Seaforth 36
Masthead Ketch · Twin keels · First built 1980
A twin-keeled masthead ketch designed by C.S.J. Roy for shoal-draft cruising with a stable, comfortable motion
Designed by C. S. J. Roy, built by Trident Marine.
- LOA
- Beam
- Draft (max)
- Displacement
- Ballast
- Hull type
- Twin Keel
Is it for you?
Character
Where this design lands on the numbers a shopper trusts — read straight from her own ratios.
Shoal draughtDraws 1.14 m, board up where she has one — creeks, sandbars and thin anchorages most keels have to stay out of.
LivelyComfort 27Sea-kindly
CoastalCapsize 1.88Bluewater
LightD/L 246Heavy
EasygoingSA/D 12.1Powered-up
TenderBallast 33%Stiff
A capable cruiser that sits just inside the offshore line — coastal work with real passages in her.
- Draws less than ~98% of boats her size on file
Compared with 2968 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
33.3%
Rig & sail area
Rig
Masthead Ketch
Ratios
SA / displacement
12.1
Displacement / length
246.0
Comfort ratio
26.9
Capsize screening
1.88
Hull speed
7.2 kn
Pounds / inch immersion
1156
Hull
Hull type
Twin Keel
Construction
Fiberglass
Production
Years built
First built 1980
Designer
C. S. J. Roy
Builder
Trident Marine
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.
Pearson Yachts 3611.14 mSame hull family0.2 m longerA William H. Shaw-designed masthead sloop built for the IOR One Ton rule, featuring a fin keel and skeg-mounted rudder
Hunter Marine 3610.95 mSame hull familyNear-identical lengthA masthead sloop with a 44% ballast ratio, designed for stable coastal cruising during a short early-eighties production run
Contessa 3510.82 mSame hull family0.2 m shorterA Doug Peterson-designed IOR One Ton racer that claimed the 1974 International One Ton Cup with her prototype Gumboots
Moody 36S10.97 mSame hull familyNear-identical lengthAn aft-cockpit variation of the Moody 36, featuring a fin keel and skeg-mounted rudder for balanced coastal cruising
Hallberg-Rassy 3511.13 mSame hull family0.2 m longerA shallow-draught fin-keeler with a 1.3-metre draught, built for coastal cruising and ease of access to shoal anchorages
Catalina Yachts 3611.07 mSame hull familyNear-identical lengthA versatile coastal cruiser offering optional tall rig and wing keel configurations to suit varying water depths
The family
Boats like this
Nearby designs by size, type, and era — worth a look alongside her.
Seaforth 24A Stephen Seaton-designed masthead sloop with a long keel and shallow draft, built for steady, comfortable cruisingSeafarer Yachts 37A 1980 fin-keeler with a skeg-mounted rudder, offering a 29.14 comfort ratio for stable offshore passage-makingSeafarer Yachts 36CA masthead ketch based on Rhodes Design 702, featuring a long keel and a high comfort ratio for steady cruisingSeaward 24A 7.32-metre fractional sloop with a keel-centerboard configuration and a 1.07m draft for versatile coastal accessSeafarer Yachts 26A 1977 masthead sloop with a 1.14-metre draft, designed for coastal stability and efficient light-displacement sailingSeafarer Yachts 23A McCurdy & Rhodes-designed masthead sloop with a fin keel, balanced for coastal cruising and club racing
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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