Review of J/90
Basic specs..
The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.
Unknown keel type
The boat can only enter major marinas as the draft is about 1.98 - 2.08 meter (6.50 - 6.80 ft) dependent on the load. See immersion rate below.
Sailing characteristics
This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.
What is Theoretical Maximum Hull Speed?
The theoretical maximal speed of a displacement boat of this length is 7.0 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.
The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for J/90 is about 142 kg/cm, alternatively 799 lbs/inch. Meaning: if you load 142 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 799 lbs cargo on the boat it will sink 1 inch.
Sailing statistics
This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.
What is L/B (Length Beam Ratio)?
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 28m 2 (301 ft 2 ). Based on this, your favourite maritime shop can tell you the quantity you need.
Are your sails worn out? You might find your next sail here: Sails for Sale
If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.
| Usage | Length | Diameter | ||
| Mainsail halyard | 28.6 m | (94.0 feet) | 10 mm | (3/8 inch) |
| Jib/genoa halyard | 28.6 m | (94.0 feet) | 10 mm | (3/8 inch) |
| Spinnaker halyard | 28.6 m | (94.0 feet) | 10 mm | (3/8 inch) |
| Jib sheet | 9.1 m | (30.0 feet) | 12 mm | (1/2 inch) |
| Genoa sheet | 9.1 m | (30.0 feet) | 12 mm | (1/2 inch) |
| Mainsheet | 22.9 m | (75.0 feet) | 12 mm | (1/2 inch) |
| Spinnaker sheet | 20.1 m | (66.0 feet) | 12 mm | (1/2 inch) |
| Cunningham | 4.4 m | (14.5 feet) | 10 mm | (3/8 inch) |
| Kickingstrap | 8.8 m | (29.0 feet) | 10 mm | (3/8 inch) |
| Clew-outhaul | 8.8 m | (29.0 feet) | 10 mm | (3/8 inch) |
This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.
Do you have changes/improvements you would like to share? Upload a photo and describe what you have done.
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- Sailboat Guide
2006 J Boats J/90
- Description
Seller's Description
J/90 Combines Handling Ease & Grand-Prix Performance with the stability of a 40 ft. in a super-charged 30 ft. The forgiving hull is shaped for easy control by sailors of all levels.
Equipment: Assembled in 2006 Hall Spars - Carbon Mast, Boom, Sprit, and Tiller Harken Vang and Sail Track Farr Rudder Loads of Racing Sails New Tohatsu 6 hp 4 stroke outboard motor Dock Boat Lift worth $3,000
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)
A single purpose race boat that was only in production for 1 year.
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J/90 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/90. Built by J Boats and designed by Rod Johnstone, the boat was first built in 1997. It has a hull type of Fin w/bulb & spade rudder and LOA is 9.2. Its sail area/displacement ratio 32.35. Its auxiliary power tank, manufactured by undefined, runs on undefined.
J/90 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/90 and decide if it is a fit for your boating needs.
Boat Information
Boat specifications, sail boat calculation, rig and sail specs, contributions, who designed the j/90.
J/90 was designed by Rod Johnstone.
Who builds J/90?
J/90 is built by J Boats.
When was J/90 first built?
J/90 was first built in 1997.
How long is J/90?
J/90 is 8.23 m in length.
What is mast height on J/90?
J/90 has a mast height of 10.93 m.
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J/90 is a 30-foot sailboat that combines handling ease, grand-prix performance and offshore stability. It has a carbon fiber hull, deck, keel, rudder and mast, and a 15' cockpit with a retractable bowsprit.
A boat with a BN of 1.6 or greater is a boat that will be reefed often in offshore cruising. Derek Harvey, "Multihulls for Cruising and Racing", International Marine, Camden, Maine, 1991, states that a BN of 1 is generally accepted as the dividing line between so-called slow and fast multihulls.
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The J/90 epitomizes the new breed. The key to the success of this new breed is reducing weight. The J/90 takes things very much to the limits with a lightweight hull in modern materials fitted with a substantial lead, bronze bulb keel and carbon rig. The result is an impressive 60% ballast ratio and a boat significantly stiffer than those we ...
