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Modular OPVs
http://67.205.157.234/forums/viewtopic.php?f=13&t=158		 Page 1 of 2
Author:  RP1 [ August 27th, 2010, 1:20 pm ]
Post subject:  Modular OPVs
New forum, is it?

At long last, I get around to drawing something:

[ img ]

An OPV with a modular UxV payload. Three designs were developed as part of a study for NDP - a monohull, alternative broad-transom monohull and a trimaran. The latter is shown here in the "basic" version, using a mix of new equipment and systems recycled from existing ships. This design has the advantage of adaptability - it is possible to enlarge the superstructure to add a permanent hangar for EH101, additional weapons etc.

Reference:

Pawling, R & Andrews, D , "Three Innovative OPV Designs incorporating a Modular Payload for UXVs", RINA Warships 2010, London, June 2010
Author:  Colosseum [ August 27th, 2010, 2:01 pm ]
Post subject:  Re: Modular OPVs
Nice to see you posting again. :)
Author:  Canadai [ August 27th, 2010, 10:27 pm ]
Post subject:  Re: Modular OPVs
Nice ship, wonder how she would have handled actual combat.
Author:  klagldsf [ August 28th, 2010, 12:42 am ]
Post subject:  Re: Modular OPVs
Dare I say it, this is what LCS needs to be - a nice, large, stable vessel with relatively shallow draught that can act as a mothership to small craft and helicopters, and with the space to store them.
Author:  erik_t [ August 29th, 2010, 2:19 am ]
Post subject:  Re: Modular OPVs
Very cool. Kind of a crappy helo capability for what should be considered a natural small-combatant helo platform. I understand that telescopic hangars always look better on paper than in practice, although that's certainly not a primary source.

What's the top-down shape? I don't understand the forward half or so.

Screw could probably be nicer. Otherwise great work.
Author:  RP1 [ August 31st, 2010, 6:45 pm ]
Post subject:  Re: Modular OPVs
Colosseum: It's nice to be back! I have several conferences worth of designs to draw...

Canadai / Klagldsf / Erik-t:

This is the "low end" configuration, so the SeaRAM provides basic point defence against "onesy-twosy" type opportunistic missile attacks. similarly the provision of a flightdeck was more important than the hangar facility. If I have time to run the numbers I'll produce an up armed version with better aviation, SAM / SSM etc...

The hull shape forward is difficult to show in plan or side view - the sides of the box structure and side hulls actually have tumblehome, like the GD LCS, but the hull isn't curved in the same way.

I think there might be some minor changes needed to meet the latest Shipbucket standards - I grabbed the correct size prop from the equipment parts sheet.

And now the basic monohull design, the most conventional but in many ways the least satisfying, as the massive module bay really distorts the layout. Note the doors for a moonpool aft and an emergency thruster forward. Despite the small size, all these ships should be able to survive - and return to base - after considerable damage.

[ img ]

RP1
Author:  RP1 [ October 11th, 2010, 4:13 pm ]
Post subject:  Re: Modular OPVs
And now the final of the three designs, the Broad Transom Monohull. This was a very short ship, with a length to beam ratio of about 1:3.5. Note that this is not the "Short Fat Ship", but is closer to the "Ramform" - although it lacks the specific patented features of the latter.

The aim was to explore whether this shape of hull would lead to improved mission bay layouts. It did, but at the cost of greatly increased resistance.

[ img ]

RP1
Author:  klagldsf [ October 11th, 2010, 9:38 pm ]
Post subject:  Re: Modular OPVs
RP1 wrote:
[ img ]
No duh. It took them a whole study to figure that one out? :P
Author:  RP1 [ October 12th, 2010, 9:59 am ]
Post subject:  Re: Modular OPVs
Quote:
No duh. It took them a whole study to figure that one out?
Ahem

Reference:

Pawling, R & Andrews, D , "Three Innovative OPV Designs incorporating a Modular Payload for UXVs", RINA Warships 2010, London, June 2010

One day, someones going to figure out what RP1 means...

The question was - how much benefit to the layout and how much additional resistance. The answers were a lot and probably too much - although we are now curious as to whether this concept can be taken further - there are other potential advantages to the broad transom concept.

RP1
Author:  Portsmouth Bill [ October 12th, 2010, 11:25 am ]
Post subject:  Re: Modular OPVs
Nice to see you posting again :)

Innovative designs; and my only query so far is with the weapons placement on the Modular OPV: having the light aa and RAM all bunched up would make them vulnerable; though given the hull shape I'm not sure where you could move them.
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