Design and Construction
The J/45 is longer on the waterline and wider than its nearest predecessors, the J/44 and J/46, yet its maximum beam is not carried all the way aft, and the hull has no hard chines, relatively low freeboard, and a relatively fine bow. Those choices produce a hull that heels a bit more and won't surf quite as readily in strong downwind conditions as some modern designs, but it promises better all-around performance, particularly in light to moderate air, with a smoother, more efficient motion going upwind.
Structurally, the hull and deck are cored with PVC foam of varying densities and vacuum-infused in one shot per the proprietary SCRIMP system, while the internal load-bearing structure consists of a composite grid and composite bulkheads fully bonded to the hull. The laminate supporting the L-shaped fin keel, which is cast iron with a lead bulb, is all solid, and the deep single rudder is very grippy—far enough aft to turn the boat authoritatively but just forward enough to stay clear of turbulent flow off the transom.
Rig and Handling
The J/45's hull is easily driven, and its standard rigging is rod rigging with fiber rigging available as an upgrade. Under mainsail alone in 12–16 knots true wind, the boat carried better than 8 knots on a reach and could pinch as high as 30 degrees off apparent wind while still moving at over 4 knots; with jib and main it exceeded 9 knots on a beam reach, and in 9 knots true it made well over 7 knots at a 40-degree apparent wind angle. Test sailors found her helm feel light and positive with the perfect amount of weather helm, and like any good performance boat she is sensitive to sail trim.
Under power, the 75-hp Volvo diesel auxiliary turning a three-blade folding prop on a saildrive pushed the test boat along at a tidy 9 knots flat out at 2,950 rpm and still made 7.6 knots at a moderate cruise setting of 2,250 rpm. The cockpit is laid out with twin wheels and a traveler, primary winches nearby, adjustable jib-sheet fairleads from the cockpit, and a double-ended German-style mainsheet with tails reachable from either wheel.
Accommodations
The J/45's interior aesthetic was refined by French interior designer Isabelle Racoupeau, yielding a sleek, very open, modern look that remains fundamentally purposeful. There is a good-size nav desk, a galley aft with a large sink near centerline, long straight settees that can double as sea berths, and lots of handholds. Overall interior volume is necessarily reduced due to the boat's moderate beam, particularly aft, yet things do not feel cramped below.
The boat can be configured with twin aft staterooms—the builder claimed those are the largest yet on a J/Boat—or, by deleting the starboard aft stateroom, a larger aft head to starboard with a proper shower stall and big storage space behind it. The saloon has a dining table with U-shaped seating outboard to port and a settee opposite, and interior trim and furniture are available in white oak with walnut as standard.
Equipment and Options
The test boat was equipped with a generator, air conditioning, retractable bow thruster, carbon mast with fiber rigging, a carbon Danish-built FurlerBoom, and North 3Di sails. Beyond that, the boat can be equipped with optional Harken Performa winches including an electric main-halyard winch, a dual-function hydraulic panel for backstay and boom vang, a carbon Furler Boom from Denmark, composite standing rigging from Future Fibres, and a suite of B&G electronics. Flexiteek is the standard deck material, with teak in the cockpit and side decks available as an add-on.
Known Issues
The documented record shows no structural defects, recurring systemic failures, or owner-reported problem areas for the J/45. The documented facts center on design trade-offs rather than faults: the moderate beam reduces aft volume, and the hull form gives more heel and less surfing than some contemporaries downwind. These are inherent characteristics, not defects.
The Verdict
The J/45 is a thoughtfully evolved performance cruiser that returns J/Boats to bigger multipurpose boats without abandoning its measured design philosophy. It is quick in light to moderate air, well-mannered on the helm, and genuinely livable below despite its moderate beam.
Pros
- Offshore-capable and suited to both racing and cruising
- Easily driven hull with strong upwind and light-air performance
- Light, positive helm with appropriate weather helm
- Purposeful, open interior by a noted designer with flexible aft layouts
- Infused foam-cored construction with solid keel-structure laminate
Cons
- Heels more and surfs less readily downwind than some modern designs
- Reduced interior volume aft from moderate beam
- Sensitive to sail trim like any true performance boat
