• Newsletters
  • Sailboat Reviews
  • Boating Safety
  • Sailing Totem
  • Charter Resources
  • Destinations
  • Galley Recipes
  • Living Aboard
  • Sails and Rigging
  • Maintenance
  • Best Marine Electronics & Technology
  • By John Burnham
  • Updated: January 31, 2007

Known both for racers and performance cruisers, J/Boats Inc. successfully launched its hot-looking daysailer, the J/100, a couple of years back. That model’s new sister, the J/124, is just that much larger that you can daysail it, race it, and take it on a coastwise cruise. It’s a technically advanced boat, and its set-back headstay and pulpit give it a modestly aggressive look to go with its carbon-fiber rudder and Hall Spars mast. However, for a nontechnical crew of 10 toting hors d’oeuvres, two guitars, and a banjo one evening last summer, the extra-large cockpit measured up best in our test sail.

Steering with the 54-inch carbon wheel, I found the sloop tracked easily upwind, with the mainsail controls conveniently at hand. The split mainsheet leads under the deck to winches just forward of the helm, and the traveler, on the cockpit sole, is easily managed. But the surprise about the J/124 is below, a space that makes it easy to imagine taking a pleasant week’s cruise on board this boat. There’s an aft head to starboard, a simple galley, a stand-up chart table, long straight settees, and modest forward and aft cabins. Major storage areas are aft lazarettes and a huge starboard cockpit locker that can be opened from the head as well. The boat’s principal limitations are tankage, the galley size, 6 feet of headroom, and a fairly high price tag. Plus, to cruise much, one would add such options as a removable bow anchor roller, a varnished teak table for cockpit or below, DC refrigeration, and a hot-water system. In any case, as a sweet-sailing performer for daysailing or weekending, the 124 hits its marks well.

J/124 Specs

LOA: 40′ 8″ LWL: 36′ 2″ Beam: 11′ 4″ Draft (deep): 6′ 10″ Sail Area: 754 sq. ft. Displacement (deep): 12,600 lb. Water: 35 gal. Fuel: 25 gal. Engine: 40-hp. Yanmar Designer: Rod Johnstone Price: $420,000 J/Boats Inc., (401) 846-8410, www.jboats.com

  • More: 2001 - 2010 , 31 - 40 ft , Bluewater Cruising , J/Boats , keelboat , monohull , racer / cruiser , Sailboat Reviews , Sailboats
  • More Sailboats

New to the Fleet: Pegasus Yachts 50

Balance 442 “lasai” set to debut, sailboat review: tartan 455, meet the bali 5.8, cruising the northwest passage, a legendary sail, 10 best sailing movies of all time.

  • Digital Edition
  • Customer Service
  • Privacy Policy
  • Email Newsletters
  • Cruising World
  • Sailing World
  • Salt Water Sportsman
  • Sport Fishing
  • Wakeboarding

The J124 is a 40.7ft fractional sloop designed by R. Johnstone and built in fiberglass by J Boats between 2002 and 2007.

35 units have been built..

The J124 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 fast cruiser. The fuel capacity is originally small. There is a very short water supply range.

J124 sailboat under sail

J124 for sale elsewhere on the web:

j124 sailboat

Main features

Login or register to personnalize this screen.

You will be able to pin external links of your choice.

j124 sailboat

See how Sailboatlab works in video

j124 sailboat

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


Builder data, other photos, modal title.

The content of your modal.

Personalize your sailboat data sheet

Great choice! Your favorites are temporarily saved for this session. Sign in to save them permanently, access them on any device, and receive relevant alerts.

  • Sailboat Guide

J/124 is a 40 ′ 8 ″ / 12.4 m monohull sailboat designed by Rod Johnstone and built by J Boats between 2002 and 2007.

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)

Embed this page on your own website by copying and pasting this code.

