BoatsMercury 18

Mercury 18

Masthead Sloop · Fin Keel · First built 1939

A pioneering one-design plywood sloop from 1939 that remains a lively, high-performance racer today

Designed by Ernest Nunes, built by Nunes.

LOA
Beam
Draft (max)
Displacement
Ballast
Hull type
Fin Keel

Is it for you?

Character

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

TrailerableBeam 1.62 m — inside the 2.55 m no-permit tow width across most of Europe, and the 2.59 m US and Canadian limit. About 499 kg of hull, so roughly 1,100 kg on a trailer: check that against your own towing rating.Shoal draftDraws 0.94 m, board up where she has one — creeks, sandbars and thin anchorages most keels have to stay out of.
LivelySea-kindly

Her moderate displacement on a narrow beam gives 13 — a quick, lively motion that feels every wave.

Comfort ratio 13
CoastalBluewater

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

Capsize screening 2.07
LightHeavy

224 — moderately heavy for her waterline, a balanced cruising weight.

Displacement / length 224
EasygoingPowered-up

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

Sail area / displacement 25.1
TenderStiff

58% of her weight is ballast — very stiff, carrying full sail in a blow.

Ballast 58%

Powered-up and quick to accelerate — this one likes to sail.

  • Lighter than ~89% of boats her size on file
  • Narrower than ~100% of boats her size on file

Compared with 280 boats of the same type within a quarter of her length.

The record

Full specifications

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

Dimensions
Weights
Ballast / displacement
57.7%
Rig & sail area
Rig
Masthead Sloop
Ratios
SA / displacement
25.1
Displacement / length
223.5
Comfort ratio
12.6
Capsize screening
2.07
Hull speed
4.8 kn
Pounds / inch immersion
248
Hull
Hull type
Fin Keel
Construction
Plywood
Ballast type
Lead
Production
Years built
First built 1939
Designer
Ernest Nunes
Builder
Nunes, W. D. Schock, Moore Sailboats

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.

Borge Bringsvaerd Bb116.18 mSame hull family0.7 m longerA Norwegian-built classic with an active class association that has raced continuously since the 1960s
Santana 206.16 mSame hull family0.7 m longerA high-performance fractional sloop with a 1996 deck redesign that added an open transom and a roomier cockpit
Bavaria Yachts 6066.50 mSame hull family1.0 m longerA lightweight 6.5-meter fractional sloop with a high sail-area-to-displacement ratio for spirited coastal sailing
Marieholm Boats S-206.00 mSame hull family0.5 m longerA short-run 1970s fractional sloop with a fin keel and transom-hung rudder, designed for coastal agility
Birdyfish S4.20 mSame hull family1.3 m shorterA 4.2-metre foiling monohull with a 100kg displacement and a high-performance Marconi cat rig
J Boats Tillotson Pearson J/226.86 mSame hull family1.4 m longerA high-performance fractional sloop with a high sail-area-to-displacement ratio designed for competitive one-design racing

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 looking

Nothing filmed of this one yet

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

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