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  • Sailboat Guide

J/30 is a 29 ′ 9 ″ / 9.1 m monohull sailboat designed by Rod Johnstone and built by J Boats between 1979 and 1986.

Drawing of J/30

  • 2 / 11 New Bedford, MA, US 1979 J/30 $17,000 USD View
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  • 11 / 11 New Bedford, MA, US 1978 J/30 $17,000 USD View

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)

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1979 J-Boat J-30 cover photo

  • About Sailboat Guide

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The J30 is a 29.83ft fractional sloop designed by Johnstone and built in fiberglass by J Boats between 1979 and 1986.

554 units have been built..

The J30 is a moderate weight sailboat which is a good performer. It is stable / stiff and has a low righting capability if capsized. It is best suited as a day-boat.

J30 sailboat under sail

J30 for sale elsewhere on the web:

j30 sailboat specs

Main features

Model J30
Length 29.83 ft
Beam 11.18 ft
Draft 5.25 ft
Country United states (North America)
Estimated price $ 0 ??

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j30 sailboat specs

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Sail area / displ. 19.47
Ballast / displ. 30 %
Displ. / length 200
Comfort ratio 16.42
Capsize 2.34
Hull type Monohull fin keel with transom hung rudder
Construction Fiberglass
Waterline length 25 ft
Maximum draft 5.25 ft
Displacement 7000 lbs
Ballast 2100 lbs
Hull speed 6.70 knots

j30 sailboat specs

We help you build your own hydraulic steering system - Lecomble & Schmitt

Rigging Fractional Sloop
Sail area (100%) 444 sq.ft
Air draft 0 ft ??
Sail area fore 196.59 sq.ft
Sail area main 247 sq.ft
I 34.19 ft
J 11.50 ft
P 38 ft
E 13 ft
Nb engines 1
Total power 15 HP
Fuel capacity 0 gals

Accommodations

Water capacity 0 gals
Headroom 0 ft
Nb of cabins 0
Nb of berths 0
Nb heads 0

Builder data

Builder J Boats
Designer Johnstone
First built 1979
Last built 1986
Number built 554

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j30 sailboat specs

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j30 sailboat specs

Designed by Rod Johnstone in 1978, the J/30 was in production from 1979 through 1986, with 545 hulls built. The average selling price is $28,000. It takes a crew of seven to race the boat.

The J/30 is noted for heavy-air performance. It holds its own in moderate and light air as well, but really excels when it’s windier. The boat has several cruising amenities (standing headroom, enclosed head, large icebox, and hot water) for those who want to dual-purpose.

Many J/30s suffer from core rot due to water penetration around the chainplates, which could cost as much as $3,000 to professionally repair. New laminated racing sails should be approximately $9,000, but one-design class rules stipulate a Dacron main, reducing the cost.

J/30 http://www.J30.org Typical monthly costs: $852 Annual budget range: $2,000 to $12,000 PHRF 135 to 144 LOA 29’11” LWL 25′ Beam 11’2″ Draft 5’3″ Disp. 6,700 lbs. SA 460 sq. ft.

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j30 sailboat specs

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1979 J Boats J/30 Technical Specs

General data about j boats j/30.

Brand
Model
Boat Type
Category
Year Of Production
Condition (New/Used)
Country
Fuel (Gas/Diesel)
Hull Material Used
Length
Selling Price

Engine and Power Specs

Engine manufacturer
Engine Location

Dimensions And Wieght

Sailing Area
Main Sailing Vessel
LOA (Length Overall)
L.W.L(Length WaterLine)
Full Sail Area
Displacement (Weight)
Boat Maximum Draft
Beam Width
Ballast System Weight

Detailed Specifications

Number of Heads (Watercraft)

Features And Equipments

Interior specifications.

