[YachtForums]

To kick this off, I submit Vaudrey Miller's 82' Wavepiercer.

Designed by: Craig Loomes Design Group Ltd.

Length overall: 25.0 m
Length on waterline: 22.46 m
Beam: 6.2 m
Draft: 1.55 m
Displacement (Light Ship) 50 tonnes
Displacement (Heavy Ship) 81 tonnes
Cruise Speed (mid load, 1950rpm) 20 knots
Sprint Speed (Light ship) 25 knots
Main engines 2 x 1300 horsepower diesel (MAN V12)
Electrical Generation 2 x 25 kW, 400V 3 phase AC
Fuel (integral) 2 x 10,000 litres

Forward quarter running shot...

[YachtForums]

One hull is good. Two hulls are better. Three hulls are... too much?

[alloyed2sea]

At least mine.
What a fantastic, far-out design.
Not for the faint-hearted.
But what do we know about it - more fuel efficient, seakindly, and smoother ride?

[alloyed2sea]

..., and raise you another hull!
Dont know who or why (more deck space?) - but she's 152 feet long.

[YachtForums]

I can't even begin to theorize how this hull would handle in various sea conditions, i.e., following quartering seas, etc. However I can tell you that several offshore race hulls were produced in this configuration that did not work well for the application.

I believe one was called the "Trident". Steve Stepp (Velocity fame) built two hulls like this. One was sold to Mike Novak, who successfully campaigned some cats in the 80's to a couple of World Championships. We've had a few drinks through the years and joked about this ridiculous hull he bought from Steve. Theoretically... it had some sound fundamentals. In reality... real world testing proved an extremely unpredictable hull that created a ride nearly as harsh as a cathedral hull.

At displacement hull speeds, this concept could prove favorable for adaptation to yachts. Inherent stability being the most valuable asset, while still offering the interior accomodations of a true monohull and the ride quality of a narrow hull form.

[alloyed2sea]

A derivative of INCAT's long-running series of fast ferries, she's the USAV Spearhead (second of three built for US Armed Forces together with Bollinger Shipyard in Lousiana) - hull#61!
All-aluminum - duh! -- she cruises above 50knots!
Interested, much more info here:
http://www.incat.com.au/defence_fs.html
Clearly, the technology is proven - if only in commercial & govt applications to date.

[AMG]

I am sure you have seen the Triton Trimaran as well, another version of big multihull boats, more like the 152´above...

[YachtForums]

I see your gigantic Trimaran. But...

TRI THIS FOR SIZE!

The “Benchijigua Express”

When Austal signed a contract to build a second high speed vehicle-passenger ferry for European ferry operator Fred. Olsen, S.A. in June 2003 it signaled the start of not just another ferry from the world’s leading builder of high speed ships, but the creation of a new hullform that will revolutionise fast sea transportation by providing a significant improvement in seakeeping performance and passenger comfort over existing fast ferries.

The 126.7 metre cargo-vehicle-passenger ferry “Benchijigua Express” is larger than any existing diesel-powered fast ferry – catamaran or monohull – and is the world’s largest all-aluminium ship. Ordered in June 2003 the ferry will sail at loaded speeds in excess of 40 knots, providing capacity for 1350 passengers, over 350 cars or 450 truck lane metres and 123 cars.

Fred. Olsen, S.A. pioneered the use of large high-speed ferries in the Canary Islands and carries almost three million passengers, half a million cars and a quarter of a million cargo vehicles per year. It has been operating large fast catamarans since 1999, and while happy with the results, the company has identified some limitations in terms of capacity and especially passenger comfort when operating in rough seas.

This led to the conclusion that further research was needed in order to develop a new concept for high-speed vessels combining the good comfort provided by the soft movement of monohulls, with the low resistance and very good stability and carrying capacity of catamarans.

With these objectives in mind, Fred. Olsen, S.A. and Austal cooperated on an extensive programme of research, tank testing and other analysis to firstly develop a new design and then ensure it would meet Fred. Olsen, S.A.’s requirements in an efficient and cost-effective manner. The result is a slender stabilised monohull, more commonly referred to as a trimaran.

The final report showed the trimaran would offer a 26% improvement in operability over compared hull forms. Encouraged by these early predictions there was a program of further design development including additional tank testing, the construction of an 11 metre manned technology demonstrator modeling the vessel’s structure in detail using sophisticated finite-element techniques.

At the height of construction approximately 430 people were employed on the trimaran with construction taking 12 months plus two months for commissioning and sea trials.