  • About Sailboat Guide

©2024 Sea Time Tech, LLC

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Weather Forecast

2:00 pm, 06/12: -11°C - Partly Cloudy

2:00 am, 07/12: -4°C - Clear

2:00 pm, 07/12: -7°C - Partly Cloudy

2:00 am, 08/12: -3°C - Overcast

  • Cruising Compass
  • Multihulls Today
  • Advertising & Rates
  • Author Guidelines

Blue Water Sailing

British Builder Southerly Yachts Saved by New Owners

j124 sailboat

Introducing the New Twin-Keel, Deck Saloon Sirius 40DS

j124 sailboat

New 2024 Bavaria C50 Tour with Yacht Broker Ian Van Tuyl

j124 sailboat

Annapolis Sailboat Show 2023: 19 New Multihulls Previewed

j124 sailboat

2023 Newport International Boat Show Starts Today

j124 sailboat

Notes From the Annapolis Sailboat Show 2022

j124 sailboat

Energy Afloat: Lithium, Solar and Wind Are the Perfect Combination

j124 sailboat

Anatomy of a Tragedy at Sea

j124 sailboat

What if a Sailboat Hits a Whale?!?

j124 sailboat

Update on the Bitter End Yacht Club, Virgin Gorda, BVI

j124 sailboat

Charter in Puerto Rico. Enjoy Amazing Food, Music and Culture

j124 sailboat

With Charter Season Ahead, What’s Up in the BVI?

j124 sailboat

AIS Mystery: Ships Displaced and Strangely Circling

j124 sailboat

Holiday Sales. Garmin Marine Stuff up to 20% Off

  • Boat Reviews


Building upon the successful J/100, the larger J/124 is almost 41 feet long and mimics the aesthetics of its smaller sister. With the J/124, J/Boats sought to create a high-end daysailer and weekender that is fast yet simple. While they pushed the envelope on performance, they wanted to keep it simple enough to singlehand, evidenced by the optional self-tacking jib and absent spinnaker gear. And high-end she is with a SA/D of 22 placing her well in the performance racing spectrum as well as a list of carbon fiber accessories keeping her light and allotting a D/L of 119. The relatively narrow, V’d hull, nearly-plumb bow and low sheer give the J/124 a sleek appearance.

Author: Blue Water Sailing

Leave a reply cancel reply.

J/124 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/124. Built by J Boats and designed by Rod Johnstone, the boat was first built in 2002. It has a hull type of Fin w/bulb & spade rudder and LOA is 12.41. Its sail area/displacement ratio 22.36. Its auxiliary power tank, manufactured by Yanmar, runs on Diesel.

J/124 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/124 and decide if it is a fit for your boating needs.

Boat Information

Boat specifications, sail boat calculation, rig and sail specs, auxillary power tank, accomodations, contributions, who designed the j/124.

J/124 was designed by Rod Johnstone.

Who builds J/124?

J/124 is built by J Boats.

When was J/124 first built?

J/124 was first built in 2002.

How long is J/124?

J/124 is 11.03 m in length.

What is mast height on J/124?

J/124 has a mast height of 14.75 m.

Member Boats at HarborMoor

j124 sailboat

  • J/Boats Home
  • Brokerage Listings

j124 sailboat

From its large carbon wheel to the fine cherry and teak joiner work and Ultra-Suede upholstery below, or simply by the smooth, graceful way it slides through the water, the J/124 is every bit a sailing yacht in the best sense of the word. One that is a joy to sail in all conditions with minimal crew and with rare need to employ the auxiliary diesel engine.” ~ J/124 Brochure Sea Loft is one owner yacht and a rare find. She is in like new condition, exceptionally well equipped and maintained to a discerning standard. In indoor heated storage for the season, other than re commissioning this boat needs nothing. Come take a look, you will not be disappointed.

