BoatsMariah 31

Mariah 31

Cutter · Long Keel w/trans. Hung Rudder · 1977–1983

A heavy-displacement cutter designed by Henry Mohrschladt with a long keel and a signature extended bowsprit

Designed by Henry Morschadt, built by Pacific Seacraft.

LOA
Beam
Draft (max)
Displacement
Ballast
Hull type
Long Keel w/trans. Hung Rudder

See her sail

The Mariah 31, on the water

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

Footage from Breaking Waves

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 narrow beam gives 37 — a sea-kindly motion in a seaway.

Comfort ratio 37
CoastalBluewater

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

Capsize screening 1.70
LightHeavy

457 — very heavy for her waterline, a serious load-carrying cruiser.

Displacement / length 457
EasygoingPowered-up

14.6 — modest power for her weight; easygoing rather than lively, and happier with a breeze.

Sail area / displacement 14.6
TenderStiff

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

Ballast 38%

Built heavy and sea-kindly — a boat made to cross oceans and forgive a rough night.

What the fleet has seen

The Mariah 31, as the fleet has seen it

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

The Mariah 31 is a cutter-rigged sailboat designed by Henry Morschadt and built by Pacific Seacraft from 1977 to 1983. It features a long keel with a transom-hung rudder, an LOA of 11.3 meters, a beam of 3.3 meters, and a draft of 1.4 meters, displacing 7257 kg.13:44 Early versions of the Mariah 31 had a 4-foot bowsprit, which was extended to 5 feet on later MK II versions. Aboard *Kiana*, a Pacific Seacraft Mariah 31 crew discussed their DIY hard dodger and a custom triple-stage water filtration system for Mexican tap water.15:16

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

The record

Full specifications

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

Dimensions
Weights
Ballast / displacement
37.5%
Rig & sail area
Rig
Cutter
Ratios
SA / displacement
14.6
Displacement / length
457.1
Comfort ratio
36.8
Capsize screening
1.70
Hull speed
6.7 kn
Pounds / inch immersion
957
Hull
Hull type
Long keel w/trans. hung rudder
Construction
Fiberglass
Production
Years built
1977–1983
Units built
89
Designer
Henry Morschadt
Builder
Pacific Seacraft

Boats like this, on the water

More boats like her, on the water

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Alberg 3711.33 mSame hull familyNear-identical lengthA long-keeled masthead sloop produced for two decades with a transition from wood-heavy interiors to moulded fiberglass
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Cape Dory 3611.01 mSame hull family0.3 m shorterProduced from 1978 to 1990, this long-keeled cutter was later marketed as the Robinhood 36
10,000 Mile Gear Review After Solo Sailing an Atlantic Circuit0:01from Atom Voyager
Seafarer Yachts 38C11.51 mSame hull family0.2 m longerA versatile cruiser available in multiple rig configurations and often sold in kit form for owner completion
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Henry R. Hinckley Pilot 3510.90 mSame hull family0.4 m shorterA Sparkman & Stephens fiberglass classic designed for Hinckley, featuring a long keel and available as a sloop or yawl
Don’t Launch Without This: The Essential Sailboat Maintenance Guide7:51from Practical Sailor
Morgan Yachts Out Island 3610.92 mSame hull family0.4 m shorterA 1970s production cruiser featuring a 1.14-metre draft and a heavy ballast ratio for stability in shallow waters
AMAZING MACHINES! How They Make Sailboat Sails12:02from Practical Sailor
Bristol Channel Cutter11.51 mSame hull family0.2 m longerA Lyle Hess-designed cutter with a long keel and transom-hung rudder, built for offshore work since 1976
FULL Sailboat Tour --28' 1978 Bristol Channel Cutter "Artha" ------- [Sailboat For Sale $$$]26:17from Adventureman Dan

The family

Boats like this

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

Mariner 31A long-keeled masthead ketch and the first fiberglass hull from Far East Yachts, featuring a plywood-cored deckMariner 32A long-keeled masthead ketch by Clair Oberly, featuring a distinctive Clipper bow and an open, taffrail-surrounded cockpitHunter Marine 31A Cortland Steck design featuring a B&R rig and a fin keel, built for coastal cruising between 1983 and 1987Pacific Seacraft 31A 1987-era cutter with a 42% ballast ratio, designed for offshore stability and re-introduced to production in 2002Mariner Yachts 31 (Spisak)A 9.55-metre fractional sloop available with either a centerboard or fin keel to meet EC Category B or C requirementsMarlow-Hunter 31A 2015 Glenn Henderson design featuring a bulb-weighted fin keel and a beam of 3.61 metres for interior volume

Keep asking

The fleet has more to say

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