Hand bilge pump
Automatic bilge pump

Electronical And Electrical Info

Shore power socket

Deck Hardware

Tiller

J Boats J/30

J Boats J/30 tv detailed specifications and features

More J/30 models

  • J Boats provided us with the latest version of its J/30 service repair manual
  • Find All mechanical and electrical parts and accessories of J Boats J/30 Sail here

J Boats J/30 competitors

Custom Kalon 28 Technical Data

  • Dealerships

Every detail about the J-30 has been engineered for exploration – designed to take you wherever you want to go.

j30 sailboat specs

Explore the design of the J-30 BLACK VISION, a finely-tuned balance of form and function.

j30 sailboat specs

Distinctive looks

The design of JAKTAR J-30 BLACK VISION does more than just stand out from the crowd: we set our own course, and head for uncharted waters. The result is an uncompromising boat, with every element tuned for stability and performance in all conditions.

j30 sailboat specs

Every detail considered

The interior of the J-30 BLACK VISION is designed with scrupulous attention to detail.

Exceptional engineering

j30 sailboat specs

Capabilities

See what’s possible with the J-30 BLACK VISION: built for speed, stability, and high load capacity.

j30 sailboat specs

Built for speed

The J-30 has a unique hull shape designed for performance at high speed. We started with strengthened aluminum, and finely tuned the boat’s center of gravity for optimum performance at speeds of up to 50 knots.

j30 sailboat specs

Stable in rough conditions

The unique hull of the J-30 gives the boat stability, no matter the wave direction. So you can stay comfortable, whichever way the waves roll.

j30 sailboat specs

High load capacity

Designed with plenty of storage space and a high load capacity, you can store enough gear, food and water supplies onboard the J-30 for multi-day off-grid adventures. All without compromising the balance of the boat – or its performance.

j30 sailboat specs

Versatility

From a few hours’ boating in high summer to a multi-day expedition into the winter wilderness, the J-30 is designed for a whole range of activities and lifestyles.

Deep sides for safe fishing

The J-30’s aft cockpit has waist-deep sides and plenty of space for spinning rods – keeping you stable and secure while you catch your dinner.

Easy to cook any food

Being on an adventure doesn’t mean you can’t make good food. The J-30’s fully-equipped kitchen space means you can cook a freshly-caught fish, serve it with a cold glass of wine, and reflect on the day’s adventure.

j30 sailboat specs

Take it anywhere

A reinforced hull and low height makes the J-30 as happy dropping anchor in hidden coves as it is gliding under bridges on its way into the marina. It fits on a trailer too, so you can tow it to any forgotten corner of the map that catches your eye.

Add any gear

Fix kayaks or mountain bikes to the roof. Store all your fishing gear. Stow solar batteries for extra power. The J-30’s aluminum construction makes it endlessly adaptable – bolt things on, strip things out, do whatever you need for the adventure.

Just open the smart door to head off to the bow

The front gas-lifted door allows you to easily go to the bow area whenever you need, would it be loading or unloading your gear or quick disembarking to explore a wild white sand beach.

j30 sailboat specs

The J-30 is built to endure, using marine-grade aluminum and anti-corrosion paint that will last for years to come.

Fully-welded aluminum

The J-30 is built from fully-welded marine-grade aluminum, for the ideal balance of strength and low weight. Every weld is carefully engineered to give the J-30 an exceptionally strong hull, while keeping the weight as low as possible.

j30 sailboat specs

Vertical sides

The J-30’s vertical sides give it excellent stability and improved handling in all conditions.

j30 sailboat specs

Anti-corrosion paint

Most aluminum boats are unpainted, which leaves them exposed to the elements. We use high-quality ocean-ready paint to reduce corrosion, and keep the boat looking good as new for decades to come.

j30 sailboat specs

With enough space to sleep 4 people, plus a hot shower and a kitchen space to keep everyone happy and fed.

Cozy space for four

The J-30 will happily sleep four people in deep comfort – with beds and storage enough for a multi-day trip.

j30 sailboat specs

Hot showers included

The J-30 has a proper loo and a hot shower. So you can stay comfortable, even in the wild.

j30 sailboat specs

Space to cook

Home Stylish galley Find in galley option everything you could only dream of cooking onboard: would it be a lovely dinner or morning espresso! Two storage compartments are ready to keep your lovely cookware. A spacious stainless steel uploading fridge will always keep your food and drink chilled and fresh. "A sink with a smart telescope faucet and gas stow gently covered with the meganite flat lids" making up a comfortable working surface.

j30 sailboat specs

Safety on the water is essential: the J-30 comes with grab rails everywhere you need them, and all the safety kit you’d expect.

j30 sailboat specs

The aft cockpit has deep sides, to keep everyone in the boat whatever the sea is doing.

j30 sailboat specs

Heavy duty grab rails

Welded aluminum grab rails mean you can always get a firm grip as you move around the boat.

j30 sailboat specs

Angles of safety

The J-30 has a vanishing stability point of 70 degrees – making it extremely difficult to capsize.

j30 sailboat specs

Design details

Carefully considered features for a better experience on board.

