Shipbucket

From 2003, the "Sea Fury" Trimaran design:



• Proposed for FSC, LCS, USCG Deepwater.
• 45 knots maximum / 20 knots cruise.
• 2734 tonnes deep load
• Upperdeck mission bays either side of the centreline superstructure, with space for 12 40-foot containers. In this case, the forward pair are enclosed by removable panels, the second pair are shown and the last position is taken up by a USV. The source just shows the baseline weapons - 57mm, CIWS, Scout radar and a hangar for SH-60 - which should roughly equate to the combination shown here.

Reference: Short, B, "QinetiQ Trimaran Demonstrator - RV Triton", 2003

- RP1

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"Yes siree, the excitement never stops." Togusa, Ghost in the Shell

Wow, how nice is this design!

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There is no "I" in TEAM but there is a ME


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Current Worklist:
Redrawing my entire AU after a long absence from Shipbucket

So instead of props, its powered by a water jet?

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Everyone is a genius. But if you judge a fish on its ability to climb a tree, it will live its whole life believing that it is stupid. - Albert Einstein
The only stupid questions are the ones that go unasked.
Korean AU

@gordo8000: Yes, a 42MW (!) waterjet in the main hull and a 9MW waterjet in either side hull. Some kind of ducted propeller is shown under the side hulls, also.

RP1

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"Yes siree, the excitement never stops." Togusa, Ghost in the Shell

I've always heard that water jets were not good for anything larger than an FAC. Shows what I know.

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Everyone is a genius. But if you judge a fish on its ability to climb a tree, it will live its whole life believing that it is stupid. - Albert Einstein
The only stupid questions are the ones that go unasked.
Korean AU

It depends on the hull.

Can water jet be used:

On a classic single hull: Up to a certain size (FAC) (Not you have a type of advance water jets, water jets that are more like a High speed fan/propellers build in a tub in to the hull!)
Catamaran: A bit larger than FAC
Hull like the pic. above: The hull is small, that make it more easy to move forward and that means less pressure on water jets. So you can easy go up to the 200 meters mark

Regarding waterjets;

There isn't really a size limit on conventional axial or mixed flow waterjets per se, with regards to ship or jet size. It is more of a limit on the practicality of how much power one can put into a hull. Waterjets are more efficient at higher speeds - both due to the fundamentals of the jet unit itself and due to the elimination of shaft lines, brackets and rudders, but these high speeds are more usually reached by smaller craft.

Large waterjets of tens of megawatts are completely practical, but obviously have their own unique design impacts. Consider the data here: http://www.rolls-royce.com/marine/produ ... waterjets/

You should find that the data lends itself to some easy scaling based on input power - i.e. a large waterjet is in many ways just a bigger small waterjet. This is not as obvious as it seems, as some technologies do not scale well.

Large waterjets require a very heavy unit at the extreme stern of the vessel, which represents a challenge in terms of structural integration and maintenance of trim. For "boost" waterjets, which are only used for high speeds - as in this design or in the South African MEKO corvettes, the boost waterjet can greatly increase drag - due to the opening - when not in use. Doors can of course solve this, but add more complexity.

The Advanced Waterjet to which Heuhen refers is described here: http://media.bmt.org/bmt_media/resource ... orINEC.pdf

- RP1

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"Yes siree, the excitement never stops." Togusa, Ghost in the Shell

Thx for the PDF RP1 I did know about the system but haven't seen any information about it, and like that part about power requirement at High speed but not at low speed!

With regards to power, propulsion etc I would recommend the papers by David Bricknell from RR. He usually provides some useful data on typical power-displacement ratios, which Shipbucketeers could apply to see if their ships are "typical" or are moving outside the normal range - which does not mean they are impossible, of course.

The only paper I could find was here: http://www.ingenierosnavales.com/docure ... 073-79.pdf

Which is quite readable. He's also notable has being the only waterjet salesman who doesn't tell you to buy waterjets...

RP1

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"Yes siree, the excitement never stops." Togusa, Ghost in the Shell

Quite fascinating. Thanks for posting these.