J/122
Dimensions
| Hull type | Monohull |
| LOA | 40.00 ft (12.19 m) |
| LWL | 34.60 ft (10.55 m) |
| Beam | 11.91 ft (3.63 m) |
| Draft | 7.22 ft (2.20 m) |
| Displacement | 14,900 lbs (6,759 kg) |
| Ballast | 5,600 lbs (2,540 kg) |
| Sail area (total) | 865 sq ft (80.4 m²) |
| Rig type | sloop |
| Keel type | fin_with_bulb |
| Rudder type | Spade |
| Rudder material | GRP / E-glass fiberglass |
| Rudder shaft | Stainless steel |
| Fuel capacity | 35 gal |
| Water capacity | 42 gal |
| Designer | Alan Johnstone |
Construction
Sources
Dimensions/displacement/sail area per jboats.com J/122E tech specs and sailboatdata.com. Hull confirmed as infusion-molded sandwich (fiberglass/balsa core/vinylester resin, SCRIMP process) per J/Boats. Mast confirmed auto-claved carbon fiber, standard. Main/jib breakdown not separately published; total 100% SA figure only. Designer attribution has some ambiguity in press between Alan and Rod Johnstone; J/Boats company materials credit Alan Johnstone as chief designer for this era. Verified 2026-07-09. [Rudder/tankage/electrical update, 2026-07-16]: Rudder: high-aspect composite spade with a stainless steel stock, JP3 self-aligning bearings. Fuel 35gal, water 42gal (a second optional water tank is offered). No holding-tank or electrical-system data found.