Late Steve Job's yacht launched

Modern style driven design recieves praising reviews when launched, then disappear from sight.

Unloved.

 

Thats because style isnt good enough. It can simply be dismissed like an expensive dress at a Monaco casino.

Practicality and style is needed.

At the gateway to the West at the top of Malacca straits I have seen super yachts with both. Not many mind you.

Steve jobs obviously had a design in mind and knew what he wanted. He was obviously not interested in the boring charter business where boats need to look like they are expected to.

 

One issue I have with the older Feadship types are the fashion plates connecting Bulwarks between decks. Overhanging decks can usually be made sufficiently strong without them. So that's one "traditional" element that I feel is better eliminated.

Another place I think most modern yachts remain stuck in the past is being divided into a bunch of stacked decks, with no verticallity to the interiors. I prefer a split level design, which on yachts that are large enough could have a central multi-story atrium like a cruise ship, preferably with vertically oriented windows.

 

Are you talking about these elements here:
?

 

Yes. We decided to eliminate them when I participated in the design of the Kadey-Krogen 39.
http://www.kadeykrogen.com/39/

Other models in that line still have them, but they don't serve much purpose.
The Krogen Express does not have them:
http://www.krogenexpress.com/gallery.php?act=view&pid=14

Except for the fashion plates I like tuna clippers (photo).

One problem the Krogen Express shares with some tuna clippers: visibility of nearby items from the pilot house is not good with such a high bow.

 

Those are not fashion plates but structural elements.
For small trawlers like those Krogens, with low length/beam ratio they might not serve too much because the deck is subject mainly to bending loads. It behaves mostly as a truss beam subject to bending load due to persons standing on top of it.
On a yacht or a ship with much higher slenderness ratio (like the Feadship in the picture) the torsional loads start to become important. They tend to twist and rack the superstructure when ship rolls due to wave action. That's where these vertical reinforcements come into play. They serve to create a closed torsion-resisting structure which is, as you probably know, much stronger than an open one. It is also stronger than another closed but narrower structure, like the one which would be formed by the cabin walls only.
Of course, you can substitute these bulwark pillars by other ones, placed inside or hidden in the cabin structure. But you will end up with a heavier superstructure, because a torsion-resisting structure efficiency increases as the distance between walls increases.

 

Where the large overhangs of aft decks are concerned I agree, but where the side decks are concerned I don't think the weight difference is as great as your post implies. In fact, the openings are usually large enough that you'd want to engineer the overhangs to be sufficiently supported by the superstructure sides anyway.

 

True, but you are still considering only bending moments applied on an overhang deck.

What I've been saying is that on a slender hull (which the Krogen trawler is not but the Feadship yacht in the picture is) you have to take into account the torsional stress too. That's where it is important to insert pillar-like structure (the "fashion plate" ) which connects the free ends of the upper decks to the bullwark of the main deck, to close the stress circuit and to create a more efficient anti-torsion structure.

I would love to hear what could Ad Hoc teach us about this stuff.

 

I grant it's an interesting point. I suspect diagonal structure in the hull & main deck would do more were this really an issue, but good point nonetheless.

 

If you want to land a helicopter on it you will need them.

If you can recognize a boat by looking at it the designers are stuck.

Feadship being one.

But if you were Mr Elimlio with your wife and 6 kids with mama you will want to choose a boat that looks like a boat for your 1 week charter.

I don't know of any of these super yachts that are not for charter. Every one of these super yachts that enter my Marina here I will google it --I have'nt found one yet that is'nt.

 

It's a new day, I've slept over it and realized that I might be wrong here about the torsional issue, which probably is not that high in ships of this size. Those vertical elements are simply pillars which help supporting the upper deck. The choice of placing them where they are is probably due to construction-related and weight aspects inherent to that particular hull structure.

Of course, the general discussion about torsion being most effectively countered by wide closed sections remains valid.

Cheers to all!

 

You needed 'me' to point that out? Your a designer and Im just a --a --a pleb.

I am now walking around in circles with my eyes wide open in utter shock.

 

That "fashion plate" also opposes the stairway to the upper deck , so it promotes a feeling of security for anyone using the steps at sea.

 

Whoooa --another amazing discovery--what an amazing night of information by the educated this is.

OK ... have you been e mailing each other,---Am I the subject of this joke.

 

That can be accomplished with round stanchions. Where I've been privy to the process the plates have been part of the preliminary design/styling drawings, and have remained where initially drawn unless someone advocated eliminating them. Practical reasons for eliminating them include that they make it difficult to walk a line from the bow to the stern of the vessel, ditto for fishing lines, ditto for boarding ladders or lines, ditto for maintaining visual contact in an emergency situation, and they block visibility from cabin house windows. In the case of the Kadey-Krogen 39 the galley has a single portlight. The person slaving in the galley could be looking out at blue ocean, or could be looking at a piece of fiberglass out that portlight.