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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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- 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 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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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 cylinder Yanmar 15HP diesel saildrive engine with geared folding prop. Engine instrument panel with tachometer, engine hour gauge and water, oil pressure alarms in cockpit with acrylic cover. Engine throttle control with neutral safety switch. 10-gallon fuel tank with baffles and inspection/clean out port. Systems.
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.
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.
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.
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 ).
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
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 ...
Builder: J/Boats, 401-846-8410, www.jboats.com. Displ. 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 hull, and ...
J/100 is seriously different from many other (primarily European) 30-footers. While in Europe a 30-footer is a full-fledged cruising yacht, the J/100 is more of a dassailer. It lacks many usual elements of comfort - for example, a full-fledged galley or a refrigerator, but has a lot of other advantages that are understandable to any sailing yacht.
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.
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.
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.
A self-bailing cockpit, a closed transom for seakeeping safety, lifelines provide comfort and peace-of-mind while sailing offshore. A bona-fide marine head, teak trimmed storage shelves for books and personal gear, and a comfortable interior berthing arrangement define the J/100 as more than just an open-cockpit daysailer.
2005 J Boats J/100. US$94,900. US $749/mo. Larsen Marine Yacht Sales | Waukegan, Illinois. Request Info. New Arrival.
The story begins in 1975. Rod, then an ad salesman for the sailing trade magazine, Soundings, and an active one-design sailor decided to build a sailboat he had been designing since completing a Westlawn School of Yacht Design correspondence course in the 60's. With $400-worth of fiberglass and wood, some rigging and hardware left over from a Soling of Bob's, he built the 24′ x 9′ wide ...
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 ...
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.
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.