More cool drinks, less battery drain.

If there's such a thing as a legendary figure in the design of boat refrigeration systems it probably has to be Mal Betts of Iceer in Queensland Australia. Mal's refrigeration systems are renown for low battery consumption and they come highly recommended by a host of boat owners and sailing masters including Julian Way from Catchus (recently changed hands) and Gary Martin, ex Tusk, ex Flat Chat, ex Cutloose and currently sailing master of MC60 Dragon.


Check out Mal's web site for good advice on your new or replacement refrigeration system.

Ben Kelly's Quantum loft joins our Partners Network

We're pleased to welcome Ben Kelly's Quantum sail loft on board with our Partners Network. Ben jumped on board Trilogy 16 years ago at the tender age of 22 years and was a key driving force in Trilogy’s highly successful racing career.


Ben's roll call of boats he's made sails for reads like a who’s who of high profile multihulls on the Australian racing circuit.

In our own design range Ben has made sails for AYS Raider, Mad Max/Indian Chief, Dux Nuts, Trilogy, Barefoot (the green one), Turning Point and many more. 

Ben is happy to quote for sails, racing or cruising for any part of the world.

See the Partnership Network page here.



Optimising Hull Lines for Performance

We have a new 8.5m Sports Cat in the design phase. It draws strongly on the hull lines from Mad Max and we've prepared a brief article discussing the hull shape and the effects such features as rocker line and hull beam have on performance.

At the end of the article we have published the hull lines of both boats for comparison.

The article is in the LAB and you can read it here.

Rethinking cross beam design for larger and one off trimarans

In a previous article we dealt with the design of cross beams for folding production trimarans.

In a new article we've posted in the LAB we've looked at whether using a similar concept to design and build the beams for one off trimarans might have some advantages including a saving in cost and weight.

And maybe a better aerodynamic profile as well.

See the article here:

TR52 and TR60 Trimarans get new helm station arrangement and revised interior layouts.

We've come up with a much better arrangement for the helm stations on the TR52 and TR60 trimarans. They're a little bit further forward from their original position but now are open to the main cockpit area and there is easy access for the helm person to cross from one side of the boat to the other.


Forepeak layout in both boats also improved with the 60 offering the options of two private cabins and a reasonable spacious bathroom up forward.


See the new layouts on the trimarans pages:

TR52 link here

TR60 link here


Rethinking cross beam design for larger and one off trimarans

TR36 is a new addition to the trimaran range

TR36 is our latest addition to the TR series trimaran range. It's a scaled down version of the TR42 and it's available with aft cabin or open cockpit. See more details on the TR36 page.

TR42 Pricing available now.

We have a specification and price for a custom build for the TR42 ready to sail. The build is foam/epoxy with carbon beams including a carbon rig and three sails. It's not as expensive as you might think.

Let us know if you're interested. We'll put you in touch with the builder and we can talk details.

TR40 Morello comes to life in the Carribean

Larry Ketten began his TR40 project in Harbor Springs Michigan in 1995. It’s obviously been a labour or love. Morello is built in strip plank cedar and beautifully finished. After a 20 year build Morello is now enjoy the sun, the breeze and a fair share of salt spray in the Carrbibean. Morello was recently featured in Multihulls Quarterly. You can see the article here.

Larry kindly sent us some great photos of the boat and some editorial content to go with it. We’ll be posting it on the site soon.

Rethinking cross beam design for folding trimarans

We've come up with a new way of building beams for production folding trimarans which makes significant improvements to the structural features of existing beams while retaining ease of construction. 

You can see the new design and read about the issues that inspired us to come up with the new design.

The article is in three parts with links from out topics page. You can find the Topics Page here:


Surf to City 2016

Three Grainger Designs 1,2,3 across the line Surf to City inshore division.

Mad Max, Boat Works and Barefoot were first, second and third across the line in that order in the inshore division of the Surf to City over the weekend. 

Mad Max

Boat Works


Two new articles added to the topics pages

Two new articles have been added to the topics pages. The first is a plot of the known weight compared to length for catamarans and trimarans taken from known or reliable data from 109 boats.

These plots are useful to know realistically what weight you can expect for a given level of construction technology. See the full article here:


The second article was a bit more difficult because there is not a lot of reliable data to work with and build hours vary for a whole host of reasons. But builders of new projects want to know how many hours are going to be involved so we've done our best to come up with some numbers for you to work with and we discuss some of the reasons build hours vary so much. see the article here

Strong fleet predicted for King of the Gulf Regatta 2016

Taeping on video

Taeping features in some spectacular drone footage shot from a DJI Phantom while she was approaching Tutukaka in the 2015 New Zealand Coastal Classic.

The footage captured in 4k by Incredible Motion NZ and you can find it in two parts at these links:

Taeping is now for sale and presents a great opportunity if you're looking to slip into a slippery set of hulls all ready to go.

