BoatsJ J/40

J J/40

Fractional Sloop · Fin w/bulb & Spade Rudder · First built 2024

A 2024 Alan Johnstone fractional sloop featuring a high-performance fin keel and spade rudder configuration

Designed by Alan Johnstone.

LOA
Beam
Draft (max)
Displacement
Ballast
Hull type
Fin w/bulb & Spade Rudder

See her sail

The J J/40, on the water

The fleet's own footage — the truest look at how she really moves.

Footage from SEILmagasinet

Is it for you?

Character

Where this design lands on the numbers a shopper trusts — read straight from her own ratios.

LivelySea-kindly

Her light displacement on a narrow beam gives 23 — a moderate, middle-of-the-road motion.

Comfort ratio 23
CoastalBluewater

1.98 — just under the 2.0 offshore line; her beam is modest for her weight.

Capsize screening 1.98
LightHeavy

150 — light for her waterline, so she is easily driven and quick to accelerate.

Displacement / length 150
TenderStiff

38% of her weight is ballast — moderately stiff, a middle-of-the-road stability.

Ballast 38%

Light and lively — happiest day-sailing and coastal-hopping in settled weather.

  • Draws more than ~81% of boats her size on file

Compared with 2563 boats of the same type within a quarter of her length.

What the fleet has seen

The J J/40, as the fleet has seen it

Derived from the videos the fleet has analysed of this model. ▶ marks open the moment aboard.

The J J/40 is a 13.2-meter fractional sloop racer-cruiser designed by Alan Johnstone and built by J Boats since 2024. It features a fin with bulb and spade rudder hull, a 2.2-meter draft, and displaces 7665 kg. The J/40 prioritizes sailing characteristics over interior volume, with a lower freeboard and narrower beam than many contemporary cruisers. Aboard *59° North Sailing*, a J/40 experienced a severe rudder-post leak during a delivery from the U.S. East Coast to Bermuda, where a stainless steel component shifted up the rudder shaft, breaking the watertight seal and causing the rudder post to clunk violently in heavy seas.39:15 The crew hove to for several days to manage the leak, which overwhelmed primary bilge pumps, and successfully reached Bermuda. *SEILmagasinet* noted the J/40's balanced steering and responsive performance during sea trials off Palma de Mallorca, where it maintained speeds of 6 to 7 knots while beating in varying wind conditions.30:22 The deck layout includes a carbon mast and Harken hardware. The interior offers a functional galley and well-ventilated aft cabins, though the head is compact.3:32 The J/40 performs well under a large gennaker and maintains stability when loaded for cruising. Base pricing starts at 350,000 euros, with tested configurations reaching 450,000 to 470,000 euros.watch The J/40 earned the European Yacht of the Year award in Düsseldorf.0:35

The living fleet

Sailed by the fleet

Where the fleet has filmed this boat.

Seen 2 times across 2 channels of the fleet.

Basemap © Wikimedia Commons · CC BY-SA 4.0

On the water

The J J/40 on video

What they go for

Market signal

Where the fleet has seen this model come up for sale.

1seen for sale
  • The specific boat reviewed, with extras like a carbon mast and teak deck, is priced at 450,000 euros

    from SEILmagasinetseen April 20253:58

From the fleet's own footage — our observed signal, not broker listings.

The record

Full specifications

The complete reference set — tap any figure to switch between metric and imperial.

Dimensions
Weights
Ballast / displacement
37.8%
Rig & sail area
Rig
Fractional Sloop
Ratios
Displacement / length
150.2
Comfort ratio
22.9
Capsize screening
1.98
Hull speed
8.1 kn
Pounds / inch immersion
1669
Hull
Hull type
Fin w/bulb & spade rudder
Construction
Composite/resin injection and infusion
Production
Years built
First built 2024
Designer
Alan Johnstone
Builder
J, Boats

Boats like this, on the water

More boats like her, on the water

Comparable boats the fleet has on camera: same type, within a quarter of her length. Open the boat, or watch the video — a timestamp means she only appears in passing.

Beneteau 42313.15 mSame hull familyNear-identical lengthA masthead sloop featuring a fin keel with bulb and spade rudder, offered with both shallow and deep draft options
Arcona 43013.15 mSame hull familyNear-identical lengthA 2007-era fractional sloop featuring a high 22.16 sail-area-to-displacement ratio for responsive performance
Hunter Marine 42013.23 mSame hull familyNear-identical lengthA 42-foot cruiser with a performance-oriented fin keel and spade rudder, built for efficient coastal and offshore travel
Ct-44 (Pilot House)13.16 mSame hull familyNear-identical lengthA Tanton-designed pilot house cutter featuring a fin keel and skeg-mounted rudder for offshore stability
Jeanneau Sun Odyssey 4313.21 mSame hull familyNear-identical lengthA 13.2-meter masthead sloop offered with a shallow draft keel option and also marketed as the Moorings 43
Dufour Yachts 430 Grand Large13.24 mSame hull familyNear-identical lengthA 2019 Umberto Felci design with a 2.1-meter bulb keel and a high sail-area-to-displacement ratio for spirited cruising

The family

Related models

The designs closest to hers — usually the rest of the builder's range, sometimes the same hull sold under another name.

Keep asking

The fleet has more to say

Search what's been said about the J J/40, or ask a specific question — the answer comes back written out, with links to the moments it draws on.

The newsletter

New boats, new stories, from everywhere.

One email from the fleet — boats newly added, videos newly analyzed. No noise.

Report an issue