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J 7
Designer: Alan Johnstone  ·  Builder: J/Boats  ·  First built: 2024
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About the J 7

With extremely limited specifications available, the J 7 sailboat remains something of an enigma in the sailing world. This scarcity of detailed information suggests either a very limited production run or a boat that didn't achieve widespread market penetration during its manufacturing period. Based on the "J" designation, this vessel likely shares DNA with other boats from manufacturers who have used similar naming conventions, though without concrete specifications, it's challenging to determine the exact lineage or design philosophy. The numeral "7" in sailboat nomenclature often indicates either the boat's length in meters or its position in a manufacturer's model lineup. What can be reasonably inferred is that any sailboat carrying this designation would have been designed with period-appropriate construction methods and sailing characteristics. For prospective buyers researching the J 7, the limited available data makes thorough inspection and professional survey absolutely essential before purchase. The rarity of comprehensive specifications actually adds to the boat's mystique, though it also means potential owners should be prepared for challenges in sourcing parts, documentation, or finding others with similar vessels for advice and community support.

Core Dimensions
LOA (Length Overall) 23.11 ft / 7.04 m
LWL (Waterline Length) 20.84 ft / 6.35 m
Beam 8.11 ft / 2.47 m
Max Draft 3.80 ft / 1.16 m
Displacement 2,300.00 lb / 1,043 kg
Ballast 1,050.00 lb / 476 kg
Sail Area (Reported) 256.00 ft² / 23.78 m²
Design & Construction
Hull Type Fin w/bulb and transom hung rudder
Rigging Type Fractional Sloop
Construction Composite / E-glass; Corecell foam core
Designer Alan Johnstone
Builder J/Boats
First Built 2024
Owner Reviews

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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
23.56
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
10.16
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
2.46
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. 6.12
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
4.97
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. 603.9
Rig Dimensions
I (Foretriangle Height) 27.0
J (Foretriangle Base) 8.07
P (Mainsail Luff) 27.0
E (Mainsail Foot) 10.88
SA Fore 108.95
SA Main 146.88
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