BoatsJonmeri Yachts 33

Jonmeri Yachts 33

Masthead Sloop · Fin w/bulb & Spade Rudder · First built 1979

A Jorma Nyman-designed masthead sloop with a fin keel and bulb, built for offshore stability since 1979

Designed by Jorma Nyman, Strahlman & Karl-Johan Strahlmann.

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

Is it for you?

Character

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

LivelySea-kindly

Her heavy displacement on a moderate beam gives 29 — a moderate, middle-of-the-road motion.

Comfort ratio 29
CoastalBluewater

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

Capsize screening 1.86
LightHeavy

315 — heavy for her waterline, built to carry stores and ride steadily.

Displacement / length 315
EasygoingPowered-up

15.3 — moderate power for her weight; steady, all-round performance.

Sail area / displacement 15.3
TenderStiff

35% of her weight is ballast — moderately stiff, a middle-of-the-road stability.

Ballast 35%

A capable cruiser that sits just inside the offshore line — coastal work with real passages in her.

The record

Full specifications

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

Dimensions
Weights
Ballast / displacement
35.0%
Rig & sail area
Rig
Masthead Sloop
Ratios
SA / displacement
15.3
Displacement / length
314.8
Comfort ratio
29.4
Capsize screening
1.86
Hull speed
6.9 kn
Pounds / inch immersion
1043
Hull
Hull type
Fin w/bulb & spade rudder
Construction
Fiberglass
Ballast type
Lead
Production
Years built
First built 1979
Units built
200
Designer
Jorma Nyman, Strahlman, Karl-Johan Strahlmann
Builder
Jonmeri

Boats like this, on the water

Nobody has filmed this one — but these are close.

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.

Westerly Yachts Ltd. Discus 3310.14 mSame hull familyNear-identical lengthAn aft-cockpit evolution of the Westerly 33, featuring a masthead rig and the choice of fin or twin keels
Westerly 3310.14 mSame hull familyNear-identical lengthA center-cockpit masthead sloop offered with fin or bilge keels, designed for stable cruising and long-range comfort
Dufour Yachts 3410.25 mSame hull family0.2 m longerA 1974 masthead sloop featuring a skeg-mounted rudder and a balanced displacement-to-ballast ratio for offshore stability
Islander 329.91 mSame hull family0.2 m shorterA J.H. McGlasson-designed masthead sloop that served as the foundational hull for the later Islander 33 and 34 models
Moody 3410.19 mSame hull familyNear-identical lengthA 1980s mid-sized cruiser with a 40% ballast ratio, designed for stability and predictable handling in coastal waters
Hunter Marine 339.96 mSame hull familyNear-identical lengthA 1977 masthead sloop with a 38% ballast ratio, designed for stability and coastal performance

The family

Boats like this

Nearby designs by size, type, and era — worth a look alongside her.

Keep looking

Nothing filmed of this one yet

Two ways to keep looking — both search what the fleet has actually recorded.

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