Fast patroal boats

[Guttorm]

Great video of the new Skjold class FPB

Check it out

http://www.22mtb.com/Video/Maanedens/knmskjold.mpg

Oh, errr, WARNING, heehehe, the vidio is made by the producers of the ship, so it's sortof like a commercial. :D

[Uninen]

Thanks, try this also..

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Jurmo Class landing crafts at speed, shows other ships also, including Missile Boat (save as) (http://tietokannat.mil.fi/janina/videot/jurmo_vauhdissa.avi)

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Its mostly about landing craft, but you also see Helsinki Class FAC in it.. (that was the first "stealth ship / fac" in service on this planet, and not the Swedish boat which is usually claimed to been first..)

[unwanted]

"Its mostly about landing craft, but you also see Helsinki Class FAC in it.. (that was the first "stealth ship / fac" in service on this planet, and not the Swedish boat which is usually claimed to been first..)"

Do you have any info on that .. I did a quick search on google and I only come up with some data on it .. nothing about it being Stealth .. or even up to class with the Swedish Visby corvette ...

[Uninen]

Its made out of composites, all of the structure you can see, is made out of composites.. similar to the materials used in F-117 / B-2 and it has low radar signature because of the composites used.. :)

http://www.mil.fi/merivoimat/esikunta/toim_kalusto_1.dsp to "20.dsp" there you can see some of the equipment used by Finnish navy, but not much details of em.. :|

But anyhow, all FAC:s (Helsinki, Rauma, Hamina and Itä Tuuli class) have low radar signature, as they all have been constructed out of composite materials. :)

[Guttorm]

Well, its not only the material that reduces radar signature. The shape is also significant.

But the Visby class intrests me, what are the specs?

Speed, armament etc etc.

[JoZo]

Here are some pictures of the norwegian "skjold-class"

http://www.defense-update.com/images/skjold-iceberg.jpg
http://www.soldat-und-technik.de/images/0103/norwegen_03.gif
http://www.mil.no/multimedia/archive/00026/skjoldbak_26147a.jpg



Specifications:

Length 47,5 m
Beam 13.5 m
Draft 0.9m on cushion, 2.2m off cushion
Displacement 270 tons fully loaded
Speed: 60 knots (The worlds fastest FPB)
Range 800 nautical miles
Crew 15 - 18
CODOG Propulsion: 2x6,000 kW gas turbines and 2x350 kW diesel
Armament: 8xSSM Missiles
Air Defense: SAM
Guns: 57 / 76mm automatic gun
Command and control: SENIT 2000 system

[KalleBalleSvartSk@lle]

The Visby-class corvettes:
http://www.kockums.se/SurfaceVessels/visby.html

Overall length
73 m

Beam
10.4 m

Displacement
600 tonnes (fully equipped)

Draught
2.4 m

Crew
43

Hull material
Sandwich construction carbon fibre reinforced plastic (CFRP)

High-speed machinery
4 gas turbines, total rating 16 000 kW

Low-speed machinery
2 diesel engines, total rating 2600 kW

Propulsion
2 waterjet propulsors

Speed
>35 knots

[Marmot1]

Basic facts KNM Skjold
http://www.knmskjold.org/images/ses_prinsipp.jpg


http://www.knmskjold.org/thumbs/t_gaback.jpg
http://www.knmskjold.org/thumbs/t_gafront.jpg
http://www.knmskjold.org/thumbs/t_ga3d.jpg
http://www.knmskjold.org/thumbs/t_gaside.jpg


L o a: 46,9 m
Beam: 13,5 m
High: 15 m (On cushion)
Draft: 2,3 m (Off cushion)
Speed: In excess of 55 knots
Displacement: 260 tons

Main engines:
2 gas turbines Rolls Royce Allison 571 KF 6000 kW (2 x 8160 Hp)

Auxillary systems:
2 Auxillary engines: MTU 6R 183 TE52 275 kW
2 Lift fan engines: MTU 12V TE92 735 kW
2 Manoeuvering engines: MTU 6R TE 92 370 kW

Generator:
440V 60Hz 3 phase 4 polar 228 kW

Propulsion:
2 x 80 cm KaMeWa water jets

Main gun:
76mm Oto Melara Super Rapid

Missiles:
Kongsberg NSM - Kongsberg Nye SjømålsMissiler (=New anti shipping missiles) developed for Skjold-class MTB.