Contact the owner Dave Andrews <>

barefoot at hammo

The great shots from Julie's camera just keep coming. She snapped this pic of Warren Innes's Barefoot (the boat name not to be confused with our Barefoot model range) racing at Hamilton Island Race Week last month.

For more great shots check out Julie's web site:

mid sized (OFFSHORE RACING) multis UPDATE


Barefoot Sports cat at Hammo

Hamilton Island Race Week 2015

Racing can be hard work, especially if there's a bit breeze, but crew of Barefoot found the time and energy to chill out after the racing. 

APC MAd Max in full flight at Hamilton Island Race Week 2015

Men on a mission. Crew of APC Mad Max don't like to see carbon fiber, fibreglass, sail cloth or any other sort of stuff like that between themselves and the finish line. Intruders beware - they have no brakes!

Keeping cool at Hammo

Crew of Warren Innes's sports cat Barefoot  (not to be confused with our cruising cats of the same name) doing it tough on the foredeck in the middle of Hamilton Island race Week.

The Boats Works racing at Hamilton Island Race Week 2015

The Boat Works performed consistently well but was not sailing up to her potential given her past racing history. She faced some tough competition from Mad Max and Morticia and placed third across the line in the the first five races, finishing 6th overall in the fourteen boat fleet.


APC Mad Max racing at Hamilton Island Race Week
APC Mad Max racing at Hamilton Island Race Week

August 19th 2015

With the first three races sailed at Hamilton Island Race Week APC Mad Max continues to set the pace for boat speed, taking line honours from Morticia in all thee races but failing to snatch the OMR honours.

Max had an elapsed time margin over Morticia of 9 minutes in Race 1, nearly six minutes in race 2 and just over three minutes in race 3. 

Max is currently in 4th place on the OMR points table with Morticia on top ahead of Chillpill and Fantasia. The Boat Works is four points behind in fifth place.

Today is a lay day but racing resumes tomorrow with good breeze forecast right through to the weekend.


Catamaran Barefoot racing in Queensland waters

Warren Innes sent us a couple of great pic’s of his recently refurbished Ocean Sports 11 competing in Port Douglas Race Week with a gung ho crew of F18 sailors.

Warren reports; “We were soundly beaten by Malice but that was expected as he is nearly a ton lighter. I learned to sail the boat fast with the crew pushing me out of conservative mode and we were getting consistent 14's to weather and topping out at 25 knots peak speed, The seas were two meters all week and we just creamed the expensive big monos to windward!!” 

“It is a very easy boat to sail, Even solo from Cairns to Airlie which I did a few weeks ago was easy with the tillerpilot doing all the steering.”

Warren tells us that future plans for the boat possibly include Airlie Race week and the Pittwater to Coffs Race.

what makes trimarans fast?

Link for publication what makes trimarans fast
Photo of catamaran Mad Max racing in the King of the Gulf Regatta

What Makes Trimarans Fast? is  not too technical article that discusses hull shapes and platform configurations for trimarans, primarily relevant to trailerable trimarans but relevant to trimarans of all sizes.

Click on the link below to read, print or download the article as a Pdf.

Click on the image at left to read the article online on the Rocket Factory web site.

BAY TO BAY 2015 

Posted 4th May 2015

It's another fine win for Mad Max in the Bay to Bay Race which according to skipper George Owen was "slow and frustrating". In the post on this event last year we mentioned that Tony Considine has lost count of the number of times Max has won the event.

Well whatever that number; just add one more.

Another fabulous close up shot from Julie Geldard.

Catamaran APC Mad Max racing in the Surf to City Race 2014


Posted 10th March 2015

cut loose gets a refit

Posted 27th Feb 2015

Photo of Catamaran Cut Loose at Inskip Point

55’ Catamaran Cutloose has just emerged from an extensive refit carried out at Boatworks on the Queensland Gold Coast.

The work was carried out by Jamie Morris who was the original builder of Cutloose back in 1998. Cutloose was built in Western Red Cedar strip and Jamie reports “structurally the boat is as good as the day she first came out of the shed all those years ago”.  

Cut Loose sports new 53HP Yanmar engines and a carbon main and genoa built by Ben Kelly at Quantum sails in Brisbane.

Cut Loose also has new electronics, cordage and hatches.

Owner Bill Shead reports that the new sails, combined with the boat’s massive righting moment (she’s 9.5m wide) give the boat a huge power boost.

Bill is quite passionate about Cutloose. He uses the boat to make regular trips between the Australian mainland and Lord Howe Island and has clocked up over 70,000n.m. in the boat. 

Bill reports:

Cutloose is a fabulous ocean going boat, fast and stable, especially in rough seas.

I have used it to carry freight in my numerous voyages from mainland Australia to Lord Howe Island and it has performed very well in this capacity.

In 2013 I sailed her from Lord Howe Island to Hobart for the Wooden Boat Show and encountered 48 knot winds going south, fortunately from the north!

We took no seas on board and  the boat was safe and seaworthy at all times.

I have sailed in all conditions in the Tasman Sea on my voyages and the only weather that frightens me is big electrical storms."