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 sailboat under sail

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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.

Drawing of J/100

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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  • By Nim Marsh
  • Updated: February 5, 2005

j100 sailboat data

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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j100 sailboat data

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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j100 sailboat data

j100 sailboat data

  • J/Boats Home
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j100 sailboat data

The "Amazing Grace" This elegant J100 is the most recently re-fitted and upgraded boat on the market. The J/100 is proven both as a daysailer and for inshore racing. Now based in Falmouth, Maine, Amazing Grace was originally freshwater boat until purchased re-fitted as a dual purpose sailboat in 2017. Her current owner is a highly experienced And successful cruising and racing sailor (with a track record of class wins both in the US and internationally) who knows how to keep a boat in top condition, however, due to a chant In family circumstances, she has been very little used since being re-fitted and raced only once (a short club race that she won handily even without her new race sails.)

Make or Manufacturer

Length overall.

j100 sailboat data

Amazing Grace was optimized in 2017 by International Marine of Rhode Island, including a new Aristo Blue with over $22,000 of upgrades with an Awl-grip hull in Aristo Blue, a smooth race-ready- bottom and a retractable bowsprit. In this configuration, the J/100 has a proven race record under PHRF, and yet remains the complete daysailer. In addition to her 2017 re-fit, this boat has three new race sails by North and new B&G instruments that were installed in 2019.

There's nothing quite like steering a sleek, fast boat with a light touch on the tiller, the stability of a keel below, being close to the water and sliding through waves with barely awake or whisper. Time is too precious and the alternatives too numerous to put up with any boat less than what will recapture those simple joys of sailing. J/100 is designed, and Amazing Grace has been further optimized to do just that. The comforts that experienced sailors appreciate are part of the package. A two-cylinder inboard sail drive hums along at 6.5 knots like a sewing machine, when you can hear it. Why limit your horizons because the wind might die? There are a bona fide marine head and even a couple of bunks.

j100 sailboat data

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comparisons J100 vs Alerion 28

  • Add to quote

I am looking into buying a good sailing daysailing boat. I don't plan to sleep on it but would like a marine head and inboard engine. I've narrowed the search to the J100 and Alerion 28. How much light air sailing will I be giving up the the alerion 28 and will my wife be hanging on with her fingernails with the J100? Just trying to narrow down the tradeoffs. Thanks for any help!  

NOLAsailing

Both are excellent, excellent boats. The Alerion has been around a little longer and you can find used ones at reasonable prices. They are simply stunning boats. I think the resale would be better with the Alerion. The J is definitely more performance oriented, but it looks fairly sedate, compared to the 105, for example. I've sailed against one, but I've never been aboard a J100. Although I am a huge fan of J-Boats (I own a J/30), I would lean more towards the Alerion if you aren't planning to race. It should be a very easy boat to sail, it strikes me as having a more comfortable cockpit, and I really love the looks. Both are great boats though.  

Jeff_H

The way I look at it, they are both built in the same place so have equal build quality, so it simply comes down to ease of handling, cost, and sailing ability, and I am not going to comment on cost. The J-100 should be a better sailing boat and easier to handle. The older Alerion 28's had a J-27 rig, (not that easy a rig to handle) especially since they relied on big genoas in light air, and the new ones have some kind of Hoyt creation, promoted as easy to handle but which limits the tools to deal with changeable conditions, tools which come standard as a part of the J-100 rig. I would think that the 'wife hanging on by her fingertips' would be pretty much the same between the two but the J-100 would sail rings around the Alerion. Jeff  

Thanks for your responses. Money aside I think the looks of the alerion 28 are suberb, but the sailing qualities of the J100 are superior. If that alerion sails anywhere near as good as she looks I think I'm headed that way!  

Alerion is Slooow per http://www.phrfne.org/page/handicapping/base_handicaps the various Alerion 28 models (five???) rate from 165 to 177 while the J100 (5 configs) rates from 78 to 102. My reading of these numbers is that while the Alerion is a sharp looking boat, it is not much of a sailing performer, the J100 would be two classes ahead.  

sailingdog

Isn't the J100 a bigger boat than the A28??? I thought the J100 was a ten-meter boat, about 32' versus the 28' Alerion.  