Weapon control:
Delivered by DCNi.

Bridge consoles/ navigation equipment:
DCNi with norwegian subcontractors has delivered a bridge which is based on a proven concept already in use on several fast ferries.


The brigde is equipped with all modern electronic navigational equipment.

A SES is in principle based on a catamaran hull where lift fans blow air into an air cushion between the hulls. Rubber finger type seals in the bow and a bag seal in the stern close the air-leakage. An air pressure equivalent to abt. 0.5m water column is maintained and controlled by a Ride Control System.



The RNoN has acquired a substantial experience with naval SES during the last 5 years. The unique features of the SES concept as verified by the Oksøy class SES MCMVs are

improved shock resistance due to low wetted surface
improved seakeeping
reduced magnetic signature elevated position of main magnetic components
improved manoeuvring capability due to twin hull and waterjets
large deck spaces
In addition the FPB will utilise the extreme low resistance offered by the SES. The wetted surface of the side hulls is significantly reduced compared to catamarans. The wave resistance caused by the air-cushion is heavily speed dependent and vanishes at high speed, resulting in low high speed resistance compared to any displacement or semi-displacement vessels.

An important advantage is the low draft of the SES when operating on-cushion. A draft of less than one meter offers significant advantages in shallow waters, i.e. reduced likelihood of grounding and less vulnerability due to less exposed area for impact of floating objects.

The twin hulls have important advantages regarding survivability and redundancy. All important systems are redundant, and the vessels can operate with one engine room set out of work.


Machine Control Room where all ship tecnical equipment can be controlled. All engines may also be controlled from the bridge.

A combination of global and local FEM calculations have been carried out extensively, considering the anisotropy of the sandwich structure where needed. The theoretical laminate properties are based on the Tsai-Wu failure criterion, which have been verified by extensive laminate testing performed by the yard. The hull materials are selected following detailed assessment of mechanical properties and producibility. Special attention to waterjet interface with adjacent structure and mast were paid. Stiffness requirements to secure sufficient stiffness to the structures which are supporting the gun and EO/K-band radar director required extensive analyses.

All structures are built with FRP sandwich using uni-axial glassfibre and carbon laminates with vinylester or polyester resin. PVC core material is used in main structural elements below main deck and PMI core material is used elsewhere and for the complete superstructure.

The advantages with such a sandwich structures are multiple:

high strength to weight ratio
excellent shock resistance
embedded stealth capability
structural design without secondary stiffeners
simplifies construction
simplifies outfitting
A large quantity of the internal structural elements, internal and external decks, beams and the complete superstructure with the carbon fibre mast were fabricated applying the closed SCRIMP process, which is a vacuum assisted resin injection method used in order to reduce the styrene emission, to reduce the structural weight and improve the laminate properties. Heated walking zones on the upper deck to avoid ice build up is installed.

The extensive use of carbon is used in structures with high stiffness requirements, as beams, the mast and the supporting structure for the gun and EO/radar director.


For the first time radar absorbing materials are included in the loadbearing structure (structural RAM) of a vessel over large areas. This contributes to significant weight reduction compared to the conventional method of cladding this material on the outside of the load bearing structure. The ship is designed with a low number of reflective panel orientations and none right angled corners. This is the reason for the faceted external shape of the vessel.

Much effort is applied to minimise secondary structure and outfitting penetrating the flush exterior of the vessel to minimise the contribution to the radar cross section. All exterior doors and hatches are made flush and have exactly the same radar reflecting/absorbing characteristics as the adjacent panels elimination the reduction of the signature properties. Necessary deck outfitting as mooring pullers are either covered with radar absorbing covers or made de-mountable (rails). Window screens are made radar reflective and are installed flush without any visible coaming.

The Skjold class is designed with low IR and optical signature. A painting system with high IR absorption properties and a colour pattern to reduce optical signature measured for typical Norwegian coastal waters contributes to a balanced low level of signatures.



http://www.knmskjold.org/images/Foto7.jpg

[Adri]

I love the SKJOLD class MTB woot woot woot

[FPB_Squad]

Any one got some old pics of the former danish FPB´s? Wilm. Cl. ?

Was on an exercise with KNM Skjold when she was brand new, no guns, no nothing... Damn fine ship she is, and fast as h***.