Can someone tell me how they do this?

[MothBalls]

Do they have seatbelts in the bridge? If you were standing in the bridge, you're looking at moving up and down at least 10-15m (30-45 feet), it not more, in just a couple seconds. One would think you'd be pretty beat up by the end of the day.

What about all of the equipment everywhere on the ship? Most importantly, what if you had to take a dump? They have seatbelts in there?


http://www.youtube.com/watch?v=mPBaqh3dcVM
Rough seas, Iceland

[antikristuseke]

If i had to guess, mine would be they brace and bend their knees a bit absorb the bumps.

[Skybird]

You better don't need to visit the toilet in that kind of weather...!? And no tea for me, thanks.

[Schroeder]

Seat belts are such a great invention....I hope they have some...:o

[Letum]

That's a steady hand the camera man has.

[Oberon]

I feel sorry for the mechanic, the constant lifting of the screws must play havoc with the engines. :doh:

[Letum]

I feel sorry for the mechanic, the constant lifting of the screws must play havoc with the engines. :doh:


Anyone know why a ship I was on shook very violently every time the
screws came out of the water?

I know it's a bad thing to happen, but why would the whole boat shake or
vibrate so much?

[Oberon]

Anyone know why a ship I was on shook very violently every time the
screws came out of the water?

I know it's a bad thing to happen, but why would the whole boat shake or
vibrate so much?


Shaft vibration I think, IIRC when the screws come out of the water, the lack of resistance makes them rev up and the sudden increase of revolutions makes the shaft shake and can lead to shaft damage which is why usually as soon as it starts to happen the engineer has to cut power and let the screws spool down until they hit the water again.

[Schroeder]

Higher revs of the engine and the shafts?

@Oberon

If I had to build a ship I would put a RPM limiter in it so that the engines can't overrev any more.
I'm not sure whether ships really have something like that, but it sounds logical to me.

[Oberon]

Higher revs of the engine and the shafts?

@Oberon

If I had to build a ship I would put a RPM limiter in it so that the engines can't overrev any more.
I'm not sure whether ships really have something like that, but it sounds logical to me.

One would hope that modern ships have such a thing :yep:

[Ramius]

That's just a big swell thats all :arrgh!:

Try going through someting like that in a boat - then you know what its like to get thrown around :yeah:

[Oberon]

That's just a big swell thats all :arrgh!:

Try going through someting like that in a boat - then you know what its like to get thrown around :yeah:


The term peas in a drum come to mind :arrgh!:

[antikristuseke]

Higher revs of the engine and the shafts?

@Oberon

If I had to build a ship I would put a RPM limiter in it so that the engines can't overrev any more.
I'm not sure whether ships really have something like that, but it sounds logical to me.

Rev limiters are not completely foolproof. Allos the immediate reuction of resistance will cause problems.

[Dowly]

Higher revs of the engine and the shafts?

@Oberon

If I had to build a ship I would put a RPM limiter in it so that the engines can't overrev any more.
I'm not sure whether ships really have something like that, but it sounds logical to me.

I believe that an RPM limiter wouldnt work as it is more due to the sudden disappearance of the water resistance. Basically, the engine runs at the same RPM all the time, but when in water, the RPM cant grow as high as if out of water (because of the water resistance). :hmmm:

[AVGWarhawk]

I believe that an RPM limiter wouldnt work as it is more due to the sudden disappearance of the water resistance. Basically, the engine runs at the same RPM all the time, but when in water, the RPM cant grow as high as if out of water (because of the water resistance). :hmmm:


:yep:

I believe they still have to work the throttles when the stern breaches.

[ETR3(SS)]

I'm gonna say no to seat belts on this one. In the video you would think the boat is being tossed around quite a bit and the crew would be flying all over the boat, but you can anticipate the seas and adjust accordingly. I remember being submerged and (what felt like) being tossed around like that. Imagine taking a shower in something like this!:o

[SteamWake]

Anyone know why a ship I was on shook very violently every time the
screws came out of the water?

I know it's a bad thing to happen, but why would the whole boat shake or
vibrate so much?

A phenominom known as resonate frequency.

When the screws come out of the water that frequency is quite different.

http://en.wikipedia.org/wiki/Resonance

[CastleBravo]

That is one hell of a ride!! What is amazing is how close the vessel taking the video is to the other, and how close both ships are to those big rocks. It seems to me that would be dangerous as all get out!

[SteamWake]

That is one hell of a ride!! What is amazing is how close the vessel taking the video is to the other, and how close both ships are to those big rocks. It seems to me that would be dangerous as all get out!

Telecompression (objects in view may not be as close as they appear) :03:

I get the impression that this video was shot from land with a telephoto lens. Its the only explanation for the steadyness of the camera.

[CastleBravo]

Telecompression (objects in view may not be as close as they appear) :03:

I get the impression that this video was shot from land with a telephoto lens. Its the only explanation for the steadyness of the camera.

I'd agree with you except there are a few frames (32-38 sec.) where you may notice the vessel taking the video, pitching in the lower right portion of the screen.