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Zip
Designer: Harold Brainard  ·  Builder: Brainard Boat Works/Zip Sloops Inc. (Usa)  ·  First built: 1933
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About the Zip

Originally launched in 1933, this compact Harold Brainard design represents one of the earlier examples of affordable small-boat sailing that helped democratize the sport. With over 1,000 hulls built by Brainard Boat Works and later Zip Sloops Inc., the Zip established itself as a popular choice for sailing enthusiasts seeking an accessible entry into the hobby. At 17 feet overall, the Zip's fractional sloop rig and fin keel configuration deliver responsive handling that makes it particularly well-suited for day sailing, sailing instruction, and small boat racing. The wood and fiberglass single-chine construction reflects the transitional era when builders were experimenting with combining traditional materials with emerging fiberglass technology. The boat's relatively low displacement of 1,000 pounds paired with 130 square feet of sail area creates a lively sailing character, while the 6-foot beam provides adequate stability for its size. The 2-foot draft allows access to shallow waters and easy trailering, making it ideal for exploring protected coastal areas, lakes, and bays. With a comfort ratio of 8.71 and capsize screening formula of 2.4, the Zip is clearly intended for protected waters rather than offshore ventures, positioning it perfectly as a spirited day sailer and trainer.

Core Dimensions
LOA (Length Overall) 17.00 ft / 5.18 m
LWL (Waterline Length) 16.00 ft / 4.88 m
Beam 6.00 ft / 1.83 m
Max Draft 2.00 ft / 0.61 m
Displacement 1,000.00 lb / 454 kg
Sail Area (Reported) 130.00 ft² / 12.08 m²
Design & Construction
Hull Type Fin Keel
Rigging Type Fractional Sloop
Construction Wood /FG single chine
Designer Harold Brainard
Builder Brainard Boat Works/Zip Sloops Inc. (USA)
First Built 1933
Number Built 1000
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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
20.84
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
108.99
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
8.71
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
2.4
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. 5.36 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. 343.02 pounds/inch
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