Seastates

Seastates (Full Version)

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kch -> Seastates (8/31/2017 2:03:41 PM)
hi.. Just a quick question on weather. Does the sea state affect the ship speed and sensor and weapon performance? I realise that this probably much more important before the missile age, but I would still expect smaller vessels to suffer significant speed and performance issues in high wind

USSInchon -> RE: Seastates (8/31/2017 3:15:28 PM)
I don't think it does, I have experimented with it and found that even if the sea state is exceeded nothing happens. The ship will maintain flank speed indefinitely without issue.

thewood1 -> RE: Seastates (8/31/2017 3:26:41 PM)
Page 107 in the manual and through out the addendum and FAQ are comments on weather effects, including stability for gunnery.

AlphaSierra -> RE: Seastates (8/31/2017 4:57:06 PM)
In real life it sure does, more sonar than Radar, wind plays havoc with larger ships. Sea states around 5 or 6 can slow smaller ships. I have seen 30ft waves over the deck and that's 80ft from the waterline! In the Simulator not as much of an effect as it could be. A smaller ship would delay leaving port in a 5 or 6 seastate for instance. Large ships would drive the tugs into the breakwater over 20 to 25 knots of wind (hard to keep them on course through narrow channels)

Rory Noonan -> RE: Seastates (8/31/2017 8:36:09 PM)
In game weather does affect sonar and radar, sonar is affected by sea state and I think rainfall. Radar is affected by rainfall but not sure about sea state. Sea state has a fairly marked effect on gunnery accuracy but doesn't seem to slow anyone down from my observations. As AlphaSierra says above, in peace time most ships would try to flee from sea state >5, even in war time probably not much is going to get done on anything FFG - CG sized above sea state 6, from personal experience nearly everyone will be too sick to function. Edit: Coincidentally the ship I'm on right now is fleeing a storm that will bring SS 5 & 6

OldSarge -> RE: Seastates (9/3/2017 1:27:50 AM)
quote: ORIGINAL: apache85 In game weather does affect sonar and radar, sonar is affected by sea state and I think rainfall. Radar is affected by rainfall but not sure about sea state. Sea state has a fairly marked effect on gunnery accuracy but doesn't seem to slow anyone down from my observations. As AlphaSierra says above, in peace time most ships would try to flee from sea state >5, even in war time probably not much is going to get done on anything FFG - CG sized above sea state 6, from personal experience nearly everyone will be too sick to function. Edit: Coincidentally the ship I'm on right now is fleeing a storm that will bring SS 5 & 6 Latouche-Treville in stormy seas You won't be landing a chopper on her pad.

Gunner98 -> RE: Seastates (9/3/2017 8:41:31 AM)
Not so sure about that. This Sea King is using the Beartrap haul down system. https://www.youtube.com/watch?v=5p1xx0ysfeM Scary stuff. B

Rory Noonan -> RE: Seastates (9/3/2017 8:14:32 PM)
Yep, we used RAST in the RAN and had the capability--although often not the will--to recover helos in very high sea states. From an operational perspective however it was very unlikely a helo would be launched in those conditions, I recall even with a fairly urgent medical emergency on board our CO wouldn't authorise a helo launch in SS 5, instead we made a 12 hour dash back to port.

kch -> RE: Seastates (9/4/2017 1:47:48 PM)
Since you guys seem to know what you are talking about, what sea state would the following be? https://www.youtube.com/watch?v=s1XaZ-EVGkg

Rory Noonan -> RE: Seastates (9/5/2017 12:36:56 AM)
Seastate looks like 5 or maybe 6, the main issue is that's quite a small ship and it is bobbing around like a cork. It seems like the ship was initially beam on to swell (hence the huge roll early in the video) and then made a course change into the swell/wind to complete the landing. To be clear though I am not a seamanship specialist, there would be other people about who know much more about this.

kch -> RE: Seastates (9/5/2017 9:20:49 AM)
hats off to the people involved in the video. Very calm

CV60 -> RE: Seastates (9/6/2017 2:26:08 AM)
quote: Since you guys seem to know what you are talking about, what sea state would the following be? https://www.youtube.com/watch?v=s1XaZ-EVGkg I believe the ship is a Knud Rasmussen class patrol vessel [ https://en.wikipedia.org/wiki/HDMS_Ejnar_Mikkelsen_(P571) ] and was apparently shot as part of a test to determine the landing limits of the Lynx helo [ http://www.businessinsider.com/lynx-helicopter-landing-in-rough-seas-2016-5 ]. I couldn't find a description of the sea state when this video was shot. My guess is that this is in sea state 7. The Knud Rasmussen is 72m length overall, with a draft of 4.95m (hence the rolling in the video). Taking a screenshot of the video from a nearly abeam position, I show the LOA as 560 pixels, which translates to 0.128 meters/pixel. See attached. The height of the main deck/forecastle over the waterline appear to be about 50 pixels, or 6.4 meters. In the next photo, the wave (peak to trough-see white arrow) appears to be 90 pixels tall, or approximately 11.5 meters (actually more, due to the peak being further away). However, this may have been an unusually large wave, as that would put this in the sea state 9 category. The foam from breaking waves is beginning to be blown in the direction of the wind, but it is less pronounced than at sea state 8. [image]local://upfiles/43164/6C4F3B43F5934082B0198E8F4BB8C8EB.jpg[/image]

AlphaSierra -> RE: Seastates (9/6/2017 3:13:59 AM)
3 or 4 Beaufort Sea States I'm not sure when it was "decided" or Why some descriptions go past 6

Rory Noonan -> RE: Seastates (9/6/2017 4:47:02 AM)
Perhaps I'm ignorant but on all the ships I've worked on the Beaufort scale has gone to 12? I actually just went to the bridge to check, and it does indeed go to 12. The document you link to is from a whale watching group and is prefaced with words to the effect of 'it's not worth whale watching above sea state 4' and then 'here's a description of sea state 0-6'. Maybe that's where the confusion comes from? The Beaufort scale is actually a scale of wind speed, it is often translated/approximated to a wave intensity scale of 0-9 because wind and waves are closely related in the open ocean. There are a few different scales going around for waves, but the thing they all have in common is a degree of subjectivity, as it is basically impossible to measure a wave at sea and different people will have different estimates. Like I said, I am not an expert on seamanship so I could be wrong, but this is the first I've ever heard of the Beaufort scale only going to 6. One thing is certain though, that little patrol boat is in rough seas.

CV60 -> RE: Seastates (9/6/2017 10:27:47 AM)
quote: 3 or 4 Beaufort Sea States I'm not sure when it was "decided" or Why some descriptions go past 6 < Message edited by AlphaSierra -- 9/6/2017 3:24:03 AM > As apache85 noted, the Beaufort scale goes to 12 ( https://en.wikipedia.org/wiki/Beaufort_scale ) .

AlphaSierra -> RE: Seastates (9/6/2017 11:21:33 AM)
The sea state used in the sim is accurate and adequate.

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