Plans for: Displacement work cat 12-15 x 4.50 m

Rusty,

Will write Sean and here what he says.
Sure he is at Seawork this week and will come back busy!
Still, i'll be patient and mention your help!

Safe wind and nice link with the vid.

 

To be correct, the doctorate is from Odessa

Yes we are not the cheapest office, and the prices can not be compared with designers selling stock plans to amateur boat builders. Thus, 30k for custom design is quite reasonable, if You need it for production and need package for certification. For a commercial cat design, it might be even more as more paperwork required for classification. Our design sets are very complete and supported by calculations and experience of about 85 designs in service, by today.

Also note we have in-house team of 5 naval architects, 2 designers, 2 electrical/system engineers, support staff - more than most of one-man -show small boat designers (many without any degree). Anyway we are getting our customers and working on few interesting designs right now, including 16m patrol boat, 100' fuel efficient slender yacht, 10m riverine patrol/police craft, 48' cruising powercat and some others - full of work.

So, all together I think that was not expensive. Would like to know who can make custom design cheaper

 

Alberto,

It is inelegant to quote one self, yet in this occasion, allow me:
Your services are:
"Way beyond -my- budget"

Lets try again:
Any old off-the-shelf work-cat set of plans for what you would consider a bargain?
Who knows: my lucky day? Thanks.


Safe winds.
Sinclair

 

We make most of designs for production builders and those are not available for third parties. But modification of existing design is possible, can be discussed.

 

Alberto,

You do have my e-mail, since 08 or 09.

Send your questions and i will answer them with pleasure.

 

Please correct me if I'm wrong, but there's no accepted building codes like Lloyds etc for catamarans: in other words there is not such a thing as a qualified certified catamaran designer.

Amateur Cat designers are as qualified as commercial designers, there's no difference.

Of course it may be different in Russia......

If you want to use your boat to carry passengers, the MCA or equivalent body will come and test your design for stability and safety gear before they will issue you with a licence. They may also require a sea test.

 

rustybarge, from what I know, in Europe, and I think you're European, things are not as simple as you say. An amateur builder does not have things any easier, it is often more economical to buy the boat in a shipyard that make him self. Not only is it cheaper but bureaucratic hurdles for amateur difíles are overcome. That is why, among other things, in Europe there is virtually no amateur boatbuilding.
CE marking for recreational boats enforces compliance of so many rules tan even for professionals it is difficult to apply them properly.
If I'm wrong, other person more qualified than me on this forum can get me out of my mistake.

 

Not at all. There are accepted 'building codes' for catamarans - LR, DNVGL, etc. have the established Rules intended for cats. In Gerr's book in strength cats are not covered, yes There are no 'qualified catamaran designers', there are qualified naval architects with experience in catamaran design. One can rely on amateur designers with experience but no degree, but most of their designs would not pass commercial classification unless they hire engineering professionals for calculations, etc.

Passenger boat is not just 'tested', in most cases the drawings and calculations should be approved prior to build, especially if the boat built to class. Amateur designer will simply not be capable to perform all required calculations himself. No way 'amateur designer is as qualified as commercial designer'. If You say this, likely You have never seen a real design package... You like it or not, but this is the reality and this is why designers with professional training deliver higher value.

 

This is exactly correct, and for commercial/spacial craft it is even more complicated as more paperwork is required. Just imagine checking global strength of catamaran, say wet deck torsion strength - is there any amateur designer who does that? But this is required; not for pleasure craft currently, but for commercial craft it is.

 

For leisure craft in Europe at the moment if your boat is under 12 mtr in length and you want to classify it as RCD C: not more than 6 miles offshore, 2 mtr waves, force 6 conditions , you can self certify the boat if you are a manufacturer or a home builder without any inspection necessary. That's for private use.

You will find huge majority of the new boats for sale are classified as RCD C, even quite big ones, for that very reason!

http://www.britishmarine.co.uk/upload_pub/RCD_Boatbuilders_Guide_Apr06.pdf

Commercial coding requires inspection, stability tests, etc........

I don't believe there are build classifications for catamarans in the uk, as for example Lloyds classifications for monohulls that specify scantlings, plate thickness, loading etc etc....but I may well be wrong.

 

I am well aware of RCD, ISO and all related issues. We design a lot of boats for EU market. This is exactly what I said - for pleasure craft it is more easy, specially for smaller ones. The bigger and more complicated is the boat, the more engineering it requires leaving less field for amateur designers.

There is everything; just download LR SCC Rules and read it - Part 5 Chapter 2 gives the design loads for cats in composite, etc. Same other Rules, we use GL very often for composite cats.

 

Ok thanks.....

It will make sense for him to keep under the 12 mtr rule to avoid all the hassle!

 

Remember to get a quote for the bare hull moulding:
No bow rails
No cleats
No steering
No windscreen
No rubbing strake

then from that base price you can work out what extras you can afford.....

In my opinion: either make it all yourself, or get the big cheque book out!

 

12m 'easy limit' only works for pleasure cats... The topic starter was asking for workboat, right?

I would check with authorities in country of flag first. Then, decide on compliance standards and this will define the design budget.

In many jurisdictions, formal classification might not be required. There is IMO Small Commercial Vessels code for Carrebian countries covering vessels below 24m, for topic starter's location the Code might be applied.

Even if formal class is not required, I would recommend at least hull structure and stability designed to recognized Rules but without certification, this might increase the values and safety of craft, and also cover Builder's responsibilities.

 

..that makes very good sense, and anyway every boat hull manufactured in Europe will automatically meet those criteria.

The wiring and fit out will only then have to comply with local coding.