Please select your home edition
Naiad/Oracle Supplier

Power Trimaran superyacht becomes a reality

by Orion Shuttleworth on 2 Jul 2011
Superyacht Adastra under construction in McConaghy yard Zhuhai China .
Motor yacht Adastra is a very interesting superyacht which is designed for ultra efficient long range cruising. The striking 42.5m Trimaran Adastra was designed by John Shuttleworth Yacht Designs and is currently being built in China by McConaghy International for a Hong Kong yacht owners Anto and Elaine Marden.

Yacht 'Adastra' is the result of more than five years of design and discussion with the owners, to build a yacht that meets the needs of a very experienced ocean voyaging couple and their family, and to provide the level of comfort and style that would be expected in a yacht of this class and size. No effort has been spared in the challenge to produce a beautiful yacht that will have low fuel consumption and yet provide excellent sea keeping qualities and luxurious accommodation.

Yacht 'Adastra' takes the power trimaran concept further than has ever been attempted before, previous vessels like 'Earthrace' and 'Cable and Wireless' were stripped out record breaking machines. The challenge of turning this concept into a viable luxury yacht has led us to further research and to develop new thinking on stability and comfort at sea for this type of craft.

Extensive tank testing and radio controlled model tests in waves have been carried out to analyze stability and performance. Outrigger height has been optimized for ease of motion at sea, and a new outrigger shape has been developed to increase stability in waves. We have undertaken a state of the art structural analysis of all the major components in the yacht in order to achieve the light weight required for very low fuel consumption. All this has resulted in the exceptional vessel that is nearing completion in China.

Adastra’s 16 metre beam creates a spacious saloon area on the main deck which offers superb views through a panoramic window and accommodates a lounge area, dining table, and navigation station. A forward facing door through the saloon window gives easy access to a large sunbed on the foredeck. The aft deck has a sofa and bar area to port and a dining area to starboard, further aft of this there is space for a 4.9 metre tender and directly below is a garage which can store a 3.1 metre tender. The garage door has been designed to fold out and create a large dive platform.

Extra space has been created below deck by slightly flaring the central hull just above the waterline. This area has been split into two sections with a full-width master cabin located aft with access from the deck saloon, and two further guest cabins, accommodation for the crew, and the galley located forward of the engine compartment. Adastra offers comfortable accommodation for nine guests and up to six crew members. The main helm station, which has seating for two, is positioned in a raised pilot house situated between the aft deck and the saloon area and forms part of the cross beam structure.

The Superstructure is carbon fibre with Nomex honeycomb core, the hull is Glass/Kevlar foam sandwich and the interior is light weight oak cabinetry using honeycomb panels. To help reduce weight, virtually every aspect of the boat is custom built. This includes carbon fibre hatches, portlights, ladders and even hinges, which are all built specifically for the vessel.

A SiMON_ integrated ships monitoring system monitors fuel, security, pump sensors, electrical, lights, etc. The vessel has a fully automated fuel management system which includes an Alfa Laval system for cleaning the fuel.

The anchoring system is unique with three anchors all driven by carbon fibre drum winches run by hydraulics. The primary anchor is a custom 130kg Bruce style anchor that deploys out of the starboard wing. The second anchor is 80kg and deploys out of the bow with a carbon fibre arm. The third anchor is 60kg which deploys out of the port wing and will be used as a stern anchor.

Specification of Motor yacht Adastra:
LOA – 42.5 m
Beam – 16 m
Hull Draft – 1.12 m (1.6m to tip of rudder)
Main engine – 1x Caterpillar C18 -1150 hp @ 2300 rpm
Outrigger engines – 2x Yanmar 110hp @ 3200 rpm
Generators – 2 x 36 kw custom in the outriggers linked to 110 Hp Yanmar engines, and 1x 26 kw Northern lights in Main engine room
Owner and Guests – 9
Crew – 5-6
Tenders – 4.9m stored on the aft deck and a 3.1m stored in the garage
Freshwater Capacity – 2x 800 gph fresh water makers – 2700 litres water
Displacement light – Fully equipped and full stores and crew, no fuel and no water – 49 tonnes
Displacement cruising max – (normal operational load) 15000 litres fuel – 64.8 tonnes
Displacement ocean passage max – (only for occasional long ocean passages) 32000 litres fuel – 77 tonnes
Speed max – 22.5 knots
Range at 17 knots – 4000 miles
Fuel consumption at 13 knots – 90 litres per hour.
Fuel consumption at 17 knots – 120 litres per hour
Exterior Styling – John Shuttleworth Yacht Designs Ltd.
Naval Architecture – John Shuttleworth Yacht Designs Ltd.
Structural Design – John Shuttleworth Yacht Designs Ltd. & Applied Structural Analysis Ltd.
Interior Design – Jepsen Designs, Hong Kong
Builder – McConaghy Boats, Zhuhai, China

Please contact John Shuttleworth Yacht Designs Ltd for more information:
Clay Lane
West Sussex RH20 4HL
Tel +44 (0)7880 796 862 or email John and Orion Shuttleworth at

[Sorry, this content could not be displayed]

Bakewell-White Yacht DesignBarz Optics - San Juan Worlds Best EyewearWildwind 2016 660x82