Spacious aft cockpit

There’s plenty of room in the aft cockpit for everyone to move around safely – and the boat’s center of gravity keeps it stable, no matter where your passengers are in the boat.

j30 sailboat specs

Panoramic visibility

Get exceptional visibility from the cockpit, with panoramic glassing that makes it easy to see in all directions. Essential when you’re navigating the backwaters of the Far North.

j30 sailboat specs

Easy access to the bow deck

Push a button and Jaktar’s gas-springed wing door opens from the cockpit to the bow deck – making it easy to load and unload your gear in wild places without a pier.

Technical data

Overall length (excl. Engine)

Weight (excl. Engine)

Fuel capacity

Deadrise (stern/bow)

Classification

Max speed range

Outboard engines

2х225–2х400 hp

j30 sailboat specs

Standard equipment

Full reverse chine bottom design

Welded offshore motor bracket with integral bottom sheet & full width swim platform

Ventilation System

Long and spacious under floor storage

Roof black painted welded rails

Side sofas with storage compartment option

Back To Highlights

General Features

Front cabin, helm station, electric and electronic systems, safety and comfort.

j30 sailboat specs

Extra equipment

Atlas II Radar mast

Audio system

Ergo style kitchen module

Full size head

Flush mounted compact 16L freezer/fridge

MORE EQUIPMENT

j30 sailboat specs

• Audio Entertainment system, incl. 4 x speakers • Control Unit For Fusion System

j30 sailboat specs

Navigation System

• Chartplotter Twin RAYMARINE AXIOM RV 12 • Echo sounder, bottom scanner • RAYMARINE Radar Quantum II • Raymarine VHF

j30 sailboat specs

More Equipment

• Cockpit shelf led lights. (Storage compartments led lights) • LED ambient lights, pilothouse • Underwater lights • LED search light w. remote control • LED aft cockpit flood light

j30 sailboat specs

Pre-rigging

• Twin Mercury Verado V8 with power steering, Activ Trim and VesselView link smart craft features

Bow thruster Side-Power SE40 w.joystick control

j30 sailboat specs

Aft cockpit folding 2х bench set with removable table

Other options

• Windlass • 1000 stainless 60w/AFT installation • DELTA style stainless anchor • Stainless roller • 30 meters of chain • Front boarding ladder • 280 AH Service battery • Two 100 Ah engine batteries • 100 Ah bow thruster battery • Shore Power 230V with 40Ah charger • 20L 12/220 volt insulated hot water boiler • Automatic pressure pump • Allows to have hot water in the kitchen module or/and shower • Livewell in the aft storage • Cushions for aft bench with back rests • Fishing rod holders

j30 sailboat specs

• Fishing rod holders

ATLAS II Radar mast with folding system

j30 sailboat specs

• 70 liter stainless uploading Vitrifrigo fridge. • Elca designed a hot/cold water sliding faucet. • Stainless steel sink. • CAN black glass surface designed one burner gas stove. • Big sliding drawer for cookware. Small fork/spoons drawer

j30 sailboat specs

Windlass option

• Windlass • 1000 stainless 60w/AFT installation • DELTA style stainless anchor • Stainless roller • 30 meters of chain • Front boarding ladder

j30 sailboat specs

Aft cockpit folding 2х bench set

Removable table with the telescopic leg

Cushion for aft bench with back rests

j30 sailboat specs

Livewell in the aft storage

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  • Thread starter shemandr
  • Start date Nov 23, 2015
  • Forums for All Owners
  • Ask All Sailors

shemandr

I'm looking for info re this boat. I've done the sailboatdata.com, and google and the class association. I'm looking for tips for survey, performance info from anyone who has owned one or raced one - either on board or against one. Basically, I considering this for a Wed. Pm and club level PHRF racing for limited crew. Our regular Wed Pm breeze is 15- 18 knots. I would keep the jib on a furler and am considering using just the 105% as a working sail. Most of the sailing would be the admiral and I. No apes on the rail. We also would like to do overnights at a local anchorage. Nothing long distance. I know J 24's, 22's, 27's and 29's but I don't know much about the 30. What does anyone think?  