Make or Manufacturer

Length overall, fuel capacity, water capacity.

j124 sailboat

Hull and Deck

Dodger and fold-up Bimini for all-weather protection Sunbrella Wheel cover (Navy) Sunbrella (navy) Custom made Integrated Cockpit Tent enclosure (expands the enclosed area to 12' by 100 sq. ft) Large 12' Cockpit (seating for 8 people) made secure with 14” high backrests and seats that are long enough to sleep on. New Full set of cushions for cockpit area for increased comfort both underway and at anchorage Fiberglass hull & decks; white gel coat hull, blue boot stripe, light gray/buff nonskid decks. Newly painted ablative bottom paint Exterior Hull newly waxed Solid Teak port and starboard toe rails (varnished) Light & ventilation provided by 3 hatches, 3 opening ports with Screens Teak and Holly cockpit sole Fin keel w/bulb -Spade rudder (brand new bearings installed) Bow & stern pulpits Double lifelines Port, starboard, stern boarding gates Port & starboard seat lockers Large starboard Lazarette locker for holding gear, lines etc. Stern-mounted swim ladder/with fresh water wash down S.S. Fender Holders (Starboard and Port) Muir Windless Atlantic Series anchoring system with (bow activated footswitches) Quick Chain Counter and remote operation of windless: hand-held activation from the cockpit Anchor w/250' of anchor chain with 150' of anchor rode Aft Fortress Stern Anchor with rode Entertain and relax after a long day of sailing at this folding teak cockpit table w/pedestal stand

Deck Hardware

Rail: S.S. lifelines with port and starboard fast release pelican hook access points Cleats: S.S. stern, midship (port/starboard) double S.S. bow cleats Windless: Muir windless with deck and remote handheld helm control Bow chalks: S.S. chalks Ensign: Custom teak staff (varnished) with U.S. flag & S.S.socket Lights: USCG approved running, steam and anchor lights Hatch: Lewmar, opening with screen Portlights: (2) Lewmar pad eyes (1) port and (1) starboard Fills: S.S. water, fuel and waste Wash down: Saltwater washdown with hose with separate water pump located at bow in anchor locker Washdown: Stern fresh water/shower Radar Post (powder coated –white)port side Teak toe rails (varnished)

Edson Pedestal Steering System with Lewmar carbon Y-Spoke wheel- 55" diameter Emergency tiller Bosworth high capacity Guzzler Diaphram manual pump controlled from the cockpit Water temperature, oil pressure, amp/volt alarms NEW full wrap around cockpit seating Custom Sunbrella cover for Helm station and Carbon Wheel Ritchie compass mounted in front of helm station Hot and Cold pressure shower on Transom Self-bailing cockpit and guttered steering well Full LED lighting throughout the cockpit and companion stairway

Sails and Rigging

Rigging Type - Fractional Sloop S.S. Rod rigging Maine Sailing Partners fully Batten Mainsail for Leisure Furl compatibility Maine Sailing Partners 100% fore triangle jib Maine Sailing Partners asymmetrical spinnaker Sailtec backstay hydraulic adjuster w/gauge Forespar Leisure Furl system with a rigid boom vang and boom topping lift for ease in furling and storing sail in the boom Roll Gen Harken furling and reefing system 6 - Lewmar winches include self-tailing primaries, self-tailing secondary, 3 - Lewmar Ocean Electric Winches (main halyard and 2 -genoa winches) 4 - Winch handles Split mainsheet leads go under the deck to winches just forward of the helm, and the Harken Traveler, on the cockpit sole


All instruments have been updated each year with the newest software!

Helm mounted Ritchie Globe Master Compass Dual Band Cellular Amplifier. Antenna mounted on the radar mast improving mobile coverage Raymarine E-Series E120 Chart Plotter (15") Located in cockpit located port side bulkhead Raymarine E80 Chart Plotter (11") helm mounted chart plotter Raymarine AIS500 Transceiver: Automatic Identification System for monitoring all shipping traffic directly from chart plotters Raymarine Weather Module: Real-time monitoring and updates on weather forecasts and weather systems and threats directly from the E120/80 chart plotters Edson Stainless Steel mount for attaching portable a GPS handheld unit at the helm station w/DC power connection Raymarine ST290 instrument System (located at companionway) facilitates the operation of sailing vessels. Data is provided by a range of transducers and displayed on a bank of digital and analog instruments ST290 Instruments included: Compass, Wind, Close hauled Wind Instrument, remote Plot auto pilot keypads (aft in the cockpit on port and starboard) SeaTalk2 remote keyboard: (located in port side lazarette for connecting and controlling all Raymarine Instruments) Raymarine SmartPilot Linear direct shaft drive autopilot system w/handheld remote control unit (mounted at navigation station) Raymarine 40-Mile radar dome mounted on a motorized tilt gimbal radar post Jenson Stereo System: Speakers located in cabin and cockpit areas Plotters have the latest Mapping Navionics Chart Chips Plotters are connected to an onboard Sirius Satellite Weather module and antenna system essential to safe navigation and piloting Plotters are connected to an AIS onboard module which shows real-time all commercial traffic and AIS enable recreational traffic in the area of your vessel. This enhances the powerful 40-mile range Radar system mounted on an electrically assisted articulating mount for optimum radar performance while on a sailing tack Integrated Raymarine Life Tag System

