Seawolf 30

1984–1986 · designed by David Feltham

A British twin-bilge-keel cruiser designed by David Feltham, who had a reputation for bilge keelers that sailed well, and built in Plymouth in small numbers in the mid-1980s (owners put the run at ten to fifteen hulls). The twin keels let the boat take the ground upright on a drying mooring, and the layup is described by owners as unusually heavy for the size, which is said to be why so few were built. Owners report a boat that is light on the helm and goes to windward well for a bilge keeler, with a large mainsail that wants reefing early.

This is a general read on the Seawolf 30 class — informed background, not a verdict on any individual boat. Condition, refit history, and how a particular hull was sailed and stored matter far more than class reputation. Use it to know what to look for; for a read on a specific listing, run a free FairKeel report on that boat.

At a glance

Hull form: Bilge
Hull construction: Fiberglass
Production: 1984–1986
Built in: United Kingdom

What the Seawolf 30 is known for

Twin bilge keels give a shoal draft and let the boat dry out upright on mud or sand, ideal for UK tidal harbours and drying moorings.
Moderate displacement and a low ballast position give a forgiving, seakindly motion for a boat of this size in a coastal chop.
Simple, unfussy systems typical of small British production yards of the era, which keeps maintenance and parts sourcing straightforward.
No need for a deep-water berth or lifting keel mechanism, which widens the range of harbours and marinas the boat can use.

Known trade-offs

Twin keels increase wetted surface and generally sail flatter but slower to windward than an equivalent fin-keel design of the same length.
Keel-to-hull joints on bilge keelers are a known long-term weak point, prone to stress cracking or weeping as the boat ages.
Build and design records for smaller British yards of this era are often incomplete or lost, making hull provenance and exact specification hard to verify secondhand.
Interior volume on a 30ft boat of this vintage is modest by modern standards, limiting comfortable liveaboard use to short stints or a couple.

Age-related quirks to expect

Keel-root gelcoat crazing and weeping at the twin-keel-to-hull joint severity: Medium affects: all production years

Iron ballast corrosion / rust-bleed through the keel seams as encapsulation ages severity: Medium affects: all production years

Original auxiliary engine (diesel or petrol) commonly unreplaced and due for a repower on unrestored boats severity: Medium affects: early-to-mid production run

Deck coring and hardware-penetration moisture ingress typical of 1980s British GRP production cruisers severity: Medium affects: 1980s

Systems to check before you buy

Twin bilge-keel roots / hull-keel joint priority: offshore, coastal, liveaboard

Inspect both keel-to-hull attachment points for stress cracking, gelcoat crazing, or weeping; this is the single most common structural failure point on aging bilge-keelers.

Keel ballast condition priority: offshore, coastal

Iron ballast can corrode and rust-bleed through the keel seams over decades; check for staining, softness, or water intrusion into the encapsulation.

Auxiliary engine priority: motor, liveaboard, coastal

Many boats of this class are still on an original or first-repower diesel; check hours, smoke on start, mounts, and cooling before assuming it is serviceable.

Standing rigging and chainplates priority: offshore, coastal

Rig age is likely 20-40+ years with no service history on an unrestored boat; check chainplate-to-bulkhead attachment for crevice corrosion and hidden rot at the deck penetration.

Deck core and deck hardware penetrations priority: offshore, liveaboard, coastal

Moisture ingress around stanchions, cleats, and hatch frames is common on production GRP boats of this era and can lead to soft, delaminated decking.

How it fits your plans

Coastal: This is the boat's home ground: shoal draft and the ability to dry out upright on a falling tide suit UK and near-Continental tidal coastal cruising well.
Liveaboard: Interior volume is modest for a 30-footer of this era; workable for a couple on short stints but tight for long-term liveaboard.
Offshore: The moderate-displacement bilge-keel hull is seaworthy in open water but slower to windward and less efficient than a fin-keel offshore design; this class is a coastal compromise, not a blue-water passage-maker.
Weekending: Simple systems and forgiving, predictable handling make it an easy, low-drama weekend and family cruiser.

This guide is the class. A report is that hull. Paste the listing you're looking at and FairKeel grades every claim in it against what's known about the Seawolf 30 — where the evidence is thin, the red flags worth a second look, the costs likely to land in your first season, and whether the boat suits the plans you describe in a few short questions.

It won't read the photos or put a number on the boat — that's the $249 Deep-Dive, and for the real answer, a surveyor. It will tell you when a Deep-Dive isn't worth buying. Free, no account, usually a minute or two.

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