New listing!

J Boats J/121

Hamble, GB


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2017 J Boats J/121

A rare opportunity to purchase a second hand, UK VAT paid J/121.

The US built 121, is like no other in the J Boats range. Made to give the performance and enjoyment of a fully crewed race with minimal crew on board. The twin ballast tanks with 370 litre capacity each side give the weight of extra crew on the rail offering speed and stability when inshore or offshore racing.

Professionally maintained from new ‘Rock Lobster’ has been successfully campaigned, achieving 2nd in Class 1B in the 2021 Fastnet race. Every attention has been paid to maintaining her to the highest standard and ensuring she is race ready! The hull has been professionally faired, and Velocowrap non-skid has recently been installed on the cockpit floor.

The specification includes a full suite of B&G H5000 electronics including H5000 autopilot, 3D motion sensor and Navico Precision 9 heading, heel and trim sensor, with integrated forestay load sensor giving you comprehensive and accurate data through cockpit displays. As well as a generous wardrobe of 3Di North Sails, the wide variety of sails give you the best combination for any eventuality on the racecourse.

For more information and to arrange a viewing, please contact us. She will soon be available to view in Hamble.


Basic Boat Info

Tax Status:
Boat Name:
#3 ex. 'Rock Lobster'
J Boats
Alan Johnstone
Keel Type:

Engines / Speed

Number of Engines:
Total Engine Power:
29 hp
29 horsepower


39.99 ft / 12.19 m
Length Overall:
39.99 ft
11.75 ft
Max Draft:
7.25 ft
12,899.25 lb

Additional Info

  • Hull and deck in vacuum infused SCRIMP molded GRP
  • Finished in white gelcoat
  • Hull professionally race-faired
  • Two tone non-skid deck
  • GRP molded structural main bulkhead
  • Velocowrap non-skid decking applied to cockpit floor (2022)
  • Transverse molded keel support grid forward and aft with composite structural beams and composite mast bearing beam
  • Lead flat IRC keel
  • Balanced spade composite rudder with self-aligning Jefa bearings (bearings replaced 2022)
  • Twin wheel steering with Carbonautica custom composite wheels
  • 100 gallon (378 litre) seawater ballast tank per side, with transfer valves and overboard drain
  • Yanmar 3YM30ACE 29hp inboard engine (professionally serviced each year)
  • 125 Ah alternator
  • Gori 2 blade folding prop
  • 25 gallon (94 litre) fuel tank
  • Stanchions, pushpit, pulpit and steering pedestals black powder coated
  • 2x Additional opening ports on aft face of coachroof
Spars, Rigging and Deck Gear
  • Southern Spars carbon fibre, autoclave cured mast with double carbon fibre spreaders
  • Carbon boom
  • Composite backstay (replaced 2022) with hydraulic adjuster
  • Nitronic 50 discontinuous rod rigging
  • Carbon fibre retractable bow sprit, black painted, with bobstay
  • Southern Spars rigid boom vang with control lines
  • 2x Harken Performa 52.1 self-tailing primary winches
  • 2x Harken Performa 46.1 self-tailing halyard winches
  • 2x Harken Performa 46.1 self-tailing mainsheet winches
  • 6:1 Harken mainsheet traveller system
  • Adjustable jib lead system with floating lead blocks and inhaul and out
  • High specification running rigging throughout 
  • Twin tack lines, 1x 2:1
  • 2:1 Main halyard
  • 2x jib halyards
  • 2x Spinnaker halyards
  • Inner jib halyard with integral halyard lock
  • Upgraded Spinlock clutches
  • Additional outboard clutches
  • 4x Antal folding mooring cleats
  • Stanchions, pushpit and pulpit black powder coated
  • 2020 North Sails 3Di mainsail on cars
  • 2018 North Sails 3Di mainsail on cars
  • 2017 North Sails 3Di J1 
  • North Sail 3Di delivery J2 
  • 2020 North Sails 3Di J2
  • 2017 North Sail 3Di J3 
  • 2020 North Sail 3Di inner jib
  • 2020 North Sails Spinnaker Staysail on furler
  • 2020 North Sails A2 (with logo)
  • 2017 North Sails A2 in snuffer (with logo)
  • 2017 North Sails A3
  • 2017 North Sails Code 0
Electronics and Electrical Systems
  • 3x 90Ah batteries (2022)
  • Victron battery monitor with Bluetooth capabilities
  • 125 amp engine alternator
  • Shorepower system with shorepower cable
  • Mastervolt 25A battery charger
  • Double UK socket in galley
  • USB socket at chart table


  • B&G H5000 Hercules Base pack
  • 2x B&G H5000 graphic display on aft face of coach roof
  • 2x B&G Zeus 2 9" chartplotters (at chart table and in cockpit)
  • 4x B&G 20/20 displays on mast bracket
  • B&G H5000 autopilot and H5000 remote
  • Forestay load sensor
  • Jefa Direct Drive 
  • Navico Precision 9 NMEA2000 heading, heel and trim sensor
  • B&G H5000 3D Motion sensor
  • B&G V50 DSC VHF with AIS receiver
  • NAIS-500 AIS System with splitter
  • B&G H50 Wireless VHF handset with charger at chart table
  • GoFree WiFi module
  • Actisense NMEA 2000 Micro-c USB for PC
  • Fusion RA70N stereo
  • Diesel heating
  • Saloon with settee berths and hinged pilot berths
  • Sit-down chart table with outboard instrument panel
  • L-shaped galley with 2x JetBoils on gimbal, sink with freshwater foot pump and top opening icebox
  • Original gas oven included (not installed)
  • Quarter berth cabin aft of galley
  • Heads aft with sink, detachable shower head, shower sump pump and marine toilet
  • Access to large cockpit locker through heads
  • Open V berth forward cabin, for sail stowage
  • Pressurised water system to heads and galley sinks
  • 26 gallon (98 litre) freshwater tank
Equipment and Safety Kit
  • Emergency tiller
  • RORC emergency steering oar and rollock
  • Horseshoe buoy
  • Throwing line
  • Manual and electric bilge pumps
  • Below deck OSR manual bilge pump
  • Cruising anchor
  • 2x Racing anchors with chain and warp
  • Mainsail cover
  • Leecloths for aft berth and saloon berths
  • Wheel covers
  • Padded lifeline covers
This company, acting as brokers on behalf of the selling owner, who is a private individual. Offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.