Purchasing new hardware? Read our latest product comparisons

Adastra one-off luxury trimaran is in the works


July 1, 2011

The Adastra is a one-off luxury trimaran, currently under construction in China (Image: John Shuttleworth Yacht Designs)

The Adastra is a one-off luxury trimaran, currently under construction in China (Image: John Shuttleworth Yacht Designs)

Image Gallery (10 images)

Some readers may remember the incredible-looking biodiesel-powered Earthrace trimaran. Originally designed to circumnavigate the world, it ended up being donated to the Sea Shepherd Society, and was promptly rammed and sunk by a Japanese whaling ship. Well, while we may no longer have it to gawk at, a one-off watercraft that could almost be considered its gigantic, luxurious sibling is currently being constructed in China. Behold, the Adastra.

The 16 by 42.5-meter (52.5 by 139.5-foot) yacht was designed by John Shuttleworth Yacht Designs and is being built by McConaghy Boats, for Hong Kong residents Anto and Elaine Marden.

While Shuttleworth acknowledges the legacy of vessels like Earthrace, he considers them to have been "stripped out record breaking machines." Transforming that basic form into a luxury yacht was a process that reportedly took five years (so far), including water tank tests, and the use of a scale radio-controlled model. It is now said to be nearing completion.

Although not intended to run specifically on biofuel, the Adastra is nonetheless designed for fuel-efficiency, which mostly involves keeping it as lightweight and streamlined as possible. The superstructure, for instance, is made from carbon fiber with a honeycomb core, while the hull is composed of a glass/Kevlar foam sandwich material. The oak cabinet panels also have honeycomb cores, while the custom hatches, portlights, ladders and hinges are all carbon fiber.

The yacht is powered by a main Caterpillar C18 engine, putting out 1150 hp at 2300 rpm, and two Yanmar outrigger engines, which each manage 110 hp at 3200 rpm. Fuel economy is estimated at 90 liters (24 U.S. gallons) per hour at 13 knots, or 120 liters (32 gallons) per hour at 17 knots. It should have a top speed of 22.5 knots, and a range (at 17 knots) of 4,000 miles (6,437 km).

Up to nine passengers and six crew should be comfortable, in a full-width master cabin, guest cabins, and crew accommodations. The yacht will also feature a galley, lounge area, main dining area, navigation station, and a pilot house. Interior design is being handled by Jepsen Designs of Hong Kong.

The Mardens and their privileged friends will also be able to enjoy a foredeck sunbed, an aft deck sofa, bar area and dining area, and a diving platform that doubles as a garage door for one of two tender boats.

There's no word on its price, but other details are available on the John Shuttleworth website.

Source: Bornrich

About the Author
Ben Coxworth An experienced freelance writer, videographer and television producer, Ben's interest in all forms of innovation is particularly fanatical when it comes to human-powered transportation, film-making gear, environmentally-friendly technologies and anything that's designed to go underwater. He lives in Edmonton, Alberta, where he spends a lot of time going over the handlebars of his mountain bike, hanging out in off-leash parks, and wishing the Pacific Ocean wasn't so far away. All articles by Ben Coxworth

very distasteful, gross, excessive,

Bill Bennett

\"promptly rammed and sunk by a Japanese whaling ship\"

Why not say: \"Sunk after a collision with a whaling ship\" and leave your bias out of it?

Paul van Dinther

"very distasteful, gross, excessive"

Or none of the above - it's unquestionably a thing of beauty.

Keith Reeder

fantastic,i want one

Tutu Sevn

Paul, that\'s not \"bias\", that\'s an accurate description of an historical event. Would you have the attack on Pearl Harbor be described as \"the clash of forces at Pearl Harbor\" instead?


What a beautiful hunk of indulgence, needs a heliport to escape marauding Japanese pirates though.

Yeah, alcaide, that was one miracle for the dark side. That 18-knot, 628DWT trawler and her crew of crusty Japanese tars hunted down that 78-foot wave-piercing trimaran powered by two 540hp Cummins MerCruiser Diesel engines on the open seas and when their water canons couldn't sink it, they spun around and rammed it in cold blood.

Even with Sea Shepard's great PR operation and most of world opinion on their side, the Australian Maritime Safety Authority doesn't agree with your rewrite of facts.


alcalde - July 2, 2011 @ 02:29 pm PDT--- True but. One should expect that sort of thing when engaging in acts of piracy.


Well, I realize it was the SeaShepherd video I have seen instead of the Japanese whaling video version, but it sure looked to me like the Ady Gil was out of fuel and a sitting duck, out of the path of the Japanese ship, and that Japanese ship turned ever so slightly right into it. Some accident. Can\'t understand how authorities or anyone else can see something right before their eyes and declare it simply \"a collision\"...


The Ady Gil on Whale Wars, did not appear to perform that well. @Keith Reeder funny, pick one or the other, lol


Why not, so many people are full of themselves, I appreciate the hard and innovative work. While it it is a concept, I am sure it will see some changes.

Tracy Spencer

i couldnt even afford the fuel... :p

Mack McDowell

The wave piercing trimaran known as the Ady Gil was a wave piercing trimaran, technically this is a stabilized trimaran monohull trimaran. A good example of which is now a vessel known as the Brigitte Bardot formerly known as the Gojira currently in service of Sea Shepherd and the Brigitte Bardot foundation. One-off, maybe, certainly not a one-of. this may be the future of private yachts, but they will have to prove it a much smoother ride than the Ady Gil.


Yachts have always been symbols of extravagance.

This is just an overgrown pontoon boat.

The Ady Gil as a wavepiercing vessel was somewhat semi-submersible.

The resemblance is superficial at best.


it looks big, but its not

Waiel Jibrail

This, this is a ship! After this design, space travel for yachts. The exterior is that appealing to me.



The main hull is extremely narrow so as to reduce drag at the cost of stability and comfort were it to be a mono hull vessel. To offset this inherent instability those \"wings\" far from being a waste of space are there to support the outriggers which in turn stop the vessel from capsizing.

A fine mix of efficiency and stability.


Looking at the numbers they wennt overboard trying to get the longest yacht for the money. Because the hulls are so long they have a lot of surface area which is why it needs so much power.

It would be easy to build a 60\' tri that does the same thing better, far lower cost and still look good.

interesting is Shuttleworth founded Mother Earth News.


For maximum fuel-efficiency they could have integrated the new systems where you lose two knots of speed say from fifteen to 12-13 knots by dropping turbines in the water that are tuned perfectly-and can then travel for 6 hours basically for free at 5-6 knots or have all that electricity for onboard needs. Like adding insulation to your house costs upfront but the payback is long term and awesome. Also if the outriggers were somehow retractable you could then get in places for berths etc. easier-less expensive too!

Post a Comment

Login with your Gizmag account:

Related Articles
Looking for something? Search our articles