A major milestone in the construction of this remarkable ship was achieved in mid-July 2004 when the bow section, itself measuring some 32 metres in length, 15 metres high and weighing 120 tonnes, was moved out of its building hall and united with the main structure. This revealed the true size and scale of the ferry to the outside world for the first time.

Following its launch on 25 September final onboard fitout was completed before sea trials during November and departure for the Canary Islands on a delivery voyage covering approximately 9,500 nautical miles.

The completion of “Benchijigua Express” clearly demonstrates Austal’s ability to design and construct high-speed ships of the size required for current and future defence projects. A team led by General Dynamics and including Austal is offering the trimaran hullform for the US Navy’s Littoral Combat Ship project.

[alloyed2sea]

Originally Posted by YachtForums

I

This led to the conclusion that further research was needed ...
With these objectives in mind, ... The result is a slender stabilised monohull, more commonly referred to as a trimaran.
.

Hmmm,...., I wonder if this boat was somehow related to this program.
I am actually still interested in buying this one as a "commuter boat" if and when I get that job in Virginia Beach. (I simply refuse to drive over that bridge ever day).
Purpose built, she set new standards for transporting four persons across rough water at high speed while minimizing slamming loads. The hull is built in a trimaran configuration. By limiting the beam of the center hull to 4.5 feet at the chine, using an extreme deadrise angle of 32 deg., slamming loads are reduced to 20% of those of a conventional monohull. The outer hulls serve to preserve stability.
This project was initiated by Anadrome Design, LLC, in Sept. of 1999. The principal designer is Dick Newick who is famed for his OSTAR (transatlantic single handed) winning sailing trimarins. The chief engineer was Keith Burgess of Maine Composites. Consultants who have contributed to this design are Adrian Thompson, the designer of the VSV wave piercing craft in Great Britain and Harry Schoell Marine Design of Pompano Beach, Florida.

In 2000, the full-scale prototype was built. A pretensioned monocoque aluminum alloy hull was computer-plasma cut in Canada by the jet boat racing champion, Rob Chrunyk, of Eagle Power Boats, and fabricated by Neil Malam of Aluminum Master in Clarkston, Washington. The construction combined state-of-the-art aluminum construction with composite panels. Since delivery of the boat for field testing in Maine in July of 2000, progressive experiments with differing engines, drives, and running surfaces have led to the boat presented at the Miami Boat Show of 2002.

The current vessel is powered by a fresh-water-cooled, fuel-injected gasoline V-8 built and rigged by Innovation Marine of Sarasota, Fla., closely resembling the specifications of the endurance motors they build for the Navy SEALS. The propulsion system is a series 1750 surface drive from PSI of Pompano Beach, Fla.
Cool, eh?

[alloyed2sea]

Originally Posted by YachtForums

I can't even begin to theorize how this hull would handle in various sea conditions, i.e., following quartering seas, etc. However I can tell you that several offshore race hulls were produced in this configuration that did not work well for the application.

I believe one was called the "Trident". Steve Stepp (Velocity fame) built two hulls like this. One was sold to Mike Novak, who successfully campaigned some cats in the 80's to a couple of World Championships. We've had a few drinks through the years and joked about this ridiculous hull he bought from Steve.

Theoretically... it had some sound fundamentals. In reality... real world testing proved an extremely unpredictable hull that created a ride nearly as harsh as a cathedral hull.

At displacement hull speeds, this concept could prove favorable for adaptation to yachts. Inherent stability being the most valuable asset, while still offering the interior accomodations of a true monohull.

Would be interesting if someone builds it.

Might that somebody be the US Navy?
See here:
http://www.gizmo.com.au/go/3568/

[EnigmaNZ]

Here are some more wave piecers from the Craig Loomes design stable.

http://www.cld.co.nz/welcome.htm

Most of the Loomes WP Cats are quite beamy, the narrow designs were for owners who wanted to access narrow berths and waterways. The WP Tris are another story.

[Arniev]

Looks like the U.S. Navy is serious about these new ship designs:

X-Craft / Littoral Surface Craft-Experimental (LSC(X)) Sea Fighter (FSF 1)







(Source: globalsecurity.org)

[EnigmaNZ]

Here's another smaller interesting design for a trimaran corvette, a smaller version of the LCS.

http://www.theaustralian.news.com.au...002142,00.html

http://www.austal.com/go/product-inf...-role-corvette

[EnigmaNZ]

Here's some pics of the the Austral and Incat multihull mini carriers.

[Garry Hartshorn]

Incat were really the first to deal with this hull form and spent a lot of time and effort in figuring it out. To date I have yet to se another designer really get a good grip on how and why they work. Don't want to sound negative but if you compare an incat wavepiercer against any other design of the same size Incat's will out perform.