John Shuttleworh Yacht Design.

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Designs.

New Designs.

There are several new designs which are not listed here. Go to What's New and scroll down through the news items to find recent launchings and other design images and news.

There are also more designs and images of designs shown in Images.

Read about the philosophy and technical details behind the designs in Articles.

Articles about a selection of our designs.

70 Foot Cruising Cat

70 ft Cat just launched
Constructed in Cowes, England to the full American Bureau of Shipping approval for plans and building, this 70 ft. cat has been designed to the highest standard, for performance, strength, weight carrying capacity, and comfort. Mike Schicht was chosen to head the building team because of his extensive composite building experience using vaccuum bagged laminates. Read more.

Reflections on the Design of "Brittany Ferries G.B." 65 ft. Racing Trimaran for the two handed transatlantic race

Brittany Ferries

A talk by John Shuttleworth at the Multihull Offshore Cruising and Racing Association A.G.M., January 1982.

Various articles have been published about the boat over the last year explaining many of the design features (see Multihulls International Dec 1980). So rather than go over old ground I thought tonight I would just outline the general design principles and then concentrate on the outrigger design and introduce some new concepts regarding the relationship between wetted surface area and speed. Then I would like to show why Brittany Ferries G.B. was faster than Elf Aquitaine and finally have a look at the future and try and indicate the direction I think design is going to take. Read more.

The design of a 52ft. Aerorig cruising catamaran

Aerorig52 click on thumbnail for larger picture
In July 1995 I was asked by Dr. Ian Munro to design a new large cruising catamaran with an Aerorig. Dr. Munro has retired and and intends to sail around the world over a period of 10 years with his wife as crew. They have been used to a very comfortable standard of living and wish to cruise without a crew to help, and yet want to have many of the comforts of home, like a washing machine, large galley with refrigeration, and air conditioning.... Read more.

"Design develoments in high performance cruising catamarans. From the Spectrum 42 to the Dogstar 50." 2002

Pulsar 50 click on thumbnail for larger picture
Beyond the Tektron 50. In 2000 I was approached by Peter Bryant to design a new up do date version of the Tektron 50, He wanted a cruiser/racer that could beat the current 40 ft racing trimarans racing in Britain....... Read more.

The same article translated into German can be found at....

Nachfolger der TEKTRON 50 .. DOGSTAR 50

... oder wie man dem schnellsten 50 Fuß-Kreuzer der Welt Beine. John Shuttleworth (bersetzung von Klaus Ehm fur MEHRRUMPFBOOTE, Multihull Deutschland)

Tektron 50

Tektron50-photo click on thumbnail for larger picture

This summer sailors on Lake Ontario will see an exceptional new multihull take to the water. This Catamaran, which has been built near Toronto, pushes back the boundaries of performance cruising further than has ever been attempted before. Furthermore this boat is intended as a test bed for an exciting new range of yachting instruments of manufactured by Tektron Equipment Corporation, and will therefore provide more data than has ever been gathered on a multihull before, in terms of rig and hull stress against performance on all points of sail, and sea states. After tuning up on Lake Ontario, the Tektron 50 is entered in the 1988 Quebec-St Malo race. Read more



Spectrum 42

Toucan-sailing Timshel_at_dock click on thumbnail for larger picture
Adapted from and original article in Multihull International 1985

The initial response to this cat in my original article in Multihull International has been excellent. This boat is built with the same high tech concepts as my best racing designs, many new techniques were developed to speed up the building process. 15 years on from when this boat was first launched, several have been built and a number have made ocean crossings. We are all very excited by the performance. She meets all my expectations. Pitching is very well controlled, and the boat trims slightly bow up on a reach as designed.... Read more.


PowerShuttle 40

POWERSHUT40 click on thumbnail for larger picture

The new Powershuttle 40 has been designed as an economical, environmentally friendly catamaran. Utilising the new 90 or 130 HP Honda 4 stroke outboards extraordinary fuel economy can be achieved when compared to conventional power boats, and yet the Powershuttle 40 has more accommodation, including a huge shaded cockpit, and dive platform aft. The dive platform hinges down to the water to provide easy access. Steps up the transom make boarding easy. Read more.