The J100 is a just shy of 33 ft. So yes it is a bigger boat and even Garry Hoyt at Alerion admits the J100 is a quicker boat. With all the variable winds of New england I think a person will get more sailing time on the J100. So here I go rethinking my position and leaning towards the J100. Actually sailing the 2 boats will help.  

blt2ski

For me in the NW< ie puget sound, with varible winds, a J100 would win hands down. I've looked at both, not sailed either, but the J100 looks weekendable, better interior options, along with faster, some possible 1D racing depending upon how many are local etc. Altho, I would probably jump to a 105 personally if looking at a 100. Those can be found used for a bit less cost if that is an option, ie use. New would obviously be more $$. Marty  

Here's a difference that may merit some consideration. The J-100 has vitrually no exterior teak whereas the Alerion has what I would consider a lot of exterior teak. Also, on a head to head comparison, The J-100 has more in common with the Alerion 33 than the Alerion 28. Both are gorgeous. Last I checked, a new J-100 was about $100k and the Alerion 33 around $250k.  

A new J100 is more like $145-150,000 sailaway. Your close on the alerion 33. The alerion 28 is around $120,000. Alot of the j100's have teak toerails. Although some work, some exterior teak looks pretty nice. Gotta make the wife happy as well. Thanks  

Having never sailed a "J" before. Wouldn't the alerion 28 be a much easier singlehanded or "sail with the wife" boat? Most times you see a 'J" there are 3 or 4 people on the rail. I'm not sure I've seen many "J"'s with cockpit cushions.  

From that picture the "J" looks like the perfect boat. Some racing would be fun and interesting but a sail with the wife is an option as well.  

I did get on a J100 this weekend. Although we didn't get to sail it, it was a very impressive looking and feeling boat. Comfortable huge cockpit, great lines and sleak looking. Can't wait to sail one.  

Sailed a J100 this weekend. I was puzzled by the fact that there wasn't anyplace for any foot leverage when at the tiller when sitting on the coaming. You can only put your feet on top of the cockpit seat.  

The foot placement as you mention, ie you sitting on the combing/feet on the seat, is the same for my jeanneau. It was teh same for my stepdads Glen-L 21 he built, and just about every other boat I have been on. While sitting on the seats, there is many times actual foot rests. Marty  

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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.

J/Boats J/100  Picture extracted from the commercial documentation © J/Boats

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IMAGES

  1. J/100 shoal draft (J/Boats) sailboat specifications and details on Boat

    j100 sailboat data

  2. J/100 shoal draft (J/Boats) sailboat specifications and details on Boat

    j100 sailboat data

  3. J/100

    j100 sailboat data

  4. J/100 standard (J/Boats) sailboat specifications and details on Boat

    j100 sailboat data

  5. J/100

    j100 sailboat data

  6. J/100

    j100 sailboat data

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COMMENTS

  1. J/100

    The total combined area of the sails when sailing upwind. S.A. (reported) is the area reported by the builder. (Verses ** S.A. (100% Fore + Main Triangles) which is the area as defined by the rig measurements.) S.A. (reported) can differ depending on the size of the head sail used to calculate the S.A.

  2. Tech Specs

    Two-tone (beige) molded nonskid floor in head area. Teak trimmed backrest outboard of each settee berth. Marine head with 14 gal holding tank and "Y" valve. Molded sink with overboard drain in head. Holding tank overboard discharge manual pump. Teak trimmed storage bin to starboard of head.

  3. J/100

    Time's too precious and the alternatives too numerous to put up with any boat less than what will recapture those simple joys of sailing. J/100 is designed to do just that. The comforts that experienced sailors appreciate are part of the package. A two cylinder inboard saildrive hums along at 6.5 knots like a sewing machine, when you can hear it.

  4. J/100

    Sailboat specifications. Last update: 13rd March 2020. The J/100 is a 32'10" (10m) dayboat designed by Rod Johnstone (United States). She was built since 2004 (and now discontinued) by J/Boats (United States). The J/100 is as well listed, on Boat-Specs.com, in Shoal draft version ( see all the versions compared ).

  5. J100

    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.

  6. J/100

    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. Formula. 37.69. <40: less stiff, less powerful.

  7. J/100

    The trend toward designing beamy aft sections and jamming every conceivable convenience into bigger and bigger production cruising boats continues, but the folks at J Boats are taking a different tack with the new J/100. It's a sleek, narrow 33-foot daysailer/weekender that's touted to provide the sailing performance J Boats is known for without any of the hassle that sometimes accompanies bigger

  8. J/100

    J/Boats. 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 ...

  9. J/100

    6,000 lbs. Sail area. 478 sq ft. Power. 15-hp Yanmar diesel. As first impressions go, J/100 hull number two stood out in fine company moored off the New York Yacht Club's Harbour Court facility in Newport, Rhode Island. From shore I sized up the boat lying still at her mooring plumb bow, clean and simple deck, wide-open cockpit, narrow blue ...

