Joint Multi Mission Submarine

[Ospite intruder]

La US Navy intende dotarsi di un mezzo di trasporto per gli incursori SEAL e che possa essere trasportato nelle selle montate sul dorso degli sSN. I primi tre battelli dovrebbero entrare in servizio nel 2016.

 

Questo il breve testo riportato su janes.com

 

Anxious to put the unhappy experience of the Advanced SEAL Delivery System (ASDS) programme behind it, the US Navy has disclosed plans to procure a follow-on submarine-launched combat submersible to support the clandestine insertion and extraction of US Special Operation Forces (SOF) in non-permissive areas.

 

In a request for information (RfI) released on 30 December, Naval Sea Systems Command (NAVSEA) advised the industry of its intention to pursue the accelerated acquisition of a new class of host-submarine-launched Joint Multi-Mission Submarine (JMMS) to achieve an initial operating capability in Fiscal Year 2016. A class of up to three units is planned.

 

The ASDS programme was conceived in the early 1990s to provide SOF with a long duration, dry compartment submersible offering improved range, payload, on-station loiter time, endurance, habitability and communication/sensor capacity over legacy swimmer delivery vehicles. Westinghouse Electric Corporation's Oceanic Division was appointed as lead contractor in 1994; Northrop Grumman acquired this business in 1996 and subsequently assumed responsibility for the ASDS contract.

[Ospite iscandar]

La pagina di Global Security

 

alcune immagini

 

 

 

 

[Ospite intruder]

Questo è l'ASDS, Advanced SEAL Delivery System, che è naufragato per problemi di costo. Il JMMS è nato per sostituirlo, non si sa con quali risultati. Di qui al 2016 vedremo.

[Rick86]

Può essere interessante sapere che gli americani dispongono di un Seawolf modificato (l'SSN-23 Jimmy Carter): allungato di 30m, contiene una sezione allagabile che può accogliere all'interno del sottomarino (e non all'esterno con tutti i problemi di rumore e decadimento delle prestazioni dell'SSN madre) un minisom come l'ASDS.

La comunicazione con l'esterno è assicurata da un portello apribile che mette in comunicazione l'Ocean Hull Interface con il mare.

 

Oltre a ciò al Jimmy Carter hanno aggiunto due piccole eliche di manovra a prua, tipo quelle della Cavour.

[Ospite intruder]

Interessante, non sapevo della cosa (se anche l'ho letta precedentemente mi dev'essere sfuggita... ahi, l'età e l'alzheimer che incalzano!).

[Rick86]

QUI c'è un bel confronto tra le caratteristiche tecniche dell'SSN-23 e quelle del Seawolf base.

 

Differentiating the Jimmy Carter from all other undersea vessels is its Multi-Mission Platform (MMP), which includes a 100-foot hull extension that enhances payload capability, enabling it to accommodate advanced technology required to develop and test an entirely new generation of weapons, sensors and undersea vehicles. Additionally, a dedicated and reconfigurable electronics suite using commercial off-the-shelf technology and open architecture will make it easy to accommodate future payloads and sensors.

 

The planned alterations include lengthening the hull behind the sail and inserting an Ocean Interface (OI) section that will support the Multi-Mission Project by opening larger payload apertures to the sea. The resulting modular architecture will allow the ship to be configured for specific missions using interchangeable payloads and tailored support services, yet it will preserve the submarine's core mission capabilities for normal tasking. The OI hull insert is unique, with a horizontal "hourglass" configuration that necks the pressure hull down to a "wasp waist," so that when the section is faired over, significant external volume will be available outside the pressure hull, but still within the skin of the ship. This will allow more flexibility in designing and adding systems and storage, while maintaining a smooth hydrodynamic hull shape with minimal impact on the ship's draft.

 

The OI facilitates more flexible payload interfaces with the water and imposes far fewer constraints on the shape or size of weapons, auxiliary vehicles, and sensors to be deployed from the submarine. The OI supports the launch and recovery of tethered and autonomous vehicles without incurring many of the difficulties of current designs using torpedo tubes. The external volume under the shroud could also contain the necessary support systems for such vehicles. This approach would allow the host submarine to control the vehicle from within the ship without consuming valuable internal space for large cable reels or other support equipment. The OI will also allow the ship to deploy and retrieve a new generation of weapons, countermeasures, and sensors, which can now be developed without the size limitations imposed by torpedo or vertical launch tubes. In addition, Jimmy Carter will be configured with an advanced communications mast to support the high-volume data requirements of network-centric warfare, as well as DSB-recommended auxiliary maneuvering devices for low speed operations in littoral regions.

