photo of catamaran Soul Phang Gna bay
Chincogan 52 "Soul" in Phang Nga Bay
Barefoot 40 catamaran for link to Catamaran designs page
Trimaran Trilogy for Link to Trimarans designs page

What we do

Multihull yacht design and construction has come a long way since I created my first design in 1986. Evolution never ceases in nature and there’s no reason for it to cease in yacht design and manufacture either. 


Our journey starts with asking questions and imagining whats possible.

 We craft the curves, finesse the forms. We bring in the technicians, the mathematicians, sometimes the magicians. We call up the makers and the movers and shakers.


We’re here to bring you the latest in design technology in hull shapes, in styling, in engineering, to connect you with the products and the services that will streamline the build process and bring your own yacht life with the most cost effective build methods we can conjure. 


Browse the designs. Check out the people and the companies we’re partnered with in The Partners Network.


Join us on our journey, or let yours begin when ours is done.

What you’re imagining just might be possible.

And if it’s not we can probably make some magic happen anyway.


Tony Grainger

Photo of yacht designer Tony Grainger
Tony Grainger
Photo of racing trimaran ATL/Oaks

Not the first design but one of the first. And she's been first in fleet more than once. She's been called ATL/Oaks. Dux Nuts and Moving Finger. She'll always be called one of my favourites.

Livewire 28 Comes Alive

Plans and quotes to build available now

Sports cats are the fun zone for sailing. We've created the Livewire 28 to bring sports cat sailing technology up to the minute in a boat that has the performance, the style and a range of build options to suit you time frame and your budget.


Check out the Livewire page here:


And the Livewire Plans Page here:




Multihull Design Shop is Live Now

It's a one stop shop where you can where you can browse and purchase layout drawings, sail plans and technical information multihull designs from Grainger Designs and Rocket Factory Trimarans. 

You can pay for the design information you need with Paypal and you'll receive a link that will allow you to download the plan or the booklet you've purchased in Pdf format. 

The site address


Logo for Multihull Design shop to link to shop page