J-Boats J/100 Sailboat Review, Specs, and Listings

Johnstone·2005·J-Boats
J-Boats J/100 drawingBuilder drawing
Hull Type
Monohull · bulb
Rig
Fractional Sloop
LOA
32.8' · 10 m
Disp.
6,500 lbs · 2,948 kg
First year
2005

The J/100 arrived as a deliberate counterpoint to the minimalist dayboats of its era. Conceived by Bob Johnstone with designer Rodney S. Johnstone, this 32foot 10inch thoroughbred was aimed squarely at babyboomer sailors who wanted modern performance without complication. Sailing World named it Overall Boat of the Year for 2005.

Measurements

Dimensions 01

Length Overall
32.8 ft
Length on deck
—
Waterline Length
29 ft
Beam
9.28 ft
Draft
5.75 ft
Maximum Headroom
—
Air Draft
—

Construction & hull 02

Hull
Fiberglass
Hull Type
Monohull
Keel Type
Bulb
Rudder
1× Spade
Ballast
2,450 lbs (Lead)
Displacement
6,500 lbs
Water Capacity
15 gal
Fuel Capacity
10 gal

Rig & sails 03

Rigging Type
Fractional Sloop
Mainsail luff
38 ft
Mainsail foot
13.5 ft
Foretriangle height
38.5 ft
Foretriangle base
11.5 ft
Forestay Length (estimated)
40.18 ft
Sail Area
578 sqft

Calculations 04

Sail Area to Displacement Ratio
26.55
Ballast to Displacement Ratio
37.69
Displacement to Length Ratio
118.98
Comfort Ratio
17.14
Capsize Screening Ratio
1.99
Hull Speed
7.22 kn

Hull number one launched in mid-2004. By the end of that year, hull number 23 was nearing completion, and orders through number 74 were booked for an August 2005 departure from the Rhode Island plant. That rapid production ramp-up underscored how readily the concept found buyers.

Design and Construction

The J/100 has a plumb bow and a relatively narrow 9-foot 3-inch beam. Its hull uses composite construction and the SCRIMP resin-infusion system, with an end-grain balsa core creating a light, stiff laminate.

Stability comes not from beam but from a modern fin keel with a wedge-shaped lead bulb. The boat carries 2,500 pounds of ballast against a displacement of 6,500 pounds.

Buyers could choose from 11 gelcoat shades, of which a lustrous “flag blue” proved most popular. All horizontal deck surfaces have aggressive nonskid. The side decks are wide and clear, allowing a single crew member to move forward without obstruction.

Rig and Handling

The self-tacking Hoyt jib boom is only one of several attributes intended to make fast, spontaneous departures easy. For one-design racing, the boomed 90-percent jib gives way to a hanked-on jib on a set-back headstay.

A solo sailor need never leave the helm. A tiller extension puts the halyard clutches within reach, the hydraulic backstay adjuster is tucked beneath the tiller, and the traveler cam cleat sits on a Harken windward-sheeting car.

With the mainsail raised at the mooring, the boat behaves rather than sailing off sideways—a tribute to its modern underbody and balanced rig. Class rules don’t require lifelines, although more than half of the boats built carry them. Flush-folding Wichard padeyes are strategically positioned for cockpit control.

Cockpit and Deck

The cockpit is genuinely spacious, with 9½-foot seats and nearly 14-inch backrests that let the crew stretch out on a reach. A telescoping ladder on the stern swim platform is standard.

The wide, clear side decks support short-handed maneuvering. With no class requirement for lifelines and an uncluttered foredeck, the boat has an almost dinghy-like profile that suits its stated aim of carefree simplicity.

Accommodations and Systems

This is a dayboat first, and the cabin reflects that discipline. Food storage is limited to a cooler behind the starboard settee. There’s no dedicated navigation station, only shelf space for instruments.

Nor is there an enclosed head. Instead, the forward cabin serves as the head and includes a sink and cabinets with mirrored doors. Sleeping space is limited to the port and starboard settees. A V-berth was never standard; the open forepeak contains bins for sails and other gear.

A single 95-amp-hour AGM battery beneath the companionway steps starts the 10-horsepower Volvo saildrive and powers the standard automatic bilge pump.

Verdict

The J/100 succeeds as a modern interpretation of the simple daysailer. It combines self-tacking and hydraulic systems with a light, infusion-built hull, allowing one person to sail it hard without much fuss. It isn’t a cruiser—the cabin is deliberately bare—but for its intended sailor, that’s the point.

Pros

  • Self-tacking jib boom and helm-side controls support true single-handed sailing
  • Light, stiff SCRIMP-and-balsa hull with an efficient fin-and-bulb keel despite the narrow beam
  • Spacious cockpit with long seats and a standard swim ladder
  • Stays put at the mooring with the mainsail raised; stable and well-mannered

Cons

  • No galley, navigation station, or enclosed head, limiting overnight use
  • No standard V-berth; the forepeak is reserved for sails and gear
  • Lifelines are optional under class rules, although more than half of the boats built carry them

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