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- Sailboat Guide
J/90 is a 30 ′ 2 ″ / 9.2 m monohull sailboat designed by Rod Johnstone and built by J Boats between 1997 and 1998.
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.
Member Boats at HarborMoor
The J90 is a 30.2ft fractional sloop designed by Johnstone and built in fiberglass by J Boats between 1997 and 1998.
5 units have been built..
The J90 is an ultralight sailboat which is a very high performer. It is very stable / stiff and has a low righting capability if capsized. It is best suited as a racing boat.
J90 for sale elsewhere on the web:
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J/Boats Unveils The Sleek New 28-footer “J/9”
Responding to a growing need amongst sailors for a comfortable, simple and easy-to-own daysailer, J/Boats announces a sleek new 28 footer (the “J/9”) with one of the most comfortable cockpit and easiest-to-manage sailplan in this size range.
“ With the J/9, we set out to reimagine how to make sailing easier, more relaxing and more inclusive, ” said Jeff Johnstone of J/Boats . “ This is a boat you can sail by yourself in just a few minutes, or bring along the whole gang with plenty of room to spare. Escaping to the water and enjoying shared family adventure has never been more important, and the J/9 is the perfect platform. ”
The J/9 cockpit has four corner seats to nestle into and enjoy the day. With friends and family aboard , everyone can find the perfect place to relax. A swim platform behind the cockpit allows walk-through boarding, and on those downwind sails home, you can cool off by dragging your feet in the water.
Sailing the J/9 is as easy as hoisting the mainsail and trimming the sheet. Why make it any more complicated? Look around on the water and you’ll notice 80% of the sailboats are sailing with only one sail. The answer is keep it simple! One tiller, one sheet.
The big difference with the J/9 is you will be sailing with one sail more comfortably and quicker than most others with two sails or under motor. Ready for the afterburners? Simply unroll the jib and enjoy effortless, stable & smooth sailing from the comforts of the best J/Boats cockpit ever.
The plan is for the first J/9 to launch in Spring 2021.
LOA 28 ft – 8,54 m LWL 25.4 ft – 7,75 m Beam 8.6 ft – 2,63 m Standard draft 4.9 ft – 1,5 m Shoal draft 3.9 ft – 1,19 m Displacement 4.25 lbs – 1.927 kg J/Boats Website
7 Wonderful Cities to Live on a Sailboat
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The 7/8 fractional rig is designed for a sail inventory of mainsail, 150% genoa, 100% jib, large running and small reaching asymmetric spinnaker - both flown from the masthead. Rigging and control systems are simple and sophisticated. The interior, while simple, is functional, with sleeping space for two people on mid-ship pipe berths.
A boat's actual draft is usually somewhat more than the original designed or advertised draft. For boats with adjustable keels (centerboards, daggerboards, lifting and swing keels), Draft (max) is with the board down. Draft (min) is with the board up. DISPLACEMENT: If you weigh the boat on a scale, that is her actual displacement. It is the ...
1998 J Boats J/90. US$69,000. ↓ Price Drop. Sail California | Tiburon, California. Request Info. <. 1. >. * Price displayed is based on today's currency conversion rate of the listed sales price.
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 ...
Description. 1998 J Boats J/90. The J/90 weighs in at 3,100 lbs. on a 27.0 foot waterline. The result is one of the lightest sailboats of her size with a displacement/length ratio of 70. Her high power to weight ratios, both upwind and down, will get you a turbo-charged ride with all the stability of a 40 footer!
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. Formula. D/L = (D ÷ 2240) ÷ (0.01 x LWL)³ D: Displacement of the boat in pounds. LWL: Waterline length in feet
1 of 2. 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.
Sure enough, coming around Fort Adams with long-time J/boats designer Al Johnstone and SAIL's managing editor, Lydia Mullan, aboard we immediately started rocketing across Narragansett Bay with a solid 20 knots of wind gusting to 25 and more.The J/9, though, couldn't have been happier. Better still, Al expressly designed the boat to handle as well under main alone as under main and jib ...
Responding to a growing need amongst sailors for a more comfortable, simpler and easy-to-own daysailer, J/Boats is excited to announce a sleek new 28-footer (the "J/9") with perhaps the most ...
This Lake Pend Oreille Yacht Club sailboat race used an "inverted start", where each boat starts individually, depending on their handicap. The slowest boats...
New J Boats J 9 3 listings. Find J Boats J 9 boats for sale in your area & across the world on YachtWorld. Offering the best selection of J Boats to choose from.
The J90 is a 30.2ft fractional sloop designed by Johnstone and built in fiberglass by J Boats between 1997 and 1998. 5 units have been built. The J90 is an ultralight sailboat which is a very high performer. It is very stable / stiff and has a low righting capability if capsized. It is best suited as a racing boat.
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 ...
Responding to a growing need amongst sailors for a comfortable, simple and easy-to-own daysailer, J/Boats announces a sleek new 28 footer (the "J/9") with one of the most comfortable cockpit and easiest-to-manage sailplan in this size range. "With the J/9, we set out to reimagine how to make sailing easier, more relaxing and more inclusive," said Jeff Johnstone of J/Boats.
The 1999 J J90 sailboat has a fiberglass hull and has an overall length of 30 feet (sometimes referred to as LOA). The width (or beam) of this craft is 85 inches. This boat is rigged as a Sloop. The sail area for the sailboat is 600 square feet. The displacement for the boat is approximately 3100 lbs.
J/Boats is the world leader in high-performance sailboats- designed for cruising, day sailing, offshore racing, one-design racing. ... Some other unique J90 features include: A carbon reinforced rudder blade - with carbon post, tiller, and Harken bearings - designed for all-around steering efficiency at any speed; deck hardware and running and ...
J Boats for sale on YachtWorld are offered at a range of prices from $4,637 on the lower-cost segment, with costs up to $469,781 for the most expensive, custom yachts. What J Boats model is the best? Some of the best-known J Boats models currently listed include: J/105, J/109, J/112E, J/99 and J/100. Specialized yacht brokers, dealers, and ...
J/99 - Fast, Fun Offshore Speedster. The J/99 (32.6') does it all - combining great sailing performance and stability with belowdecks comfort in a boat that can be sailed by just one or two people. The deck layout and sailplan are optimized for easy handling, while the roomy cockpit accommodates 8+ for fun daysailing.
Have you heard about the newest offering from JBoats: The J9? She's said to have THE MOST comfortable cockpit EVER... Hop aboard with professional Yacht Brok...
Find J Boats J 99 boats for sale in your area & across the world on YachtWorld. Offering the best selection of J Boats to choose from.