Salut guru,
Postez aici o parte din raspunsul lui Michael Kasten (partea autorizata de el), arhitectul velierului Phinsi referitor la fezabilitatea proiectului tau, construirea in Romania a unui velier de 30m cu mina de lucru putin experimentata si folosind stejarului in locul esentelor Indoneziene. Iti doresc mult succes in ceea ce intreprinzi.
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Hello Ray,
Thank you for your inquiry.
I find your inquiry to be very inspiring...! Several preliminary comments and ideas are below regarding the possibility of building
a wooden vessel such as you describe.
GENERAL NOTES...
I assume you aim to accomplish the construction in Romania. The boats described below are indeed adaptable to construction using
other wood species, the construction is very straightforward, and the team of people that you describe certainly should be able to
do the work.
The methods used to build these boats are based on the Indonesian system, where the planks are "edge fastened" so that the planking
can be done first. This is a very practical approach, which is vastly simpler than the boat building methods used in the West (i.e.
frames first). It is also extremely strong because the entire structure relies on the frames to a lesser extent, since the planks
are all fastened to each other along their edges.
In short, yes this kind of boat building would be very adaptable to being accomplished by a gang of willing amateurs. In fact, that
is exactly the system used in Indonesia. There is one master builder, one skilled assistant, and the rest of the crew are for the
most part totally inexperienced. By this "apprentice" approach, they build extremely fine vessels indeed.
Here are a few thoughts about what might be possible...
30m SAILING PHINISI...
Yes, the 30m Sailing Phinisi can be built using European oak (quercus alba). There are also several very suitable species of wood
from Africa that may be readily available to you, and at a reasonable cost, several of which are actually superior to oak. One good
example is Iroko (chlorophora excelsa).
The choice of wood species will probably come down to the cost of the wood per cubic meter, and then the decision will have already
been made!
The structure of the 30m Sailing Phinisi has been calculated according to the Germanischer Lloyds rule for wooden ships, using
tropical hardwood having an average wood density of 58 lb per cubic foot (925 kg / cubic meter).
The basic criterion that is used by GL for the calculation of structure is the density of the wood. A wood that is less dense
simply requires that larger structural members be used. Therefore, in order to build the 30m Sailing Phinisi using oak will simply
be a matter of re-sizing some of the structural members.
Here are a few considerations regarding the building plans...
The wood species that you decide upon will probably involve a change to the Vessel Specification, as well as the structure
calculations, and this will also affect the weight calculations. If the wood species you decide to use does not exceed a weight of
925 kg / cu meter (58 lb per cubic foot), then it will require only minor re-work of those calculations, and we can include that
minor re-work in the cost of the stock building plans.
If the wood species used for the hull will exceed 950 kg / cu meter, then we will ideally make use of lighter weight species for the
deck and superstructure. If we can find a suitable combination that yields an overall average wood density no greater than 925 kg /
cu meter, then we can still include that minor re-work in the cost of the stock building plans.
If the wood species used will exceed an average of 925 kg / cu meter, then it may be desirable to increase the hull volume in order
to carry that added weight. Naturally, to do that will require a considerable amount of re-design work. Should that be the case, I
would provide a detailed estimate for the re-work on the basis of the wood species that is chosen...
We can address the wood species question separately as needed, and only if needed.
OTHER DESIGN OPTIONS...
A few possibly interesting ideas can be found at
www.kastenmarine.com/prototypes_sail.htm, in particular the 125' Blackbeard, the
100' Bermuda, or the 62' Privateer. Those are prototype designs for which we would have to develop the completed building plans on
a custom basis.
Of course this is more time consuming and involves a greater cost for that development work, but possibly it could be the right
choice, depending on the specific requirements that are decided upon.
With kind regards,
Michael Kasten
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President,
Kasten Marine Design, Inc.
www.kastenmarine.com
www.kastenyachtdesign.com