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Seidelmann 25 Sd
Designer: Seidelmann  ·  Builder: Seidelmann Yachts (Usa)  ·  First built: 1977
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About the Seidelmann 25 Sd

Produced by Seidelmann Yachts, a builder known for crafting capable and well-finished fiberglass sailboats during the latter half of the twentieth century, the 25 Sd represents the brand's approach to creating an accessible yet genuinely seaworthy small cruiser. Designed with the weekend sailor and coastal cruiser in mind, this compact vessel strikes a balance between manageable size and practical liveability, making it an appealing option for those stepping up from a dinghy or entering the world of keelboat ownership. Seidelmann developed a reputation for building boats with solid construction and comfortable interiors relative to their size, and the 25 Sd reflects that philosophy. Her proportions suggest a vessel well-suited to day sailing, weekend getaways, and sheltered coastal passages, offering a stable and forgiving platform for sailors of varying experience levels. While detailed specifications remain limited, buyers researching this model will find that Seidelmann's general build quality and reputation for reliable, no-nonsense cruising boats makes the 25 Sd worth serious consideration for those seeking an affordable and dependable entry into keel sailing.

Core Dimensions
LOA (Length Overall) 24.50 ft / 7.47 m
LWL (Waterline Length) 20.00 ft / 6.10 m
Beam 9.50 ft / 2.90 m
Max Draft 3.33 ft / 1.01 m
Displacement 4,600.00 lb / 2,087 kg
Ballast 2,200.00 lb / 998 kg
Design & Construction
Hull Type Fin Keel
Rigging Type Masthead Sloop
Construction FG
Designer Seidelmann
Builder Seidelmann Yachts (USA)
First Built 1977
Owner Reviews

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Performance Ratios
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
47.83
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
256.7
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 4.07 pounds/inch
Rig Dimensions
I (Foretriangle Height) 16.30
J (Foretriangle Base) 10.90 ft / 3.32 m
P (Mainsail Luff) 281.00 ft² / 26.11 m²
E (Mainsail Foot) 256.70
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