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 drawn by Rod Johnstone and introduced in 1984, with 189 hulls built. Conceived as a lowbudget racing boat, it carries the minimalist ethos of the J/Boats line into a lightweight planing hull meant 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 3,800-pound displacement balanced by 1,530 pounds of lead ballast on a fin keel. The 40.26 ballast-displacement ratio and 2.18 capsize ratio describe a stiff speed machine rather than a cruiser. Solid fiberglass hull and deck keep construction straightforward, and the transom-hung rudder gives direct steering feel. With 364 square feet of sail on the fractional rig and a 4-foot 11-inch draft, she is built to skim.

Rig and Handling

On the racecourse the J/27 demands a crew of five to seven people to sail to her potential, and her PHRF rating spans 17 to 129. Sailing World found she sails to her rating best in light or heavy air, while she has trouble in medium air mostly because of the shorter waterline length. The fractional rig and transom-hung rudder make her quick to respond.

Accommodations

The J/27's identity as a low-budget racer argues against expecting comforts. The 13.94 comfort ratio confirms a deliberately firm ride, and the trade from liveaboard space to race-night performance was made at the drawing board.

Known Issues

Some boats need simple upgrades to get ready for racing, such as new halyards, adjustable leads, and a new backstay. That points to normal wear on running and standing rigging across a decades-old fleet rather than a hull or deck flaw.

Refits and Ownership

The simple upgrades above are the typical outfitting steps an incoming owner faces before a season of racing. The uncomplicated solid-glass construction means a surveyor's job is legible.

The Verdict

The J/27 is a purist's racing machine: light, stiff, and quick in the breezes where it matters, but unapologetically bare below and marginal in medium air.

Pros

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

Cons

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

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