Motion compensating ship personnel transfer gangway - GIF

**Frank S** · Aug 27, 2018, 09:41 AM

Now that is some good gyroscopic or more probably computer compensated stability

**Frank S** · Aug 27, 2018, 11:28 PM

IT may not be glued but if the shrouding on the gun is magnetic I'd say there is either a magnet inside the glass or glued to the bottom of the glass.
I can't tell if the camera is being moved or if the gun is being slewed aft as it appears in the video by the movement of the shadow There is defiantly at least 1 splice in the video.

**mklotz** · Aug 28, 2018, 08:01 AM

I have to agree that the cup is secured to the barrel in some manner. Perhaps they're not trying to show how the cup is balanced on the barrel but rather the fact that the water in the cup doesn't slosh about with the movement of the ship.

MD is dead on with his observation that the viewer should be able to see the ship's deck/gunwale moving about the barrel for it to be impressive. They should have chosen a time when the ship was corkscrewing or at least rolling or pitching.

I spent some time on the bridge of the USS Boston during a gunnery exercise and I can verify that watching those rotationally stable barrels while the ship rolls and pitches around them is a guaranteed method for giving yourself the worst case of seasickness imaginable.

**ranald** · Aug 28, 2018, 07:11 PM

LOL Marv. I could imagine that. The sea looks like Moreton bay on a relatively calm day:not even any whitecaps!
Cheers

**Jon** · Aug 28, 2018, 08:55 AM

2:14 source video:

**Frank S** · Aug 28, 2018, 10:05 AM

I guess the video removes all doubt about the glass being glued to the barrel

**Jon** · Aug 28, 2018, 10:39 AM

Maybe just a dab of glue that we can't see? Wouldn't the cup fall off from the wind or the water spray?

**Frank S** · Aug 28, 2018, 10:53 AM

You are right Jon a small dab of silicone would have held the cup in place and still have been easy to remove but even watching the last part of the video at .25 speed when he picked it up there was Zero resistance . At 1 time during the swing I thought I saw the glass wobble a bit.
Marv is right about being on board a vessel watching one of these hold nearly rock solid while everything else would be rocking rolling and pitching about is a recipe for creating chum at the railing.

**Moby Duck** · Aug 29, 2018, 03:08 AM

One of the ways to ease sea sickness is to stand on the upper deck and focus on the horizon. In the 1970’s there were experiments done where horizontal stabilised laser beams were projected onto all bulkheads in operations rooms and mess decks. I believe that the Royal Canadian Navy might have done some these experiments. The theory was that the eye would automatically pick up this artificial horizon, the brain would have something fixed to relate to, and sea sickness would be eliminated. I understand that it worked well, but I have never heard of it being fitted as standard equipment in ships anywhere. Looking at a horizontal, stabilised gun barrel would presumably have a similar effect. However if the barrel was elevated to say 40 degrees, that might make things even worse as Marv and Frank can attest to.
Of course the only real way to prevent sea sickness that is 100% reliable for everyone, is to stand under a tree.

**mklotz** · Aug 29, 2018, 08:03 AM

Originally Posted by Moby Duck

One of the ways to ease sea sickness is to stand on the upper deck and focus on the horizon. In the 1970’s there were experiments done where horizontal stabilised laser beams were projected onto all bulkheads in operations rooms and mess decks. I believe that the Royal Canadian Navy might have done some these experiments. The theory was that the eye would automatically pick up this artificial horizon, the brain would have something fixed to relate to, and sea sickness would be eliminated. I understand that it worked well, but I have never heard of it being fitted as standard equipment in ships anywhere. Looking at a horizontal, stabilised gun barrel would presumably have a similar effect. However if the barrel was elevated to say 40 degrees, that might make things even worse as Marv and Frank can attest to.
Of course the only real way to prevent sea sickness that is 100% reliable for everyone, is to stand under a tree.

Staring at the horizon works for me if I stand near the ship's rail and look out so I can't see any part of the ship rotating relative to the horizon.

It was almost impossible to watch the gun barrels from the bridge without having the ship's bow as background. This meant I saw the ship appear to rotate around the gun barrels. The effect is almost instantly sickening, at least it was for me.