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buglerbilly
19-06-10, 04:35 AM
Seeing as we had that discussion about VLS replenishment at sea, here's a bright idea that potentially takes us a step further to heavy-load replenishment albeit NOT for VLS..........

Navy Large Vessel Interface Lift On Lift Off

Navy’s Large Vessel Interface Lift On/Lift Off (LVI Lo/Lo) crane loads and unloads safely in meter high waves…

The U.S Navy has developed a new crane rig that is able to transfer cargo at sea whilst compensating for surging waves, effectively eliminating the need for a sheltered harbor in emergency or combat situations.

Most ships need a protected port with calm waters to prevent cargo from swinging violently while being transferred. However, the Navy’s new Large Vessel Interface Lift On/Lift Off (LVI Lo/Lo) crane is fitted with an array of cameras and sensors, as well as motion-sensing algorithms that enable it to adjust automatically depending on the roll of the waves.


Navy Large Vessel Interface

In recent trials, the LVI Lo/Lo, developed by the by the Sea Warfare and Weapons Department of the Office of Naval Research along with Oceaneering International, successfully transferred 128 containers from one ship to another amid waves of up to 1 meter (3.28 feet).

Not only does the LVI Lo/Lo offer a safe method of cargo transfer without the need for a deep-water port, it does so with less man power. Standard cranes require a team of ten to move heavy cargo such as 20-foot containers and Humvees, the LVI Lo/Lo only requires three – one in the crane house and one on each ship.

Although the future development and use of the crane is still unclear, a demonstration version of it is installed on the SS Flickertail State, a crane ship based in Newport News, Va. And according to ONR, the crane is available to support U.S. humanitarian assistance and disaster-relief operations.

SteveJH
19-06-10, 07:55 AM
1 Metre swell? That doesnt sound all that much to me or am I missing something?

buglerbilly
19-06-10, 08:24 AM
Nope, 1 metre swell is SFA.............BUT the potential to go further has to be there..................

Weasel
20-06-10, 04:06 AM
Nope, 1 metre swell is SFA.............BUT the potential to go further has to be there..................

actually, 1 m is huge for a free swinging mass to load in a lolo cell. If (as the article suggests) the crane is capable of standard lolo operations then it might be capable of between 38 to 50 moves per hour in a 1 meter swell... that is a big advancement for discharge operations for south pacific ports.

cheers

w

buglerbilly
20-06-10, 05:41 AM
actually, 1 m is huge for a free swinging mass to load in a lolo cell. If (as the article suggests) the crane is capable of standard lolo operations then it might be capable of between 38 to 50 moves per hour in a 1 meter swell... that is a big advancement for discharge operations for south pacific ports.

cheers

w

Certainly it's far better than what is avaialble at the moment but it'd grab attention far more if they were talking about 2+ metre swells IF they are serious about replenishment-at-sea..............still this is a MASSIVE step forward!

SteveJH
20-06-10, 12:32 PM
What I meant was, I don't see a being able to use it in a 1 metre swell as being all that useful in the middle of the ocean. Wouldn't a swell larger then 1 metre be quite common?

buglerbilly
20-06-10, 03:58 PM
THE BEAUFORT SCALE

World Meteorological Organization sea state code

0 Calm (glassy) 0 m

1 Calm (rippled) 0 to 0.1 m

2 Smooth (wavelets) 0.1 to 0.5 m

3 Slight 0.5 to 1.25 m

4 Moderate 1.25 to 2.5 m

5 Rough 2.5 to 4 m

6 Very rough 4 to 6 m

7 High 6 to 9 m

8 Very high 9 to 14 m

9 Phenomenal Over 14 m

Sea State 3 equates to a 1 metre swell.............go above 2.5 metres and your in sea state 5 which is what you commonly find in the Southern Ocean and Northern Pacific amongst others. Mr W knows more about this sort of stuff..............

Riđđu
20-06-10, 05:52 PM
Wouldn't a swell larger then 1 metre be quite common?

Usually all you need is 6 hours of 8 m/s (15.5kn) wind in open ocean and you get over 1 meter swell (or is this some only in the Baltic sea thumb rule?). Archipelago is a different matter. I´m sure Weasel can explain more.