 

Despite her modification to conduct classified RDT&E, Jimmy Carter will retain all her organic warfighting capability, as shown in the accompanying table. She will support the fleet commander as an attack submarine in conducting undersea warfare, surveillance and reconnaissance, covert special operations, mine warfare, and strike operations, just as her two sister ships do. She will also be available to the Navy to test future concepts for weapons, countermeasures, and non-traditional payloads - tasking that is currently divided among several submarines. In addition to these robust capabilities, Jimmy Carter will also be capable of supporting Special Operations Forces (SOF), with provision for operating the Dry Deck Shelter (DDS) and Advanced SEAL Delivery System (ASDS). Moreover, one of the ship's most important functions will be to support research and development for future Naval Special Warfare (NSW) undersea mobility requirements, tactics, techniques, and procedures. Jimmy Carter had already been programmed to support NSW, but the additional volume and length of the OI provides even greater potential to develop new roles for submarines in special operations. The OI will provide a hangar or garage capability for locking-in and locking-out future generations of SEAL delivery vehicles, and her reconfigurable cargo area can accommodate dry stowage and access for maintenance. Other internal volume will be available as command and control space for mission planning and monitoring, plus dedicated berthing space for up to fifty SOF Team members. The extra external volume created by the hourglass design allows for stowage of SOF supplies like Combat Raiding Craft, fuel, munitions or delivery vehicles.

 

Con più di 12.000 ton di dislocamento penso sia il più grosso, costoso ed avanzato SSN mai costruito, superiore per velocità, payload, profondità e probabilmente anche silenziosità rispetto ai Virginia

Modificato 26 Marzo 2009 da Rick86

[madmike]

L'informazione sul Jimmy carter e' pero' incorretta: il sottomarino dispone si di un compartimento, ricavato dall'allungamento dello scafo, 'umido', ed in grado di fare uscire incursori e i loro mezzi. Non puo' pero', anche per evidenti motivi di spazio, operare DALL'INTERNO lo ASDS, come peraltro risulta anche dall'allegato postato da Rick:

 

with provision for operating the Dry Deck Shelter (DDS) and Advanced SEAL Delivery System (ASDS).

 

ovvero, come altri SSN, puo' imbarcare, montato in coperta, sia il DDS che lo ASDS (l'ultimo dei quali ovviamente non più ).

[Rick86]

Chiedo venia, avevo sempre saputo il contrario. Fino a che dimensioni può arrivare il pay-load interno allora? Cioè cosa posso mettere dentro l'hangar del sottomarino?

[Marco93]

molto interessante...fantastico!

[Ospite intruder]

Chiedo venia, avevo sempre saputo il contrario. Fino a che dimensioni può arrivare il pay-load interno allora? Cioè cosa posso mettere dentro l'hangar del sottomarino?

 

 

 

 

http://www.globalsecurity.org/military/sys...ship/ssn-23.htm

 

It has a Reconfigurable Cargo Area, which allows for stowage of SOF supplies, and it features a Command Center Suite for mission planning. The Jimmy Carter can also berth up to 50 SOF personnel.

 

 

http://www.submarinehistory.com/JimmyCarter.html

 

The Ocean Interface will provide a hangar capability for locking-in and locking-out future generations of SEAL delivery vehicles, and her reconfigurable cargo area can accommodate dry stowage and access for maintenance. Other internal volume will be available as command and control space for mission planning and monitoring, plus dedicated berthing space for up to fifty SEAL Team members

Modificato 26 Marzo 2009 da intruder

[Rick86]

the Ocean Interface will provide a hangar capability for locking-in and locking-out future generations of SEAL delivery vehicles

 

appunto questo conferma quello che sapevo io. Anche perchè l'ASDS è 65 x 8,5 piedi, mentre l'Ocean Interface Hull arriva a 100 piedi di lunghezza.

 

Modificato 26 Marzo 2009 da Rick86

[madmike]

No, Rick non e' cosi': la sezione E' 100 PIEDI, l'interfaccia, come puoi vedere anche dal disegno, e' capace di ospitare solo mezzi molto piccoli. L'ASDS e' un sottomarino vero e proprio, non ci starebbe mai.

[VittorioVeneto]

Un pò OT comunque:

 

Advanced SEAL Delivery System (ASDS)

 

 

 

 

 

Mission

Provide clandestine undersea mobility for SOF personnel and their mission support equipment

 

Description

Manned, dry-combatant mini-submarine

Operates in a wide range of environmental extremes and threat environments

Provides increased range and payload capacity, robust communication, loiter capability, and diver protection from the elements

Ample, dry habitable environment for SOF personnel and equipment

Rapid lock-out/lock-in capability

Transportable by sea, air or land

 

Status

ASDS contract awarded in 1994 for design, construction, and testing of the lead ASDS vehicle, a Land Transport Vehicle, host submarine conversion, and options to construct up to five follow-on production units

First ASDS constructed and delivered: FY 2000

 

Contractor

Northrop Grumman Corporation; Annapolis, Maryland

 

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Membri dei SEAL in addestramento con SDV nel Mar dei Caraibi:

 

 

 

 

 

Altre foto:

 

 

 

betasom.it

Modificato 26 Marzo 2009 da VittorioVeneto

[Ospite intruder]

Più che OT è cancellato dai programmi USN.

[cama81]

il jimmy carter è stato progettato per azioni di spionaggio ai danni di cablature in fibra ottica (le uniche che sfuggano ai satelliti di echelon ) per questo ha uno scompartimento per posarsi sul fondo e permettere agli operatori di lavorare sui cavi .