BoatsThom Cat 15

Thom Cat 15

Gaff head Cat · Centerboard (Trunk) · First built 2001

A Menger-designed gaff-rigged daysailer with a high sail-area-to-displacement ratio for spirited performance

LOA
Beam
Draft (max)
Displacement
Hull type
Centerboard (Trunk)

Is it for you?

Character

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

TrailerableBeam 2.13 m — inside the 2.55 m no-permit tow width across most of Europe, and the 2.59 m US and Canadian limit. About 318 kg of hull, so roughly 900 kg on a trailer: check that against your own towing rating.Ramp-launchableAbout 318 kg of hull, with a keel that raises or a draft shallow enough to float off a trailer — she can go back on the trailer at the ramp, not only into the water.Shoal draftDraws 0.18 m, board up where she has one — creeks, sandbars and thin anchorages most keels have to stay out of.
LivelySea-kindly

Her light displacement on a beamy beam gives 5 — a quick, lively motion that feels every wave.

Comfort ratio 5
CoastalBluewater

At 3.16 she sits above the 2.0 line — beamy for her weight, and happiest coastal.

Capsize screening 3.16
LightHeavy

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

Displacement / length 93
EasygoingPowered-up

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

Sail area / displacement 29.5

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

The record

Full specifications

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

Dimensions
Weights
Rig & sail area
Rig
Gaff head Cat
Ratios
SA / displacement
29.5
Displacement / length
92.6
Comfort ratio
5.4
Capsize screening
3.16
Hull speed
5.2 kn
Pounds / inch immersion
375
Hull
Hull type
Centerboard (Trunk)
Construction
Fiberglass
Production
Years built
First built 2001
Designer
Menger
Builder
Menger Boatworks, Thompson Boatworks

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.

Drascombe Dabber4.72 mSame hull familyNear-identical lengthA John Watkinson-designed sprit-rigged daysailer with a centerboard, built since 1970 for shallow-water versatility
RS Quest4.29 mSame hull family0.3 m shorterA 140kg fractional sloop with a centerboard trunk designed for stable, versatile training and family sailing
Microtonner 195.50 mSame hull family0.9 m longerA high-performance fractional sloop designed by Nestor Volker to the International Micro Class rule for competitive racing
Marshall Marine Corporation Sanderling5.54 mSame hull family1.0 m longerA gaff-rigged catboat based on a 1941 design, featuring a shallow-draft keel-centerboard hull for versatile day sailing

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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