Van der Valk 23M in build

[rafiki_]

That is a bit of an assumption. It surely depends upon many factors of thickness and lay up of grp vs the thickness of the alu hull and the fitting of the ips to the hull. This should be very stiff here otherwise the ips units will flex the hull when being driven wot. One could also assume that aluminium could tear around the IPS fitting and create just as big a whole if the engineers haven't got their sums right. I would argue that this is not any safer than GRP, perhaps the alu hull is easier to pierce in a grounding than grp for the same hull thickness?

You're right, of course it is an assumption, not doing the sums etc, but from my Materials lessons 100 or so years ago, I recall alu having more plastic deformation than composite. Again, I assume that VP or Merc spec the mounting of the pod for the boatbuilder, in th builders favored material.

 

[rbcoomer]

Hi Yoeri,

Great thread and very interesting watching it come together.

What happens with things like skin fittings (bilge, deck drainage, sink etc) do you use plastic or an alloy? I'm assuming bronze type fittings are a non-starter from a corrosion perspective... Are there other corrosion related decisions that are unique to building in aluminum?

Regards,

Robin

 

[Yoeri]

Dear all,

Henri, this is indeed a GT3 facelift which we used for the ADAD Rallye in 2006. Hell of car, which provided us with a super ride!!


Rafiki and Wakeup, yes correct guys. It totally depends on the thickness of the hull at that point and ofcource (in case of GFK) the age of the material. As the plasticizer is slowly going away from the material as it gets older.


rbcoomer, our skin fittings and deck drainage etc. are made out of RVS 316 stainless steel which are ungrounded using nylon rings.

Yoeri

 

[Yoeri]

Dear all,

At this moment construction of the hull is in one of the final stages. In abt. 1,5 weeks the hull will be finished.

Until last week, there was no definitive "yes" for building the superstructure, because we are implementing a complete new superstructure design for the new owner. The files will be routed so that they can start construction of the superstructure in abt. 2 weeks from now.

Yoeri

Engine foundation

 

[MapisM]

we are implementing a complete new superstructure design for the new owner.

This announcement is worthless without... drawings!

 

[Yoeri]

You are absolutely right MapisM!

It will look like the following, a much more soft chine superstructure. When the definate design of the superstructe is discussed you are the first to know of course!

 

[newWave]

I can't wait to see the result.

 

[Quest]

Looks fantastic.

 

[rafiki_]

Yes Yoeri, if this is representative, she looks gorgeous.

 

[Robg71]

Stunning....
After working in a couple of dutch shipyards, i can only say that the quality of work was top notch. And that was for knocking together oil field stuff.
I am sure the custom built cruisers like these are stunning in the flesh.....

 

[Yoeri]

Thanks for the replies!

Not all the final renders are ready, so we have to wait a few days for them.

Also in my opinion a very potential design what is more soft-chine that the existing designs.

Yoeri

 

[Yoeri]

Dear all,

After negotiations, the choices for superstructure are now final.
The main superstructure part is cutted now.

The guys started with the Portuguese bridge on the fore part of the superstructure.

As you can see, the owner afterwards has given order to remove the stainless steel accents (which we normally use as showpiece in the back part of the hull). These pieces are now filled and will be flat hull.

We hope to receive the superstructure part in abt. 2 weeks. We will start with the main super structure at the 24th of October.

 

[EME]

Some pictures are useless without words

Hi Yoeri

Thanks for the update

Can you give us some understanding of what is going on here and some of the 'customisation' ? --- I was doing OK until now.

All are of interest specially interested in the third picture -- I havent a clue on that one.

 

[Yoeri]

Dear EME,

Thanks for your reply!

Yes I fully understand and will explain some more about it:

The fist 3 pictures are of the front part of the superstructure.
I have uploaded a render which show's the place of this part.

Owners have the choice to make a u-shape seating area, a sun bed with lots of storage space underneath, or a Portuguese bridge as shown above with integrated sunlaying area and fenderstorages.


Customisation
The owner had a number of requests for the hull and superstructure:

- Specific size of the windows
- Round frontwindows
- Hartop of special design
- Special seating on the foredeck (with certain sizes as requirement)
- Round shape of the rear bulwarks
- Aft deck and main deck (inside) at the same level
- Specific size of the portholes inside the hull
- NO stainless steel striping at the rear part of the ship
- Drainage facilities
- Location of engine room ventilation

We have now implemented these requests in his new design and can continue the building process of the superstructure now.
The constructors and welders are not yet done with the hull, so later they can immediately start the superstructure.

Yoeri

 

[Jeepster]

@MapisM
I think I have expressed myself wrong in that sense.
I meant that in displacement "mode" (our semi-displacement and planing ship can also sail slowly ofcourse) there are more forces in the bow section. In planing "mode" there are more forces (forces of the machines not included) at the middle and rear part of the hull. Sorry for the confusion.


@deuc02
We use sacrifical anodes in all cases. Regardless of the age of the ship. But it depends whether you sail on salt or brackish water.

Salt water
Use zinc anodes (zinc anodes only work on salt water).

Brackish or fresh water
When you sail for 80% (or more) on brackish or fresh water you can better make use of aluminium anodes.

Yoeri

What about using Magnesium anodes for fresh water use? Or would that cause even more corrosion??

 

[rafiki_]

What about using Magnesium anodes for fresh water use? Or would that cause even more corrosion??

To my knowledge magnesium only for fresh water.

 

[Yoeri]

Dear Jeepster,

Rafiki is right.

A magnesium anode is only suitable for fresh water. But a short stay in salt water is not a problem.

Yoeri

 

[MapisM]

Owners have the choice to make a u-shape seating area, a sun bed with lots of storage space underneath, or a Portuguese bridge as shown above with integrated sunlaying area and fenderstorages.

By shown above, do you mean in that drawing?
I certainly wouldn't call that a P bridge...

 

[Yoeri]

Hi MapisM,

Officially, a Portuguese bridge consists of a walkway (including raised bulwark) behind the foredeck, in front and to the sides.
You're right that it might be too ambitious to be a real Portuguese bridge to mention.

Yoeri

 

[Yoeri]

Dear all,

Just a small update from the construction:

The cutted parts for the main superstructure will arrive at the shipyard next monay 06.00 am.
In the meantime the construction workers are finishing all the fortifications and reinforcements for the machineroom where 3 D13-800 machines will be settled.

As you can see the IPS foundations are made and welded.

Also the stern part will now take shape.

Yoeri