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Sailboat Specifications

Seidelmann 25

Masthead Sloop · Fin W/Spade Rudder

Designed by Bob Seidelmann · Built by Seidelmann Yachts (Usa) · First built 1977

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LOA 24.60 ft  ·  Beam 9.50 ft  ·  Displacement 4,600.00 lb  ·  Sail Area 281.00 ft²  ·  Masthead Sloop  ·  Fin W/Spade Rudder
About the Seidelmann 25 Sailboat

Introduced in 1977, this compact cruiser from designer Bob Seidelmann represents thoughtful engineering in a trailerable package. Built by Seidelmann Yachts with fiberglass construction, the boat features a modern fin keel with spade rudder configuration that delivers responsive handling and good upwind performance despite its modest 24.60-foot overall length. The design strikes an appealing balance between comfort and sailing ability, with a generous 9.50-foot beam providing stable accommodations while maintaining a respectable sail area of 281 square feet on a masthead sloop rig. The substantial displacement of 4,600 pounds, nearly half of which is ballast, contributes to predictable sailing characteristics and seaworthiness that exceeds what many expect from a boat this size. With a comfort ratio of 16.58, the Seidelmann 25 leans toward the performance end of the spectrum while still offering adequate creature comforts for weekend cruising or coastal exploration. The 4.33-foot draft allows access to moderately shallow waters, making it versatile for gunkholing and small harbor exploration. This design appeals to sailors seeking their first keelboat or those wanting a manageable coastal cruiser that can be trailered to different sailing grounds.

Dimensions & Specifications
LOA (Length Overall) 24.60 ft / 7.50 m
LWL (Waterline Length) 20.00 ft / 6.10 m
Beam 9.50 ft / 2.90 m
Max Draft 4.33 ft / 1.32 m
Displacement 4,600.00 lb / 2,087 kg
Ballast 2,200.00 lb / 998 kg
Sail Area (Reported) 281.00 ft² / 26.11 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Bob Seidelmann
Builder Seidelmann Yachts (USA)
First Built 1977
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Frequently Asked Questions

What is the Seidelmann 25's sail area to displacement ratio?

The Seidelmann 25 has a Sail Area to Displacement ratio (SA/D) of 16.3. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Seidelmann 25's comfort ratio?

The Seidelmann 25 has a Ted Brewer Comfort Ratio of 16.58. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Seidelmann 25 safe for offshore sailing?

The Seidelmann 25 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 Seidelmann 25?

The theoretical hull speed of the Seidelmann 25 is 5.99 kn knots, calculated from its waterline length.

How much does a Seidelmann 25 weigh?

The Seidelmann 25 has a displacement of 4,600.00 lb and a length overall (LOA) of 24.60 ft.

Who designed the Seidelmann 25?

The Seidelmann 25 was designed by Bob Seidelmann, first built in 1977.