Overall) 27.92 ft / 8.51 m
LWL (Waterline Length) 23.75 ft / 7.24 m
Beam 10.01 ft / 3.05 m
Max Draft 5.58 ft / 1.70 m
Displacement 5,401.00 lb / 2,450 kg
Design & Construction
Hull Type Fin w/transom hung rudder
Rigging Type Fractional Sloop
Construction FG
Designer David Thomas
Builder Seaglass (UK)
First Built 1978
Associations Half Ton Class
Related Sailboats Tanzer 85 · Islander 28 · Cc 27 Mk Iii · Dehler 28 · Ajax 28
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Frequently Asked Questions

What is the Hydro 28's comfort ratio?

The Hydro 28 has a Ted Brewer Comfort Ratio of 15.52. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Hydro 28 safe for offshore sailing?

The Hydro 28 has a Capsize Screening Formula value of 2.29. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Hydro 28?

The theoretical hull speed of the Hydro 28 is 6.53 kn knots, calculated from its waterline length.

How much does a Hydro 28 weigh?

The Hydro 28 has a displacement of 5,401.00 lb and a length overall (LOA) of 27.92 ft.

Who designed the Hydro 28?

The Hydro 28 was designed by David Thomas, first built in 1978.