Jackdaw

It's hard not to look at the 30 and see a big J24. Indeed it was designed right after the 24. Its a very decent boat; quick for sure. Will absolutely CRUSH any of its contemporaries in the 29-31 foot range that were coming out at the same time. (C&C, Bristol, Cal, etc) you name it. Only the Olson 30 is close. The boat is a bit tender but OK with a jib. Two can handle it easily that way. Fractional rig helps the 2-up part as well. Just play the main and all is golden. Hopefully your PHRF board will give you some credit for the jib and the furler. Racing? Limited (spin) crew means 5. Cruising fine. I think it has a 1-cyl diesel and is LOUD downstairs. No anchor locker on deck IIRC. Headroom is low, and tankage is small for a cruiser. But thats fixable. The whole thing is cored so look hard for wetness. Look for signs of strain from the rigging. Most have been sailed HARD.  

Ted

The J30 is a very nice boat. It was on my short list when I was looking to purchase a boat in the 30 foot size range. I crewed on one years ago and am pretty familiar with it. Ultimately I decided against buying one because it had to be sailed very flat to be competitive and I knew that I wouldn't have the crew weight to do that. My sailing area typically has wind speeds in the 15 knot range. The boat also developed a lot of weather helm as she heeled, primarily because of the wide beam. They are very fast down wind in a blow but struggle in light air and chop. Specific areas to check on the J30 are the structural supports for the engine mounts and the fiberglass floor around the mast step. The hull and deck are balsa cored so a moisture check should be done. I'd be surprised if they come up dry as almost all boats with this type of construction have some issues. It's just a matter of how widespread it is. There were two cockpit disigns over the years. The earlier models had cockpits which were similar to the J24 with almost no coaming. The later models had coamings which helped keep water out of the cockpit.  

Jackdaw, They came with a Yanmar 2GM 2 cylinder diesel. The anchor locker is on the starboard side near the chain plate. A Danforth type anchor can be stored vertically. It's easy to miss because the locker lid is narrow and doesn't look like a typical anchor locker especially because of its location.  

Ted said: The anchor locker is on the starboard side near the chain plate. A Danforth type anchor can be stored vertically. It's easy to miss because the locker lid is narrow and doesn't look like a typical anchor locker especially because of its location. Click to expand

I appreciate the responses. I'll probably take a look at it. I'm a little concerned about the draft which is a bit over what's considered max around here. I'll see if the condition is good enough to worry about that.  

The J30 has been popular in my club for the past 20 or more years. There are 2 deck versions, the older version does not have backrests in the cockpit the newer version does. They do like to be sailed flat. The transom hung rudder can develop some weather helm and in heavier conditions it is not well balanced so it takes more effort to steer. As others have noted, the entire boat is balsa cored, so watch out for wet core or the price should reflect the wet coring. Head room is just under 6'. The interior is comfortable for short term cruising, a week or two, not a boat that I would want to live aboard. The One Design J30 has a longer spin pole than PHRF allows, so you pay a rating penalty. Some boats have had problems with wet transoms. Here's a link to the J30 Class Association: http://j30.us/blog/  

DL, Maybe you can confirm for me that the 163 is the class jib? I was looking on the Class Association site and that seems to be the case. I didn't find the class rules or a link to such.  

Here's link to the class rules. Paragraph 5.12.5.1 describes the allowable limits of the #1 Genoa's LP. ' Its been a few years since I raced on J30, but I think the class mostly uses 155% genoas. We always referred to them by number, 1, 2, or 3. Edit: forgot to paste the link! http://j30.us/j30.org/public_html/html/technical/J30-2013-Class-Rules-only.pdf  

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10/16/20 09:12 AM
10/16/20 09:12 AM
Joined: Jul 2004
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J30.us
 
J30.us
Joined: Jul 2004
Posts: 868


I will add 10 mm specs next. Any information to share would be awesome.

