I was wondering if anyone has used a SWATH system on a Wharram style hull? and anyone ever done sandwich core instead of Fiberglass over wood?

“For Eric [Jones], I developed what I call the ‘egg box principle,’, making a backbone out of plywood and timber framing to the exact shape of the keel, stem and stern profile of the hull and slotting bulkheads on to this. It removed the heavy building base structure out of the cycle; the fixed backbone and bulkhead structure could be stood up on any type of floor and squared up with a string through the centreline. The bulkheads would be leveled with wedges to the floor.…

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Hi Everyone,

We have progressed into our next phase of R&D for our Narai Mk IV wooden catamaran build: building a 1:10 scale model of one hull. Hanneke Boon strongly suggested we build a model; she’s been building them herself since she was 14 years old. For the next few months, we’ll be sharing Building Logs to establish good practice for documenting the real build, which we anticipate will…

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1. Just got an email from "Ronald Morris". Smells like a scam artist and I noticed he has just joined the forum with no photo or personal details. Can we send him to Truth Social or perhaps X, where he belongs?

Kia ora crew, here's the details if you're interested, nga mihi.

Wharram Narai Mk4 Cutter rigged sloop

$120k US

42ft (12.8m) 

20ft beam

3ft draft

7 tonne approx



Built from high quality marine grade aluminium

Built in South Africa by naval architect 1996



NZ registered

Papeetized : French Polynesian - Local tax paid



Recently repainted decks, centre cabin, cockpit and interior portside

Tiller and wheel steering… Continue