  10. J/100-The Perfect Day Racer/Weekender

    The J/100 feels like a large, stable dinghy with speed. When stepping aboard you feel that slight heel which you tend to feel in most light keelboats, probably because it only displaces 6000 ...

  11. J/100 Sail Data

    Complete Sail Plan Data for the J/100 Sail Data. Sailrite offers free rig and sail dimensions with featured products and canvas kits that fit the boat. ... Sailboat Data ; J/100 Sail Data ; J/100 Sail Data. Pinit. SKU: X-SD-8458 . Quantity discounts available . Quantity Price; Quantity -+ Add to Cart . Details.

  12. J/100

    On the numbers side, the J/100 is 32.8 feet in length overall, 29 feet at the water line. The beam is 9.25 feet, the standard draft 5.75 feet, with a shoal keel option reducing the latter to 4.15 feet. The boat displaces 6,500 pounds, or three and a quarter tons. The sails, when 100 percent unfurled, cover 478 square feet.

  13. Articles & Review

    SAILING WORLD REVIEW. J/100-The Perfect Day Racer/Weekender. J Boats, with their slogan "Better Boats for People who Love to Sail," has done it again. The J/100, a sleek 33-footer, has all the ingredients for a winning Boat of the Year formula: looks, simplicity, speed, and price. The J/100 is eye-catching mooring candy.

  14. J Boats J 100 boats for sale

    2006 J Boats J/100. US$70,556. US $552/mo. Parton Yachting | Port Grimaud, 83 - Var. Request Info. <. 1. >. * Price displayed is based on today's currency conversion rate of the listed sales price.

  15. J/100

    The "Amazing Grace" This elegant J100 is the most recently re-fitted and upgraded boat on the market. The J/100 is proven both as a daysailer and for inshore racing. Now based in Falmouth, Maine, Amazing Grace was originally freshwater boat until purchased re-fitted as a dual purpose sailboat in 2017. Her current owner is a highly experienced And successful cruising and racing sailor (with a ...

  16. Boat: 2005 J Boats J100

    The 2005 J J100 sailboat has a fiberglass hull and has an overall length of 33 feet (sometimes referred to as LOA). The width (or beam) of this craft is 93 inches. This boat is rigged as a Sloop. The sail area for the sailboat is 484 square feet. The displacement for the boat is approximately 6000 lbs.

  17. J/105

    Kelsall Sailing Performance (KSP): Another measure of relative speed potential of a boat. It takes into consideration "reported" sail area, displacement and length at waterline. The higher the number the faster speed prediction for the boat. A cat with a number 0.6 is likely to sail 6kts in 10kts wind, a cat with a number of 0.7 is likely ...

  18. comparisons J100 vs Alerion 28

    The J100 is a just shy of 33 ft. So yes it is a bigger boat and even Garry Hoyt at Alerion admits the J100 is a quicker boat. With all the variable winds of New england I think a person will get more sailing time on the J100. So here I go rethinking my position and leaning towards the J100. Actually sailing the 2 boats will help.

  19. J/110

    Kelsall Sailing Performance (KSP): Another measure of relative speed potential of a boat. It takes into consideration "reported" sail area, displacement and length at waterline. The higher the number the faster speed prediction for the boat. A cat with a number 0.6 is likely to sail 6kts in 10kts wind, a cat with a number of 0.7 is likely ...

  20. J/100 Shoal draft

    Sailboat specifications. The J/100 is a 32'10" (10m) dayboat designed by Rod Johnstone (United States). She was built since 2004 (and now discontinued) by J/Boats (United States). The Shoal draft version features a shorter keel to grant access to shallow areas. The J/100 is as well listed, on Boat-Specs.com, in Standard version ( see all ...

  21. ORC sailboat data

    Greatest maximum speed (kts) POL20180 I LOVE POLAND 24.52. USA/CAY007 Vesper 19.67. GER7111 VARUNA 19.44. GER/BOD49 WILD LADY 19.09. USA45 BELLA MENTE 18.46. ITA18215 ANYWAVE 17.96. GER7323 MILAN 17.92. USA28686 OC-86 17.8.

  22. J/105 Technical Specifications

    White gel coat hull with single (1.50" to 3.00") tapered bootstripe. Large sit-in cockpit with 6.5' seats with backrests, suitable for cockpit cushions. One lazarette locker and two cockpit seat lockers w/flush spring loaded latches. Swimming and boarding platform sculptured into transom with integral ladder.