Mariner: Is motion worse in the front or the back?

[stiej]

We are in a D1 for next Sundays sailing and are in the front on deck 10. A pr of adjoinings have opened up on deck 6 and they are in the back. I thought I read forward motion was worse. Any thoughts? Thanks!

[cruisePRN]

The front of the ship will feel the most motion and the higher the deck the more the motion. Are you prone to sea sickness? I prefer mid ship where there is the least motion.

[stiej]

I would love midship, but until today, the forward D1s were the only adjoining we could get. Do you think the 6th deck back ones would be less motion?

[DonnaK]

We were in the front of deck 10 on Adventure (mariner's sister ship), and didn't feel motion any more than usual. It was a wonderful location, very convenient to the stairs up to the solarium. We had a aft cabin on deck 10 of Mariner, and we were the last balcony cabin on the side of deck 6 on Mariner, and again, didn't feel any more motion than usual. I think I prefered the deck six location because it was a quick flight down to the promenade (cafe) for coffee and snacks, and a quick ride up the aft bank of elevators to the Windjmmer and pool.

[NiniB]

I'm on the Grandeur... I got a case of the CRS syndrome... Why do they show you a cabin # on your itinerary when you have a guarantee cabin??? anyone?? :o

[cruiseguy1016]

The front of the ship has the same amount of motion as the back. It's impossible for it to be more or less. Think about it. If the front of the ship goes up, the back has to go down, right. There is no hinge in the middle to allow the front to move without the back moving also. The only spot to feel less motion is towards the center of the ship. Think of a see-saw. The ends move a lot up and down but the middle hardly moves at all.

[robtulipe]

I'm on the Grandeur... I got a case of the CRS syndrome... Why do they show you a cabin # on your itinerary when you have a guarantee cabin??? anyone?? :o

 

Are we talking about when you check out your reservation at My Cruises on RC's web site?

Maybe that is the cabin they have assigned you. Our last two cruise bookings were with guaranteed cabins and they were assigned to us within a day or two of us booking the cruise

[IronKey92]

We just returned from the Mariner on the 3/16 cruise and had a aft balcony - 6688. I am extremly sea sick typically, but got the patch before we left. Even with the rockin and rollin in the back due to the weather, I was fine. In the future, we will book mid - deck due to the walking. Have fun!

[robtulipe]

The front of the ship has the same amount of motion as the back. It's impossible for it to be more or less. Think about it. If the front of the ship goes up, the back has to go down, right. There is no hinge in the middle to allow the front to move without the back moving also. The only spot to feel less motion is towards the center of the ship. Think of a see-saw. The ends move a lot up and down but the middle hardly moves at all.

Actually the extreme back of the ship has less motion than the extreme front because of the propulsion from towards the back and that force tends to change some of the up and down motion to a forward one so it end up being less up and down. Also the bow having to break over the wave in rough seas when the ship is in a forward motion results in a greater up forces which causes the front to have greater movement than the back as the wave has lost some of it energy when it reaches that area due to the cutter action of the bow. Probably the most stable part of the ship or axis of motion would be at the waterline, around 2/3 towards the stern.

I know when we were on our Radiance Ultimate Alaska last Sept., cruising at full speed from Sitka for over a day in rough seas to catch the high tide at the Surge Narrows channel between Vancouver Is. and the BC mainland in order to be able to pass through that area safely, there was much less motion and it was much easier to walk in the dining room which was in this area (back third) than in our cabin (9501) which was high and at the extreme front of the ship or even in the hallway going to our cabin from the front elevator/staircase area.

[cruiseguy1016]

Actually the extreme back of the ship has less motion than the extreme front because of the propulsion from towards the back and that force tends to change some of the up and down motion to a forward one so it end up being less up and down. Also the bow having to break over the wave in rough seas when the ship is in a forward motion results in a greater up forces which causes the front to have greater movement than the back as the wave has lost some of it energy when it reaches that area due to the cutter action of the bow. Probably the most stable part of the ship or axis of motion would be at the waterline, around 2/3 towards the stern.

