J-Boats J/27 Sailboat Review, Specs, and Listings

Johnstone·1984 – 1992·~189 hulls·J Boats Tillotson Pearson
Approximate drawing

Hover a measurement to read its value

Hull Type
Monohull · fin
Rig
Fractional Sloop
LOA
27.5' · 8.38 m
Disp.
3,800 lbs · 1,724 kg
First year
1984

The J/27 is a 27foot fractionalsloop racer designed by Rod Johnstone and introduced in 1984. With 189 hulls built, it brought the minimalist J/Boats ethos to sailors looking for a lowbudget race boat: a lightweight planing hull intended for an amateur crew without a professional’s budget.

Measurements

Dimensions 01

Length Overall
27.5 ft
Length on deck
—
Waterline Length
23 ft
Beam
8.5 ft
Draft
4.9 ft
Maximum Headroom
—
Air Draft
—

Construction & hull 02

Construction
Fiberglass
Hull Type
Monohull
Keel Type
Fin
Rudder
1× Transom-Hung
Ballast
1,530 lbs (Lead)
Displacement
3,800 lbs
Water Capacity
—
Fuel Capacity
—

Rig & sails 03

Rigging Type
Fractional Sloop
Mainsail luff
33 ft
Mainsail foot
12.5 ft
Foretriangle height
30 ft
Foretriangle base
10.5 ft
Forestay Length (estimated)
31.78 ft
Sail Area
364 sqft

Calculations 04

Sail Area to Displacement Ratio
23.91
Ballast to Displacement Ratio
40.26
Displacement to Length Ratio
139.43
Comfort Ratio
13.94
Capsize Screening Ratio
2.18
Hull Speed
6.43 kn

Design and Construction

The J/27 measures 27.5 feet overall, with a 23-foot waterline, an 8.5-foot beam, and a 4-foot 11-inch draft. It displaces 3,800 pounds and carries 1,530 pounds of lead ballast on a fin keel.

A 40.26 ballast-displacement ratio and 2.18 capsize ratio describe a stiff speed machine rather than a cruiser. The hull and deck are solid fiberglass, keeping construction straightforward, while the transom-hung rudder provides direct steering feel. With 364 square feet of sail on its fractional rig, the J/27 is built to skim.

Rig, Crew, and Handling

The fractional rig and transom-hung rudder make the J/27 quick to respond. On the racecourse, however, it needs a crew of five to seven to sail to its potential.

Its PHRF rating spans 17 to 129. Sailing World found that the boat sails to her rating best in light or heavy air. It has more trouble in medium air, largely because of its shorter waterline length.

Accommodations

As a low-budget racer, the J/27 makes few concessions to comfort. Its 13.94 comfort ratio reflects a deliberately firm ride, and the trade from liveaboard space to race-night performance was made at the drawing board. By cruising standards, the accommodations are minimal.

Known Issues and Ownership

Some boats need straightforward upgrades before they’re ready to race, including new halyards, adjustable leads, and a new backstay. These are typical outfitting jobs for an incoming owner preparing for a season and point to normal wear in the running and standing rigging of a decades-old fleet, rather than to a flaw in the hull or deck.

The uncomplicated solid-fiberglass construction also makes the boat’s condition relatively legible to a surveyor.

The Verdict

The J/27 is a purist’s racing machine: light, stiff, and quick in the breezes where it matters. In return, it’s unapologetically bare below, needs a substantial crew, and is marginal in medium air.

Pros

  • Light 3,800-pound displacement and 1,530 pounds of lead ballast create a stiff, quick platform
  • Sails to its rating best in light and heavy air
  • Simple solid-fiberglass construction eases ownership

Cons

  • Needs a crew of five to seven to race properly
  • Shorter waterline limits medium-air performance
  • Minimal accommodations by any cruising standard

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