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Wharram Pahi 42

1976–present · designed by James Wharram + Hanneke Boon · built by Wharram Designs (plans) / owner-built; some yard-completed examples

James Wharram + Hanneke Boon Polynesian-inspired ocean-cruising catamaran — the workhorse of the Pahi cruising line. Plywood-epoxy stitch-and-glue construction from plans sold by Wharram Designs Ltd (Cornwall, UK); most hulls are owner-built by amateurs over 3-10 year timelines, with a small number completed by specialist yards in Asia and the Mediterranean. Open slatted bridge deck (no solid panel), deck-stepped masts supported by lashings, hulls lashed to crossbeams with synthetic line. Wood-composite hull is repairable anywhere with hand tools, epoxy, and glass cloth. Designed for cost-effective ocean cruising with multiple documented circumnavigations on the class.

This is a general read on the Wharram Pahi 42 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: Multihull Cat
Rudder: Transom Hung
Mast step: Deck Stepped
Hull construction: Wood
Bridgedeck: Open
Production: 1976–present
Built in: UK (plans) / variable (owner-built)

What the Wharram Pahi 42 is known for

Easily repairable anywhere — wood-composite plywood-epoxy + glass cloth hull can be patched in beach or backyard with hand tools and locally-available materials. Major asset for remote cruising vs. production fiberglass cats requiring yard infrastructure.
Lashed-not-bolted hull-to-crossbeam connection is intentionally flexible — distributes load gradually, avoids bolt-fatigue failure common to rigid catamaran connections.
Proven ocean-cruiser at modest cost — multiple documented circumnavigations. The Pahi 42 is one of the most thoroughly voyaging-tested designs in the Wharram catalogue.
Owner community is highly engaged + well-documented — Wharram Designs has supported builders since the 1960s; institutional knowledge of class-specific issues is deep.

Known trade-offs

Quality varies hull-by-hull — a meticulous owner-builder produces an exemplary boat; an undercapitalised first-time builder produces a structurally suspect hull. Build provenance + materials documentation are non-negotiable. Build-time hidden defects (poor stitch alignment, inadequate glass laminate counts, undersized hardware mounts, missed epoxy hot-coats) can persist for decades until stressed.
Plywood-epoxy hulls have a finite lifespan dominated by moisture ingress; an old Pahi 42 with weak epoxy schedule history may be at end-of-life regardless of cosmetic condition.
Wide beam + open bridgedeck = marina-unfriendly + weather-exposed living. The Wharram lifestyle suits a specific kind of cruiser; it is not a Lagoon or Leopard equivalent.
Resale market is thin and niche; expect long marketing periods and limited buyer pool when selling.

Age-related quirks to expect

Owner-built quality variance — every Pahi 42 is effectively bespoke; survey must assess THIS hull, not class priors severity: High affects: all (owner-built)

Plywood-epoxy hull moisture susceptibility — breached epoxy + persistent moisture = plywood rot in affected area severity: High affects: all (age + maintenance-driven)

Lashed crossbeam attachment — synthetic-line lashings need annual inspection and replacement every 5-10 years severity: Medium affects: all (architectural)

Wharram-specific gaff or soft-wing rig — riggers unfamiliar with Wharrams may quote inappropriate generic-sloop solutions severity: Low affects: all (architectural)

Variable interior layouts — some Pahi 42s have minimal accommodation (purist), others have extensive owner modifications affecting weight and trim severity: Medium affects: all (owner-customised)

Systems to check before you buy

Hull-laminate + epoxy condition priority: offshore, coastal, liveaboard

The single highest-risk system on any Wharram. Inspect epoxy hot-coat condition (UV-driven chalking), plywood-stitch joint integrity at hull seams, glass-sheathing delamination around through-fittings, waterline, and beam-saddle areas. Moisture-meter survey of every hull section is mandatory. Builder logs + materials provenance (plywood grade, epoxy schedule, hot-coat history) matter enormously — often unavailable for older hulls or hulls that have changed hands multiple times.

Lashings + crossbeam attachment priority: offshore, coastal

Hulls are joined to crossbeams with synthetic-line lashings, not bolts. Lashing design is intentional (distributes load gradually) but lashings need annual inspection and replacement every 5-10 years depending on UV exposure and line material. A failed lashing offshore is a catastrophic failure mode unique to Wharrams. Check crossbeam saddles + lashing channels in the hull tops for wear and moisture ingress.

Wharram rig — mast, sails, rigging geometry priority: offshore, coastal

Wharram designs use a class-specific rig (gaff or soft-wing geometry) not equivalent to a generic sloop. Standing rigging geometry, mast support via lashings, and sail-handling layouts are Wharram-specific. Consult Wharram Designs or experienced Wharram riggers; generic-yard quotes are often inappropriate. Soft-wing sail versions involve specialist sailmaking knowledge.

Auxiliary propulsion (twin outboards or twin small inboards) priority: offshore, coastal, liveaboard

Pahi 42 propulsion varies by hull — twin outboards (10-20hp in outboard wells) or twin small inboards (8-15hp diesels). Verify configuration. Outboard wells are a plywood-moisture hotspot; inboard installations involve cutting structural plywood and should be inspected for surrounding laminate integrity.

How it fits your plans

Offshore: Designed for it. Multiple documented Pahi 42 circumnavigations. Caveats: owner-built quality variance dominates the risk calculus; lashing inspection regime + plywood-epoxy moisture management are non-negotiable. A well-built Pahi 42 is a credible ocean cruiser; a poorly-built one is dangerous offshore.
Coastal: Workable. Wide beam + shallow draft = good shoal-water cruiser. Marina-fit can be a problem (wide beam exceeds many slip widths).
Liveaboard: Strong for the right buyer. Two-hull layout gives privacy + space for couples. No solid bridgedeck means no enclosed saloon between hulls — living is in the hulls + a deck-tent / hard-top over the open bridge platform.

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 Wharram Pahi 42 — 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 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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