BoatsJ J/99

J J/99

Fractional Sloop · Fin w/bulb & Spade Rudder · First built 2019

A high-performance fractional sloop by Alan Johnstone, designed for competitive offshore racing and fast shorthanded sailing

Designed by Alan Johnstone.

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

See her sail

The J J/99, 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 moderate beam gives 18 — a quick, lively motion that feels every wave.

Comfort ratio 18
CoastalBluewater

2.20 — right around the 2.0 line, the edge between coastal and offshore.

Capsize screening 2.20
LightHeavy

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

Displacement / length 161
EasygoingPowered-up

22.2 — a lot of sail for her weight; powered-up and eager, a real performer.

Sail area / displacement 22.2
TenderStiff

40% of her weight is ballast — moderately stiff, a middle-of-the-road stability.

Ballast 40%

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

  • Draws more than ~86% of boats her size on file

Compared with 2856 boats of the same type within a quarter of her length.

What the fleet has seen

The J J/99, 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/99 is a 9.9-meter fractional sloop designed by Alan Johnstone and built by J Boats since 2019, featuring a fin with bulb and spade rudder hull, with twin rudders and an all-lead deep fin keel available as options. It displaces 3817 kg with a 2.0-meter draft and a 3.4-meter beam. Aboard SEILmagasinet, Petter Gustafsson sailed a J/99 to an overall victory in the Færderseilasen 2025 regatta, having transitioned from a J/111. During the race, the crew executed approximately 100 jibes down the center of the fjord to maximize wind pressure, overtaking competitors who hugged the eastern shore.1:53 Gustafsson attributes the win to tactical positioning rather than boat speed in light air, emphasizing real-time visual observation of wind conditions over data analysis during the race.2:47 For regatta safety, the J/99 crew carries two buckets with lanyards, a waterproof first-aid kit, a foghorn, and a manual compass, along with conical wooden plugs for through-hull fittings.5:03 Personal safety gear includes life jackets with crotch straps, lights, and spray hoods, inspected annually.14:10

The living fleet

Sailed by the fleet

Where the fleet has filmed this boat.

Seen once across one channel of the fleet.

Basemap © Wikimedia Commons · CC BY-SA 4.0

On the water

The J J/99 on video

The record

Full specifications

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

Dimensions
Weights
Ballast / displacement
39.8%
Rig & sail area
Rig
Fractional Sloop
Ratios
SA / displacement
22.2
Displacement / length
160.6
Comfort ratio
17.5
Capsize screening
2.20
Hull speed
7.2 kn
Pounds / inch immersion
1142
Hull
Hull type
Fin w/bulb & spade rudder
Construction
Balsa/foam composite with vinylester resin
Ballast type
Cast iron fin and integral lead wedge shoe
Production
Years built
First built 2019
Designer
Alan Johnstone
Builder
J, Boats, Composites

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 32310.01 mSame hull familyNear-identical lengthA masthead sloop with a 1.45m draft and bulb keel, optimized for coastal cruising comfort since 2001
Beneteau Oceanis 319.66 mSame hull family0.3 m shorterA Finot-Conq designed fractional sloop balancing a modern hull form with a stable 1.8-meter bulb keel
Jeanneau Sun Fast 330010.11 mSame hull family0.2 m longerA high-performance offshore racer featuring a lightweight hull and dual rudders, designed by Andrieu and Verdier
Dehler Yachts 3410.10 mSame hull family0.2 m longerAn IOR 3/4 ton racer-cruiser designed by Van de Stadt, offering a balanced performance pedigree in a comfortable hull
Aphrodite 1019.94 mSame hull familyNear-identical lengthA 9.9-meter fin-keeler with a 57% ballast ratio, designed by Elvstrom and Kjaerulff for high-speed, stiff sailing
Salona 349.99 mSame hull familyNear-identical lengthA J&J-designed fractional sloop balancing a performance-oriented SA/D ratio with a stable, modern fin-and-bulb hull

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.

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The fleet has more to say

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