David Erwin
West Marine Affiliate Program

The J/30 Class Association has partnered with West Marine and is now a member of the West Marine affiliate program. You can support the J/30 Class when you make your West Marine purchases online. The J/30 Class Association receives a percentage of sales from your purchases when you click through from our website. Click the logo above and you will be directed to the West Marine website with a cookie that identifies you as a J/30 affiliate. You can also use any discounts that you may be authorized.
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    J30 Official Specifications

  5. J/30

    Introduced in 1979, the aim was to build a boat that would be comfortable for a family to cruise or daysail without compromising speed and performance. By striking this balance, the J/30 is a competitive racer that can be comfortably handled by sailors of all age and experience levels. The J/30 ceased production with hull number 545, built in 1986.

  6. J/30

    J/30 is a 29′ 9″ / 9.1 m monohull sailboat designed by Rod Johnstone and built by J Boats between 1979 and 1986.

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    The J30 is a 29.83ft fractional sloop designed by Johnstone and built in fiberglass by J Boats between 1979 and 1986. J30 detailed characteristics and performance ratios.

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    Joe Comeau. Designed by Rod Johnstone in 1978, the J/30 was in production from 1979 through 1986, with 545 hulls built. The average selling price is $28,000. It takes a crew of seven to race the ...

  9. J/30 Sailing Review

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    J/30 Detailed Review. 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/30. Built by J Boats and designed by Rod Johnstone, the boat was first built in 1979. It has a hull type of Fin w/transom hung rudder and LOA is 9.09.

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    J/30 Used Boat Review. In the late seventies opportunity knocked at boat builders' doors. It was calling for an offshore one-design boat that would offer high performance at an affordable price. Most major manufacturers of the day heeded the call. C & C Yachts introduced the Mega 30. Tartan Marine offered the Tartan Ten.

  13. J30

    J-30 Every detail about the J-30 has been engineered for exploration - designed to take you wherever you want to go. Extra Equipment Overview Standard Equipment Technical Data Design Design Explore the design of the J-30 BLACK VISION, a finely-tuned balance of form and function. Learn More Distinctive looks The design of JAKTAR J-30 BLACK...

  14. J-30

    The J30 is a very nice boat. It was on my short list when I was looking to purchase a boat in the 30 foot size range. I crewed on one years ago and am pretty familiar with it. Ultimately I decided against buying one because it had to be sailed very flat to be competitive and I knew that I wouldn't have the crew weight to do that.

  15. J30

    J/Boats is the world leader in high-performance sailboats- designed for cruising, day sailing, offshore racing, one-design racing.

  16. By-laws, Rules, Specifications

    All boats shall be built in accordance with the plans, specifications and these class rules. No alternatives or modifications are permitted unless explicitly stated in these rules or on the official plans or building specifications.

  17. J/30 Class Association

    J/30 Districts. Discussions relevant to specific J/30 Districts as listed in the Class Association By-laws. Forums. Threads. Posts. Last Post. California District. Discussion for subjects unique to Arizona and California. Last Post 01/11/13 01:39 AM, by alx.

  18. J Boats J 30 boats for sale

    Find J Boats J 30 boats for sale in your area & across the world on YachtWorld. Offering the best selection of J Boats to choose from.

  19. Tech Specs

    J/24 Technical specifications & dimensions- including layouts, sailplan and hull profile.

  20. Official Specifications

    Copyright © 2024 J30.org - All Rights Reserved Powered by WordPress & Atahualpa

  21. J/30 Fastnet Storm

    J/Boats is the world leader in high-performance sailboats- designed for cruising, day sailing, offshore racing, one-design racing.

  22. J/30 Class Association

    J/30 Class Association Sort by: 1 Sailboats / Per Page: 25 / Page: 1

  23. Bayesian yacht: What we know about the luxury boat sank by a ...

    Emergency workers in southern Italy are still hunting for six people missing after a tornado sank a luxury yacht early Monday - prompting an air and naval operation off the coast of Sicily.

  24. Halyard + Sheet Guide

    J30.us. Joined: Jul 2004. Posts: 868. New Orleans, LA, USA. I wanted to put together a standard halyard and sheet guide for the class. Please forgive if this already exists. I have lenghts (except for Spinnaker sheets). http:/ / j30.us/ Zephyr/ J30HalyardSheetGuide.xlsx. I will add 10 mm specs next.