David de Villiers Interview – Aluminum Catamaran Design

We spoke with David de Villiers about catamaran design. David is especially interesting because he is at the forefront of a number of design trends including aluminum construction and the push away from condomarans and towards a focus on lightweight, efficient designs. We talk to him about his famous 62 foot ketch catamaran and his DVD 525 version which is being built all over the world currently. He discuses his time in South Africa under Dudley Dix, his transition to designing in New Zealand, and what he sees as the future for himself and the catamaran design world in general. Please visit his website ( www.devilliersmarinedesign.co.nz ) for additional information about David and get in touch with him about building an aluminum catamaran. Can you tell us a little about yourself? Yes sure. I am from South Africa originally. Whilst in my early teens my father, who was a medical […]

Derek Kelsall Interview

We spoke with legendary catamaran designer Derek Kelsall. We cover his history and innovations in catamarans design and construction such as the foam coring, KSS. We ask him why his designs and build techniques are so heavily criticized. He talks about what size of a catamaran that a couple or family should purchase and where catamaran design is likely to go in the next decade. Please find out more about Derek Kelsall on his website. You can email him to ask questions and purchase plans or built kit. Thanks for joining us, just start by telling us about yourself. Designing and boat building is my second career. I spent 10 years in survey work and in oil exploration that took me to Kenya, to Libya, and to Texas. It was in Texas that I built my first boat.. When I left school, I wanted to travel. I discovered hitchhiking and […]

Schionning Design Interview with Robert Quinn

We talk to Robert Quinn of Schionning Design about how their company is navigating Covid-19, their most popular models, and the future of catamaran design. We discuss the Arrow series, G Force, and Waterline / Wilderness designs. Robert tells us why their Arrow series is their most popular and why the Arrow 1200 is the most popular model. He talks about their most common build locations in Australia, Thailand, and South Africa, and their growth plans for the USA market. A big thank you to Robert and Schionning Design for participating in our series of interviews with catamaran designers, builders, and owners. Don’t exactly know why, but I think people are seeing them as escape pods. Robert on why Covid-19 has improved catamaran sales. To find out more information or to purchase design plans or a build kit, please visit the Schionning Design website. Tell us about yourself and how […]

Dudley Dix Interview on Catamaran Design

Below is our interview with Dudley Dix about his DH550 catamaran, 43 and 47 foot sisterships, and a future 38 foot version. He talks about catamaran design, why he is popular in Russia, the problems with reverse bows, and why, for most people, the ideal catamaran length is 38 to 40 feet. World renown for his beautiful and surprisingly fast designs, it was a great pleasure hearing directly from this naval architect. It’s bad to design a boat that looks fast and isn’t, but it’s great to design one that looks slow and is actually fast. Dudley Dix on yacht design Please contact Dudley for information about his plans or to purchase one of his build kits. His website is www.DixDesign.com Tell us a little bit about yourself. Okay I am South African born in Cape Town. My dad was a provincial champion in Flying Dutchman. We lived on the […]

Introduction of Catamaran Designer Richard Woods – Interview # 1

Diane spoke with Richard Woods, a long time catamaran designer. Richard designed the catamaran that Diane circumnavigated on with her family, a modified Woods 40 Meander. Richard has been designing for a very long time all the way back to the 1970’s when working with Derek Kelsall and James Wharram. He has designed more boats than he can recall mostly in the 8 to 40 foot range. You can find out much more about him on his website SailingCatamarans.com. You can purchase designs to build your own Woods catamaran from his website here as well. We will be doing a series of interviews with Richard Woods about different catamaran design features to help educate buyers and broaden their understanding of models beyond the traditional charter catamaran experience. How did you end up in catamaran design? It is really difficult to answer. It has been my life. It started with my […]

Catamaran Design Formulas

Part 2: With permission from Terho Halme – Naval Architect While Part 1 showcased design comments from Richard Woods, this second webpage on catamaran design is from a paper on “How to dimension a sailing catamaran”, written by the Finnish boat designer, Terho Halme. I found his paper easy to follow and all the Catamaran hull design equations were in one place.  Terho was kind enough to grant permission to reproduce his work here. Below are basic equations and parameters of catamaran design, courtesy of Terho Halme. There are also a few references from ISO boat standards. The first step of catamaran design is to decide the length of the boat and her purpose. Then we’ll try to optimize other dimensions, to give her decent performance. All dimensions on this page are metric, linear dimensions are in meters (m), areas are in square meters (m2), displacement volumes in cubic meters […]

Catamaran Hull Design

Part 1: Notes from Richard Woods Since the America’s Cup experimented with going multihull, there’s been a lot of interest in catamaran performance and the catamaran hull designs that define performance. Many guys are investigating whether to buy a catamaran or design and build their dream boat. Let it be said here that building a large catamaran is not for the faint of heart. People begin building 100s of boats a year, yet few are ever completed, as life always seems to have a way of interfering with a good boat build.  Never the less, since the rest of this website is about selecting and buying a boat, it only seems fair to have at least one webpage that covers catamaran design. This page contains notes on boat hull design goals and an accompanying page from Terho Halme has mathematical formulas used in actual catamaran hull design. It has become […]