Full AC and DC Instrument Panels (3) House batteries (1) Start Battery with a full switch over capacity for redundant battery override (1) Bow Thruster Battery (located in Bow) Xantrex Link 20 Battery Monitor Systems Centaur Battery Charging System (Shore Power)

Mechanical and Steering

40 HP Yanmar Diesel Engine (very low hours and always serviced) Yanmar Sail Drive Racor fuel polishing system for polishing on-demand of fuel tank Algae-X Magnetic Fuel Conditioner (prevents unstable solids from forming and accumulating, keeping the filter and tank clean and safe) Racor fuel filtering system Espar heater (cabin, bathroom areas) 2-Blade Flex-o-Fold folding prop Rope cutter and stripper, mounted on the sail drive by Ambassador Marine Auto flush/macerator head with holding tank, Y valve New Yanmar instrument engine instrument panel at the helm Bilge alarm at the helm Spare Starter motor Bilge monitoring meter detects excessive turning on and off of bilge pumps 1 Sump bilge pump down at bottom of the sump 1 Sump pump (large capacity) Manual whale pump water extraction system (located in cockpit) Quick Nautic Boiler water heater (2) Xantrax Link 20 battery monitor systems Power Battery Charging System (Shore power) Onboard Racor fuel monitoring system In-line water filter Imtra SR80/185T retracting bow thruster with automatic Bombay door for tight maneuvering and allowing improved control of the vessel (dedicate battery)


Slide in companionway plexi glass door with sliding hatch fiber glass

Satin finish cherry wood interior with molded liner

Satin finish cherry storage cabinets S/S sink, fresh water foot pump Hot and cold pressure water Top-loading ice box with Seafrost 12V refrigeration Force 2-Burner propane stove w/broiler Propane detection system 6 gal. Engine/110 V water heater

Large solid cherry fold up leaf table with storage in middle

V-berth with storage cabinets and drawers port and starboard side Forward stateroom with solid cherry doors Aft stateroom with solid cherry privacy door

Head Shower Shower curtain holder Sump pump Hot and cold pressure S.S. sink Corian countertop Storage cabinets with sliding mirror fronts Electric flush head with Y-valve and 30 gallon holding tank Towel rack and clothes hooks


Faux teak and holly strips cabin sole AC outlets located in cabin areas Ultrasuede for all interior dinette and berth cushions

Additional Equipment

ACR Strobe Emergency Beacon (night and day) for Man over Board recovery The USCG-approved LifeSling recovery system for man overboard situations on the high seas. U.S. Coast Guard approved Horseshoe Buoy is a must-have for recreational or commercial use. A custom 100' Polyethylene 1" tow rope with custom connections was made specifically for safely towing the J124 in the rare case this becomes necessary. No need to worry about hurting any of the fittings or creating strains to the hardware while under tow.

Represented by a Certified Professional Yacht Broker (CPYB)

A Certified Professional Yacht Broker (CPYB) is recognized as having achieved the highest level of industry accreditation, available only to fully-qualified yacht sales professionals. The CPYB program is administered by Yacht Brokers Association of America in partnership with Florida Yacht Brokers Association, Northwest Yacht Brokers Association, California Yacht Brokers Association, Boating Ontario Dealers, British Columbia Yacht Brokers Association and Gulf Coast Yacht Brokers Association.

j124 sailboat

Follow This Boat

  • Frank Magazine
  • Denison History
  • Virtual Tours
  • --> --> -->