Motion compensating ship personnel transfer gangway - GIF

[Jon]

I wonder if it's a response to the "catamarans are faster than monohulls" argument.

[Frank S]

There are many different classes of yachts used in racing Not always designed for the fastest point a to point b race. There are regattas in which only the very high end lux yachts enter, aimed at the billionaire boys/ girls clubs. after all what is the purpose of owning a 200 million dollar yacht if the only thing you can do with it is to sail leisurely from port to port

[Ralphxyz]

Hope you don't have a seat on the couch along the sides, you'd lose your legs!!

Ralph

[Jon]

Circular Stewart platform. I like how a clock is in the background of this GIF.

[albertq]

Looks like the same movements available in a flight simulator.

[Frank S]

Yep the clock is running a little fast due to the accelerated gif speed LOL

[Loose Ctrl]

That too seems like a lot of stuff to fail in a boat. The last thing anyone wants is a system in a boat that fails and throws of the center of gravity and weight distribution. It could lead to a capsize or knockdown if weather and sea conditions aren't good.

[Frank S]

Loose crtl, you are absolutely correct even the simplest form of ballast weight transfer can go wrong at the most inopportune time. the transfer of fuel or water from side to side as ballast is about the simplest there is in larger vessels. Smaller pleasure or racing yachts the crew becomes the ballast. Try forcing yourself to hang over the rails in 20 ft seas on a 40 ft yacht while the captain desperately ties to maintain head way He can't even drop the mainsail because the the throat halyard and gaff are fouled If he could somehow manage to drop it to half mast then the lower portion could be lashed and the remaining would be about the size of a storm sail about the only thing you can hope for is that the peak halyard holds because once it goes the gaff will drop on 1 end and you loose all control.
All of the human ballast is fighting to hang on to scared to be sick. About this time the top sail shears away then suddenly the halyards are free and you manage to lower the main sail to quarter mast get everything lashed now it is just a matter of being able to hold steerage into the waves everything is peachy.
As human ballast you swear never to crew on one of these death traps again.

[owen moore]

Years ago, one of the model airplane magazines had a project similar to this that had servos that would tilt a glass plate in a similar fashion. The glass plate had a bullseye with concentric rings painted on it. The object was to place a marble on the bullseye and try to keep it there while operating a hand held transmitter. This was a training device for the early days of model helicopter flying. It looked very difficult.

[PJs]

That covered quite a number of degrees of movement in the first 40 seconds or so and appears that they changed cameras for the additional 5+ minutes and another rash of degrees movement. 6 degrees of freedom (6DOF) is quite a complex system.

Here is a doctoral thesis by two Swedish students...a bit long and necessarily math heavy, but the conclusion and their parameters and proofs are sound...I imagine they got their PhD's. Note: first part is in Swedish but the body of it is English.

Pretty cool Jon!