j 100 sailboat specs

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• Sailboat Guide

J/100 is a 32 ′ 9 ″ / 10 m monohull sailboat designed by Rod Johnstone and built by J Boats starting in 2005.

Rig and Sails

Auxilary power, accomodations, calculations.

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

SA/D = SA ÷ (D ÷ 64) 2/3

• SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
• D : Displacement in pounds.

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Ballast / Displacement * 100

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

• D: Displacement of the boat in pounds.
• LWL: Waterline length in feet

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

• D: Displacement of the boat in pounds
• LOA: Length overall in feet
• Beam: Width of boat at the widest point in feet

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

CSV = Beam ÷ ³√(D / 64)

Shoal draft: 4.5’. Carbon spar opt. Removable Hoyt (self tacking) jib boom opt.

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The J100 is a 32.8ft fractional sloop designed by Johnstone and built in fiberglass resin infusion with balsa sandwich deck and hull by J Boats since 2005.

The J100 is a light sailboat which is a very high performer. It is stable / stiff and has a good righting capability if capsized. It is best suited as a racing boat. The fuel capacity is originally very small. There is a very short water supply range.

J100 for sale elsewhere on the web:

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J-Boat quality and performance come through in this 33-foot daysailer

But these cold facts can't fully describe what it feels like when this boat finds its happy spot. There's a slight tug, not unlike the kind you might experience when catching a brook trout, and then you know you're in the groove, the sails trimmed, the hull slicing across the bay, and nothing but two fingers on the tiller extension where the pressure is barely noticeable. And that's why the J/100 has been generating such excitement at the docks. It's just the sort of vessel sailors have come to expect from J-Boats. Jim knows all about that excitement. Johnstone family lore is filled with it, dating back to the heady days of the mid-1970s when Rod Johnstone built the first J/24 in his garage in Stonington, Connecticut. "Think about it. Here were all these young guys designing and putting together this new kind of boat in a garage, and nobody wanted to build it," Jim said. "They finally convinced Everett Pearson to do it." The 24-footer, Ragtime, had made an impressive showing in regional races in 1976. After that, with designer/builder Pearson on board and agreeing to produce the boat in return for the U.S. building rights, Rod went into the J-Boats business with his brother, Bob. The initial batch of J/24s began popping out of a makeshift factory in an old textile mill in nearby Fall River, Massachusetts, and a legend was born. The J/24 went on to become the most popular recreational offshore keelboat in the world. Johnstone pulled out his palm-sized computer again, fingered the small keyboard and announced that J-Boats has now sold more than 5,300 J/24s, and more are on the way. The spreadsheet told the story, even showing a slight hold-up in production of the latest J/100s due to a quality-control issue. "Some of the floorboards weren't finished properly, so instead of sending the boats out that way, we slowed down the line to make them right," he said. "It'll cause about a two-week delay, but we want these boats to be perfect. Some of the customers are anxious to take delivery, but in the long run, it's better that everything is right from the start." It's this sort of attention to detail that has made the name J-Boats synonymous with quality, and the J/100 is the

latest example.

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• By Nim Marsh
• Updated: February 5, 2005

The J/100 is an interesting counterpoint to the three dayboats featured in this article. Unlike the Hinckley, the Morris, and the Friendship, which began with traditional designs brought into the new millennium via modern underbodies and cutting-edge gear, J/Boats started with a thoroughly modern design, then added state-of-the-art systems and hardware to evoke an age-old carefree feeling of simplicity and efficiency.

Evidently, the approach has worked famously. Hull number one was launched only last July, but by the end of 2004, hull number 23 was close to completion, and orders had been received through hull number 74, which is due to leave the Pearson Composites plant in Warren, Rhode Island, this August. Not only that, but Sailing World named the J/100 its Overall Boat of the Year for 2005.

The J/100 was the brainchild of Bob Johnstone, a founding partner, with his brother, Rod, of J/Boats Inc. “He’s in his 60s, and he wanted a boat for himself that he could sail in Maine,” said J/Boat sales manager Jim Johnstone, son of Rod. “You’re 60, and your mind’s working, but your body isn’t operating quite the way you’d like it to. But you’re still sailing–overnighting or on the beer-can circuit.

“The specific target market for the J/100 is the baby-boomer generation,” Jim added. “The kids are out of the house, and the parents don’t want to have to find crew every time they want to go for a sail. Some J/100 customers have come back into sailing because of the concept of this boat.”

