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Storm 18
Designer: Bob Ames  ·  Builder: Storm Marine Group (Usa)  ·  First built: 2025
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About the Storm 18

Bob Ames has crafted an intriguing compact cruiser with the Storm 18, a newly introduced design that maximizes sailing potential within an 18-foot package. Built by Storm Marine Group and first launched in 2025, this fractional sloop represents a fresh approach to small boat cruising with surprising capability for its size. The lifting keel with bulb configuration stands out as the boat's defining feature, allowing shallow water exploration while maintaining excellent stability when the keel is deployed. At 1,322 pounds with nearly half that weight in ballast, the Storm 18 delivers impressive stability for coastal cruising and protected water sailing. The substantial ballast-to-displacement ratio contributes to confident handling in moderate conditions. With a sail area to displacement ratio of 26.21, this design offers spirited performance without being overly aggressive, making it suitable for both novice and experienced sailors seeking a manageable yet capable small cruiser. The transom-hung rudder provides positive helm feedback while simplifying construction and maintenance. The low comfort ratio of 8.83 reflects the boat's emphasis on sailing performance over accommodations, while the capsize screening value of 2.51 indicates good stability characteristics. This fiberglass construction promises durability and straightforward maintenance, appealing to sailors wanting reliable coastal exploration in a trailerable package.

Core Dimensions
LOA (Length Overall) 18.47 ft / 5.63 m
LWL (Waterline Length) 17.36 ft / 5.29 m
Beam 6.89 ft / 2.10 m
Max Draft 4.10 ft / 1.25 m
Displacement 1,322.77 lb / 600 kg
Ballast 654.77 lb / 297 kg
Sail Area (Reported) 196.98 ft² / 18.30 m²
Design & Construction
Hull Type Lifting keel w/bulb; trans. hung rudder
Rigging Type Fractional Sloop
Construction FG
Designer Bob Ames
Builder Storm Marine Group (USA)
First Built 2025
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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
 26.21
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
 49.5
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
 112.87
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
 8.83
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
 2.51
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. 5.58 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. 427.38 pounds/inch
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