35 Foot Catamaran for Home building "Two Hoots" design

Malahini click on thumbnail for larger picture

Many people wonder about what the benefits of ocean races are to ordinary sailors. Races like the OSTAR and La Route du Rhum, where enormous sums of money are spent on the latest technology, materials, and systems, to assist the shorthanded sailors to sail the boats as fast and as safely as possible. Yet, in the fast moving world of multihulls I believe that it is possible to see a direct correlation between the money spent on developing high-tech race boats and cruising designs. This catamaran is an excellent example of such a boat... it is the payoff for the cruising multihull. Read more.


Tektron 35

Tektron35 click on thumbnail for larger picture
One of the main aims of this new design was to produce a boat boat with comfortable living accommodation space with as little sacrifice as possible to sailing performance, windward ability and seakeeping qualities . This 35 ft Catamaran exemplifies the new generation of performance cruising multihulls, designed and engineered with the latest thinking on structures and computer designed hull forms. The boat is nevertheless suited for skilled amateur construction. the first production version is currently under construction in Canada by Eugene Tekatch, who built the Tektron 50. Read more.
Read the article from Mulihulls world on the Tektron 35

Tek 35 specifications.

T35-aft-view-thumb click on thumbnail for larger picture

"Shuttle 31 Catamaran."

The story of building 2 Shuttle 31 catamarans." 2002.
fig-16 thumbnail click on thumbnail for larger picture

In July 2000 I received an order for a set of plans for a Shuttle 31 to be built in Western Red Cedar strip planking with Epoxy and glass reinforcing. I had been in correspondence with the teacher of a group of young people at a Waldorf (Steiner) school in Switzerland. This teacher, Thomas Wolf, intended to head up a team of 12 students with the aim of building two 31 ft cats in less than two years. At the start of the project the students wrote to me "We are twelve students at the age of 16-17 years. We attend a Waldorf school in Muttenz, Baselland. Two afternoons per week we work at the boats. While our schoolmates attend special courses like working on a farm, we will solely concentrate on building the boats. Also during the holidays we will sacrifice some weeks for the project." Read more.


30 Foot Racing Tri "N'aia" for Mike Reppy

Naia After winning class 3 in the 1988 CSTAR in Damiana, the 42ft Tri. I had designed for him in 1982, Mike decided to try and raise money for a bigger racing boat. In the meantime he would build a 30ft racer as a test bed for some new ideas. Initially we started with and all out day racer for San Francisco Bay, but soon Mike decided that he wanted to do the Transpac as well, and that the boat should be demountable so that he could ship her back from Hawaii.

I had already designed two successful 30 ft offshore racing trimarans, Caledonia, which had knocked over 6 days off the transatlantic record when winning class 6 in the '88 CSTAR, and Shockwave. Shockwave was definitely faster than Caledonia, but when Mike talked about a new boat I had a hunch that by doing some thorough research and incorporating my latest ideas on rig efficiency, we could make another significant leap in performance. Read more.


Designers Comments on "Shockwave". 30 ft Racing Trimaran for the around Britain and Ireland race.

Shockwave
Kenmore (sister ship) thumbnails

Built for John Fowler by Dave Irving at Queen Anne's Battery in Plymouth in vacuum bagged polyester and E glass, with carbon reinforcing in the main hull, Shockwave is designed to win the 30ft Class in the forthcoming Round Britain & Ireland Race. Shockwave is a development of the extremely successful Caledonia which was amateur built and sailed to a record Class VI win by my design assistant, Rod Stuart, in the 1988 C-Star. Read More.


  • Ian Holt review of the Lynx 8 metre Micro multihull
  • lynx_thumb.jpg Part 1 (180k)
    Part 2 (147k)
    Lynx Study Plan (129k)
    Last updated 20th Sept. 2010.