The Hoyt self-tacking jib boom is only one of many attributes that make the J/100 conducive to fast, spontaneous getaways at the end of the work day. For one-design racing, the boomed 90-percent jib can be replaced with a hanked-on jib on a set-back headstay. When using the tiller extension, the helmsman can easily reach the halyard clutches. When the mainsail is raised at the mooring, the J/100 behaves; it doesn’t tend to catch the wind and sail sideways.

Without moving an inch from his steering position, the solo sailor can adjust the hydraulic backstay, tucked out of the way under the tiller, and the traveler adjuster, with its cam cleat conveniently mounted on the Harken windward sheeting car.

The cockpit is voluminous, with 9 1/2-foot seats and nearly 14-inch backrests, yet even short sailors can brace themselves with feet on the leeward seat. All horizontal surfaces are armed with dynamite nonskid, and the side decks are wide and clear for quick action by the solo crew. A telescoping ladder on the stern swim platform is standard; a dodger isn’t. “If you need a dodger,” said Jim, “you probably won’t go sailing.”

Lifelines aren’t required by J/100 class rules, but more than half of the boats have them, and simply installed retrofit kits are available. Handy Wichard flush-folding padeyes are placed strategically on deck, out of the way but ready to receive a spinnaker block, a fender, or a bag full of beers.

The cabin is bare-bones: no galley (just a cooler aft of the starboard settee), no nav station (but plenty of shelf space for navigation tools), no enclosed head (the entire forward cabin converts to a head with a sink and mirrored-door cabinets). A single 95-amp-hour AGM battery under the companionway steps starts the engine and powers the standard automatic bilge pump. Accommodations are port and starboard settees. A V-berth isn’t standard; the area in the forepeak is dedicated to open sail and storage bins. “We’re not allowing any custom options, but we’ve extended the list of standard items,” said Jim. “By eliminating the custom options, we avoid having oddball boats in the class with diminished resale value.”

The plumb-bowed hull is of composite construction using the SCRIMP resin-infusion system and cored with Baltek Contourkore end-grained balsa. For stability, the J/100’s relatively narrow hull depends on a modern fin keel with a wedge-shaped bulb. Eleven gelcoat shades are available. The most popular? A lustrous “flag blue.”

“Old salts tend to check off their requirements as they go through the boat, and it works for them,” said Jim. “Racers look it over and see they can make it as fast as they want. It’s a versatile, idiot-proof boat.”

LOA 32′ 10″ (10 m.) LWL 29′ 0″ (8.84 m.) Beam 9′ 3″ (2.82 m.) Draft 5′ 7″ (1.75 m.) Sail Area 478 sq. ft. (44.4 sq. m.) Ballast 2,500 lb. (1,134 kg.) Displacement 6,500 lb. (2,948 kg.) Auxiliary 10-hp. Volvo saildrive Designer Rodney S. Johnstone Sailaway Price $139,000

J/Boats Inc. (401) 846-8410 www.jboats.com

• More: 2001 - 2010 , 31 - 40 ft , day sailing , J/Boats , monohull , Sailboat Reviews , Sailboats
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J/100 Detailed Review

If you are a boat enthusiast looking to get more information on specs, built, make, etc. of different boats, then here is a complete review of J/100. Built by J Boats and designed by Rod Johnstone, the boat was first built in 2005. It has a hull type of Fin w/bulb & spade rudder and LOA is 10. Its sail area/displacement ratio 26.63. Its auxiliary power tank, manufactured by Volvo or Yanmar, runs on Diesel.

J/100 has retained its value as a result of superior building, a solid reputation, and a devoted owner base. Read on to find out more about J/100 and decide if it is a fit for your boating needs.

Boat Information

Boat specifications, sail boat calculation, rig and sail specs, auxillary power tank, accomodations, contributions, who designed the j/100.

J/100 was designed by Rod Johnstone.

Who builds J/100?

J/100 is built by J Boats.

When was J/100 first built?

J/100 was first built in 2005.

How long is J/100?

J/100 is 8.84 m in length.

What is mast height on J/100?

J/100 has a mast height of 11.58 m.

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J/100 Shoal draft

Sailboat specifications.

• Last update: 13rd March 2020

J/100's main features

J/100's main dimensions, j/100's rig and sails, j/100's performances, j/100's auxiliary engine, j/100's accommodations and layout.

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