I know when we were on our Radiance Ultimate Alaska last Sept., cruising at full speed from Sitka for over a day in rough seas to catch the high tide at the Surge Narrows channel between Vancouver Is. and the BC mainland in order to be able to pass through that area safely, there was much less motion and it was much easier to walk in the dining room which was in this area (back third) than in our cabin (9501) which was high and at the extreme front of the ship or even in the hallway going to our cabin from the front elevator/staircase area.

 

So what you're saying is, when the ship is under propulsion only the back of the ship is being moved?:rolleyes: The front of the ship doesn't move with it? At what point does the back of the ship pass the front? :eek: And when that wave that pushes the bow up into the air, the back of the ship doesn't go down? Again, think of the see-saw. The ship is a solid unit. If the front goes up or down, then the back goes down or up the same amount with it. If the back of the ship is being propelled forward, the front of the ship is being propelled at the same rate. It's simple physics. There may be a perceived difference in movement but that's all it is, perceived. If your room was at the extreme front then yes, there would be more motion in your cabin than there would be in the part of the dining room that is closer to the center of the ship. Again, think see-saw.

[pmfan]

The motion is the same if you are in the very front vs. the very back. But I tend to feel it more in the front. Don't know why this is.

[Rancher Dave]

Depends on if you have a beer belly or not...:D

 

The Bow of the ship will get more agitation at wave interaction when the waves are being run over or are crashing the bow. If the waves are hitting the side of the ship bow or aft is the same.

 

The ship doesn't flex more or anything in the bow vs. the aft, but the noise combined with the jolts will certainly make the bow more miserable of a place to be in bad seas. Aft will ride over the waves with similar motion.

 

Best place to be in really bad seas is about where the hospital seems to be located...lower deck mid ship. Of course up on deck watching the horizion is also useful.

[springtxbill]

The ship does actually bend in rough seas, so the front does actually move more. Also the shudders and jolts from slamming into the waves are dampened by the hull as the force travels toward the stern.:)

[SDPadreFan]

In order to assume a perfect see-saw motion, you have to assume the location of the fulcrum is perfectly amidships. This is not the case because of the shape of the ship (pointy at the front, wide at the back. There is much more displaced water at the back of the ship because of this shape so the motion tends to be more gentle. The fulcrum point of most large modern ships tend to be between 60 & 75% from the bow. For a true see-saw action that point would have to be at 50%. If the ship had a flat bottom like some of the Navy's amphibious assault types (LHA, LSD, etc.) then you would have a more see-saw type movement.

[robtulipe]

So what you're saying is, when the ship is under propulsion only the back of the ship is being moved?:rolleyes: The front of the ship doesn't move with it? At what point does the back of the ship pass the front? :eek: And when that wave that pushes the bow up into the air, the back of the ship doesn't go down? Again, think of the see-saw. The ship is a solid unit. If the front goes up or down, then the back goes down or up the same amount with it. If the back of the ship is being propelled forward, the front of the ship is being propelled at the same rate. It's simple physics. There may be a perceived difference in movement but that's all it is, perceived. If your room was at the extreme front then yes, there would be more motion in your cabin than there would be in the part of the dining room that is closer to the center of the ship. Again, think see-saw.

The ship is not a see-saw or a simple level with a central pivot point. The propulsion pods or propellers at the extreme back of the ship provides a force that propels the ship horizontally and supports that part in an horizontal plane and that force tends to counter the up and down movement and has the greatest effect near its source.

Where as the front of the ship is like a unsupported end of a long stick that can flex and can be affected by the greater up and down forces of the wave there even if the ship is going in the same direction of the waves.

At what point does the back of the ship pass the front?

Well that happens when either end of the ship is unsupported enough in very rough sea that the flexing of the ship causes it to break in half and it sinks which has been reported as the cause of the lost of many ships. This also happens when the ship is flooding and goes down bow or stern first and the end of the ship (usually the stern since most ship accident damage happens to the bow) that raises above the water unsupported usually break away and tends to glide in the water a longer distance to the sea bottom than the already flooded end (usually the bow).

By the way the formal dining rooms on the Radiance and I believe all RC ships are in the rear quarter of the ship and our table was closes to the rear of the room.