FairKeel → Buyer's guides → Wharram Oro
1968–present · designed by James Wharram (later variants with Hanneke Boon) · built by Wharram Designs (plans) / owner-built
Classic-era James Wharram Polynesian-inspired ocean-cruising catamaran, ~40 ft. 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. Plywood construction from plans sold by Wharram Designs; later builds use epoxy throughout, earlier builds may have older resin systems. Wood-composite hull is repairable anywhere with hand tools, epoxy, and glass cloth — a major asset for extended-range cruising. Designed for ocean cruising at modest cost in the 40 ft classic-Wharram size bracket.
This is a general read on the Wharram Oro 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.
Highest-risk system. Inspect resin coating condition (early hulls may have polyester or other older systems), plywood-stitch joint integrity, glass-sheathing delamination around through-fittings and waterline. Moisture-meter survey of every hull section is mandatory.
Hulls lashed to crossbeams. Annual inspection and replacement every 5-10 years with modern synthetic line. A failed lashing offshore is catastrophic.
Oro rig varies — classic gaff on earlier hulls, schooner or twin- mast on some. Consult Wharram Designs or experienced Wharram riggers; class-specific sail cuts.
Twin outboards (10-15hp) or twin small inboards (10-20hp diesels). Verify configuration. Outboard wells are plywood-moisture hotspots; inboard installs require structural-laminate inspection.
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 Oro — 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.
Run a free report on your listing →See something that doesn't look right? We'd love to know — email us about the Wharram Oro →