Related Articles

Gladwell's Line -The America's Cup settlement deal
The 'News' today that Emirates Team New Zealand has won their case before the Arbitration Panel is not news The 'News' today that Emirates Team New Zealand has won their case before the America's Cup Arbitration Panel is not new - Sail-World reported the same story in the first and second weeks of September. The Hearing on the amount of compensation to be paid is yet to be held. So far we have been unable to discover a date if indeed one has been set. Maybe next year?
Posted on 11 Oct
Debriefing the 2016 J/70 Worlds with Winning Skipper Joel Ronning
I talked with Joel Ronning after the 2016 Alcatel J/70 Worlds to learn about his team’s win at this high-level regatta. Since its inception in 2012, the J/70 has become the most popular One Design boat in decades, with 1,100+ boats sailing in myriad countries. Some 68 boats from 15 countries arrived on San Francisco Bay last week to determine bragging rights at the 2016 Alcatel J/70 Worlds. I caught up with Joel Ronning to learn more about the Catapult team’s road to becoming the 2016 J/70 World Champions.
Posted on 5 Oct
Rio 2016 - America's Cup champ says Paralympic racing is closest ever
Twice America’s Cup champion, Rick Dodson is extremely impressed with the standard of racing in the three man Sonar Twice America’s Cup champion, Rick Dodson is extremely impressed with the standard of racing in the three man Sonar keelboat class at the 2016 Paralympics in Rio de Janeiro. The regatta is being held in Guanabara Bay on three of the courses used for the Olympic Sailing Regatta in August.
Posted on 13 Sep
Debriefing the Rio 2016 Olympics with Team USA’s Helena Scutt
I talked with Team USA’s Helena Scutt to hear about her Olympic experience, and to learn more about her post-Rio plans. The 49erFX was introduced to Olympic circles when it replaced the Women’s Match Racing event following the 2012 Games. Not surprisingly, it drew high-performance sailors for the Rio 2016 Olympics, including Team USA’s Paris Henken and Helena Scutt. While Henken and Scutt were Olympic first-timers, they put on a strong show. I caught up with Scutt to hear more about her Olympic experience.
Posted on 8 Sep
A Q&A with Peter Bresnan ONE Palma’s founder and director
Sail-World interviewed ONE Palma’s founder Peter Bresnan to learn about the company’s partnership with McConaghy Boats For the past eight years, ONE Palma (formerly OneSails Spain) has been building a strong name, first as a sailmaker and later with refit work. Recently, ONE Palma and McConaghy Boats-legendary boatbuilders who have crafted some of the planet’s fastest sailboats-entered a business partnership. I caught up with Peter Bresnan, ONE Palma’s founder and director, to learn more about this new direction.
Posted on 2 Sep
America's Cup - Emirates Team NZ train late on the Waitemata Harbour
Emirates Team NZ were out for a training session that ran into the early Thursday evening. Emirates Team NZ were out for a training session that ran into the early Thursday evening. The team were sailing their recently launched AC45 Surrogate test boat which features an articulated rudder gantry - taking the AC45 close to the geometry of the AC50 to be used in the 2017 America's Cup.
Posted on 1 Sep
Dateline Rio - Sailing Olympics review - as good as it gets?
The Rio Sailing Olympics was widely judged to have been the best of recent times. The Rio Sailing Olympics was widely judged to have been the best of recent times. The weather was better than Weymouth and Qingdao, the courses more varied, but from a working media perspective, it was the people running the Rio regatta who really made the difference.
Posted on 26 Aug
Rio 2016 - Plain speaking by triple-medalist on Olympic sailing moves
Triple Olympic medalist, Santiago Lange has been on the sharp end of changes made to Olympic classes and formats Santiago Lange, a six-time Olympian and Bronze medallist in the 2004 and 2008 Olympics, won his third medal – Gold sailing in the Nacra 17 class. With that length of experience at an Olympic level, having sailed the Laser, Tornado and now Nacra 17 classes his comments on the future shape of the Olympic regatta was one of the highlights of the Medallists Media Conferences.
Posted on 25 Aug
An Q&A with Steve and Heidi Benjamin about the NYYC’s 2016 Queen’s Cup
Sail-World caught up with Steve and Heidi Benjamin to learn more about Heidi’s historic win in the NYYC’s Queen’s Cup. When it comes to U.S. Grand Prix sailing, it’s hard not to encounter the names of Steve and Heidi Benjamin. The two highly polished sailors have been successfully campaigning their series of yachts, named SPOOKIE, for years, starting first with a Carkeek 40 and progressing to their TP52. I caught up with Steve and Heidi to learn more about Heidi’s historic win in the NYYC’s Queen’s Cup
Posted on 19 Aug
Rio 2016 - Images of the penultimate race in the Finns - Scott wins
Sail-World's Richard Gladwell was on the water for the final race of the Qualifying Series of the Mens Finn Sail-World's Richard Gladwell was on the water for the final race of the Qualifying Series of the Mens Finn, in what potentially could have been Giles Scott's (GBR) Gold medal winning race. In the end, the current world champion won in style.
Posted on 15 Aug