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Wharram Tangaroa

1960–present · designed by James Wharram · built by Wharram Designs (plans) / owner-built

Early classic-era James Wharram Polynesian-inspired catamaran — among the foundational Wharram plans sold to amateur owner-builders. V-section hulls (the original Wharram hull form), open slatted bridge deck (no solid panel), deck-stepped mast supported by lashings, hulls lashed to crossbeams. The class is historically significant — James Wharram's own early voyages were on a Tangaroa-type design. Plywood construction from plans; surviving hulls are 50-60+ years old and have typically had multiple owner refits. Wood-composite hull is repairable anywhere with hand tools — though early hulls predate modern epoxy and may have older resin systems.

This is a general read on the Wharram Tangaroa 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: 1960–present
Built in: UK (plans) / variable (owner-built)

What the Wharram Tangaroa is known for

Easily repairable anywhere — wood-composite hull can be patched with hand tools and locally-available materials. Foundational Wharram philosophy.
Historically significant class — James Wharram's own early voyages helped establish the Wharram catamaran philosophy on Tangaroa-type hulls.
Wharram Designs continues to support owners of classic hulls.

Known trade-offs

Quality varies hull-by-hull and any surviving Tangaroa is 50-60+ years old with extensive owner-modification history. Build provenance is typically incomplete.
Early hulls predate modern epoxy systems — original polyester or other resin coatings may have been overlaid with epoxy in later refits, or may not have been. Material history matters enormously.
Plywood hulls have a finite lifespan; a 50-60+ year-old Tangaroa with weak coating history may be at end-of-life regardless of cosmetic condition.
Resale market is essentially nonexistent; classic Wharrams trade between enthusiasts at modest prices.

Age-related quirks to expect

Owner-built quality variance — every Tangaroa is bespoke; survey must assess THIS hull. Early hulls predate modern epoxy practice. severity: High affects: all (owner-built)

Original-era plywood + older resin systems — pre-epoxy hulls used polyester or other less-durable resins; check for material upgrades severity: High affects: 1960-mid-1970s original builds

Plywood-resin hull moisture susceptibility — 50-60+ year hulls have had decades of moisture exposure severity: High affects: all (age-driven)

Lashed crossbeam attachment — original natural-fibre lashings on some early hulls have been replaced with synthetic line severity: Medium affects: all (architectural)

Classic Wharram gaff rig — small, simple, class-specific severity: Low affects: all (architectural)

Systems to check before you buy

Hull-laminate condition (plywood + resin system) priority: coastal, liveaboard

Highest-risk system on any classic Wharram. Inspect resin coating condition (early hulls may have polyester or other older systems — verify what's been applied over the boat's life), plywood-stitch joint integrity. Moisture-meter survey of every hull section is mandatory. Build provenance is rarely complete for hulls of this age; the survey IS the documentation.

Lashings + crossbeam attachment priority: coastal, offshore

Hulls lashed to crossbeams. Annual inspection and replacement every 5-10 years with modern synthetic line. Verify current lashing material.

Wharram classic gaff rig — mast, sails, rigging priority: coastal

Classic-era Wharram rig is simple gaff geometry. Consult Wharram Designs or experienced Wharram riggers; sails for classic V-hull Wharrams have specific cut requirements.

Auxiliary propulsion (small outboard) priority: coastal

Typically a small outboard (5-10hp) on a transom bracket or in a well. Outboard wells in plywood hulls are moisture-ingress hotspots.

How it fits your plans

Coastal: Designed for it. Classic Polynesian-inspired coastal cruiser; surviving hulls reflect decades of owner stewardship — quality varies wildly.
Liveaboard: Possible in protected waters; minimalist by modern standards. Living is in the hulls; deck-tent over open bridge platform.
Offshore: Original-era class accomplished some notable voyages in the hands of experienced sailors, but offshore use of a 50-60+ year-old Tangaroa is high-risk without major refit and rigorous laminate verification.

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 Tangaroa — 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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