J/90 is a 30′ 2″ / 9.2 m monohull sailboat designed by Rod Johnstone and built by J Boats between 1997 and 1998. Great choice! Your favorites are temporarily saved for this session.
J/90 Technical specifications & dimensions- including layouts, sailplan and hull profile. SEARCH J/BOATS. Search. Search. Search For: ... About J/Boats History Year by Year Review. The J/ Difference #1 Performance Brand Spritboat Revolution PHRF Ratings. Customer Service Owner Resources
30' Cape Dory 30 -Alberg design cutter rigged Atlantic Highlands Marina, New Jersey Asking $14,000
The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for J/90 is about 142 kg/cm, alternatively 799 lbs/inch. Meaning: if you load 142 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 799 lbs cargo on the boat it will sink 1 inch.
Seller's Description. J/90 Combines Handling Ease & Grand-Prix Performance with the stability of a 40 ft. in a super-charged 30 ft. The forgiving hull is shaped for easy control by sailors of all levels. Equipment: Assembled in 2006 Hall Spars - Carbon Mast, Boom, Sprit, and Tiller Harken Vang and Sail Track Farr Rudder Loads of Racing Sails ...
US$99,000. Bluewater Yacht Sales | Martinsville, Virginia. <. 1. >. * Price displayed is based on today's currency conversion rate of the listed sales price. Boats Group does not guarantee the accuracy of conversion rates and rates may differ than those provided by financial institutions at the time of transaction. J Boats J 9 By Condition ...
Built by J Boats and designed by Rod Johnstone, the boat was first built in 1997. It has a hull type of Fin w/bulb & spade rudder and LOA is 9.2. Its sail area/displacement ratio 32.35. Its auxiliary power tank, manufactured by undefined, runs on undefined. J/90 has retained its value as a result of superior building, a solid reputation, and a ...
SAILING WORLD Magazine's 1998 Boat of the Year. (Atlantic City, NJ)- February 6, 1998. In a gala ceremony held at the Sail Expo Boatshow, the J/90 was crowned the Sportboat of the Year during the prestigious Boat of the Year (BOTY) Awards. Some quotes from the judges: "This boat is well balanced, drives like a dream and has speed to burn."
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J/Boats is the world leader in high-performance sailboats. Designed for cruising, day sailing, offshore racing and one design racing. Rare J/90 Sailing Fast in Florida!
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4.90 ft / 1.49 m: Construction: FG: Ballast Type: Lead: First Built: 2021: Builder: J Boats: Designer: Alan Johnstone: Sailboat Calculations ... Like the LWL, it will vary with the weights of fuel, water, stores and equipment. A boat's actual draft is usually somewhat more than the original designed or advertised draft. For boats with ...
J/9 Specification (Sample equipment list) • Hull and deck molded with biaxial and unidirectional E-glass fabrics and Corecell foam for optimal strength to weight ratio. • High density core inserts used in way of highly loaded hardware. • White gelcoat hull with single boot stripe (in Pelican Grey). • ISO NPG gelcoat and vinylester resin ...
Whether you are buying or selling - we put ourselves in your shoes every step of the way. In addition to new J/Boats, Sail California is proud to represent a multitude of performance and cruising sailboats. If our current inventory doesn't meet your needs, we have access to resources that we will utilize to locate the right boat for you.
J 90 of sailing boat from yard J-Boats. j-90 , 0 , J-Boats , 2.59 , 8.23 , 5240 , J 90 , 1.98 , 9.14 , 844.0 , Sailing boat , 8.23 , j-90 , J-Boats , 5240 , 844.0 , 1 ...
This is the most comfortable J/Boats cockpit ever! One person can sail the J/9 in just minutes. Simply hoist the main and trim the sheet. Thanks to the built-in stability, the sleek hull shape, and the large mainsail, the J/9 is designed to perform better under one sail than other daysailers with two. And when you want an extra burst of speed ...
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The "control" J/Boats used in this comparison are the J/44, J/122, J/35, J/29 (Masthead outboard), J/80, J/92, J/30 and J/24. Assumptions are that: 1. Except where noted as "One Design", each model conforms to all local PHRF definitions of an unmodified "base boat" with a base 155% genoa (depending on local regulations). 2.