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F 12 Gustavsson
Designer: Torsten Gustavsson  ·  Builder: Iw-Varvet (Swe)  ·  First built: 1964
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About the F 12 Gustavsson

Designed by Torsten Gustavsson in 1964, this compact Swedish sailboat represents classic Scandinavian sailing philosophy with its practical lifting keel configuration. Built by Iw-Varvet in Sweden, the F 12 Gustavsson found favor among coastal cruising enthusiasts, with 200 hulls produced during its production run. The boat's lifting keel design makes it particularly well-suited for exploring shallow waters and coastal cruising where variable depths require flexibility. At just under 17 feet overall with a beam of 6.25 feet, this fiberglass sloop offers surprising stability for its size, supported by 242 pounds of ballast. The fractional sloop rig provides manageable sail handling while delivering respectable performance with 129 square feet of working sail area. With a displacement of 639 pounds and hull speed of 5.13 knots, the F 12 strikes a balance between portability and seaworthiness. The comfort ratio of 5.63 suggests a relatively stiff, quick motion suited to day sailing and short coastal passages rather than extended cruising. The capsize screening formula of 2.9 indicates good stability characteristics for a boat of this size, making it appropriate for protected waters and moderate coastal conditions with experienced crew.

Core Dimensions
LOA (Length Overall) 16.73 ft / 5.10 m
LWL (Waterline Length) 14.63 ft / 4.46 m
Beam 6.25 ft / 1.91 m
Max Draft 2.95 ft / 0.90 m
Displacement 639.00 lb / 290 kg
Ballast 242.00 lb / 110 kg
Sail Area (Reported) 129.00 ft² / 11.98 m²
Design & Construction
Hull Type Lifting Keel
Rigging Type Fractional Sloop
Construction FG
Designer Torsten Gustavsson
Builder IW-Varvet (SWE)
First Built 1964
Number Built 200
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Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
 27.86
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
 37.87
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
 91.1
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
 5.63
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
 2.9
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 5.13 kn
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. 326.72 pounds/inch
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