Location: pittsburgh Building My Own Pontoons First time posting, but I have been viewing for some time.
I would put limber holes along the bottom pontoon partions at center & each side of all mid-ship panels.
It would make it easier to read your post, I didn't because it is too hard to read, if you used paragraphs. Location: pittsburgh Thanks For The Feedback Alan and Tim, thanks for the input.
I am very sorry for the rambiling posting, but I found myself caught up describing details. I could engage you in pointless vollys of postings that will show you how silly you really are, but I do not entertain myself with such childish pleasures. Location: Australia Thanks Jimith, it would be a waste of time indeed as I am sillier beyond your wildest dreams. Then again, if you don't fill with foam, water pressure at speed or in a turn may collapse the pontoon walls in. I've not seen or heard of this being done before, but I've never seen this aircraft like pontoon construction either. Location: pittsburgh Take a piece of 1?x12? sheeting and cut it so it will cover 2 bulkheads. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals.
I would probably get a better boat with plans from a professional, like one of the designers here, or at least asked for help a few times along the way, but for me a part of the fun was making it my own way.
I have enjoyed reading many of the posts here for some time, and now I want to give you a look at my boat. Rather then writing this post as a reply to every job request that is listed in this forum, I will post my request here for you to reply to me. The idea is to have the boat build near to where I live (Norway) as this will be my arena for the first few coming years. What material are you building from mate, what design, this will determine to a great extent the person that you require.
Location: Norway Full foam composite of hull deck ,bulkheads and furniture, vacuum bagged method using vinyl ester resins.
Originally Posted by PolarWind Full foam composite of hull deck ,bulkheads and furniture, vacuum bagged method using vinyl ester resins. I do have a number of Catamaran Designs ; I was researching many years on catamaran design.
China and providing Yacht Design Yacht Engineering Management service to European Companies in China Yacht Industry. I have not a catamaran package designs to show, but I sure can design YOUR OWN CAT custome (interior and exterior design) for your only working for a one off design! I'm working in a 30mt Power Catamaran concept together with a company and I will be pleased if you visit my website to know my nautic design. We have complete set of plans for the 60' cat referenced by topic starter, done to CE certification. I did perform substantial research on Catamarans Design and Catamaran Composite Construction Technologies for many years. I have a considerable database of Composite Materials; Equipments and Suppliers for the cost efficient sourcing of all the necessary for the Catamaran project Oops, these are famous Prout cats, I have one here for refit now.
I just performed the other day a survey in Kuweit City for a large South Europe built Composite Motor Yacht wich has been recently been payed for couple of millions.
Furthermore the motor yacht was lifted from the water and we did perform an inspection of its hull . In my opinion a vacuum infusion of polyester with a sandwich core should NOT be performed.
I have never seen in the Prout factory in China such practices and such bad engineering. Originally Posted by an2reir As I said I am no pal of Jack but I do respect his and his company work OK, maybe the works they did in Thailand and in China were different?

I think it is an issue of being fair to Prout Catamarans team's work whether or not did I get payed.
I am no buddy to Jack but these horrible materials I did have seen and documented employed in Eu made Mega yacht were not at all the materials employed in Prout catamarans by Dr Jack . Here a couple images of the Prout in China Catamarans they are made in epoxy vacuum infusion composite. I would like to remember that Design always comes before of the engineering and the rest that you talk about.
This is a kind of rule, you should know it; the reality that moves ahead the industrial production. Secondly, engineer does not 'follow the designer lines', he makes the 'pictures' work, of course if it is possible.
Location: Bournemouth Dorset UK Naval Engineers may be creative but they are not industrial designers. Originally Posted by an2reir Naval Engineers may be creative but they are not industrial designers. But true, most of today's boats are drawn by stylists with only marketing in mind, and due to over exaggerated role of those self-promoted stylists.
A good engineer will be able, where possible, to make real one thought, that creative thought.
In my experience very top Boat Manufacturing companies like say Brunswick or Bombardier are employing both Industrial Designers and Naval Engineers. And then there are exceptional architects like Zaha Hadid with her gamechanger yacht designs. Location: Italy (Garda Lake) and Croatia (Istria) I've taken your photo and have distorted it a bit, to eliminate the perspective and so obtain a horizontal keel and sheer lines. I have been wanting to build a small pontoon boat that will fit into the back of my Ford Explorer. Measure in an inch (left and right) on each side and make a 90 degree bend the length of the side. That in conjunction with a drain plug at the aft end of each pontoon will allow any water out.
From about ?? down, from the top of the angle on the side, drill and install screws threw the angle, aluminum, and into the sheeting to hold everything together. The how and why is off topic here, but I have come as far a looking at several designs and study plans. I have an interesting offer for you, which can significantly shorten the construction of your catamaran.
The cats they built in Thailand were drawn by furniture designers from China and there were no structural drawings. Concept design answers the questions 'how the thing looks?' 'how it works, is it feasible?' 'what is the idea of cost to build it?'. The Naval Architect is architect, that means he is producing creative design supported by sound engineering principles.
Often people with engineering degree are treated as 'he has degree in engineering thus he is an engineer and so thinking in the box and so he can not design!'.
It can be one person or a team, but both talents have to participate in project from early stages.
Sorry if your boat now looks like it has had a frontal crash against a concrete wall , but I wanted to see the line of sight of the helmsman, so the actual geometrical proportions of the ship are not so important.
Used to guide the Ohiopyle section and other area whitewater, so I should be able to keep everything dry on the gentle waters of the bottom. I was hoping for a better draft, but I checked the numbers first and just needed to be sure. The basic hull came together in a couple of days, not so with the rest…Working from plans would be faster, I had to measure everything from the boat. Cost less, less to throw away if it doesn't work and easier to get in and out of the water if it does. I started working on my budgets and realized I will be needing help through out the entire process.

If you feel this is a project you can work on then I welcome you and am looking forward to your comments and questions. They were modifying the molds by extensions and inserting wedges without any analysis of hydrostatics. Usually they are, and even more due to their experiences and deep knowledge of engineering principles. Thus, the naval architects create the layout and concept of craft, and only THEN the designer pulls the nice shapes and fashion pieces over it. But unfortunately there are some boats around that do not perform - following approach You just described.
Those having no any degree at all are 'I am not an engineer, so I am a designer and only I have a right to be creative! Doing right concept is naval architect's work from the beginning, to ensure efficient and safe parameters and layout of craft.
You can use the foam that you mix to fill the chambers, but you better know what you are doing, and it is expensive. It looks more balanced and allows you to get out of trouble as fast as you got into it (almost). The deck will be removable so I can take it apart quickly and slide the pontoons into my Explorer, then the deck slides on top of the pontoons so I don?t have to use a trailer. I am thinking in terms of discussing the project from scratch, finding pitfalls, making cost analysis, hints and tricks on building, etc.
You, engineer, have to follow my lines!' This is how those people think; I meet such 'designers' very often and they likely to ask for help once their project have failed. Not just shocking appearance and false 'innovation' such as cabin roof all in glass (in tropics!) and tender stored under catamaran bridgedeck. I started with just some basic ideas of what I wanted, a few measurements, and figured out the rest as the project moved along.
Designer generating rendered pictures on his own is doing anything but not boat design: average 'designer' does not know what should be the length of engine room and how to properly shape the hull - how they can lead naval architects?? I have seen boats sitting deep stern down and without any visibility from steering and no service access to engine, with arch shaking like a hell and spray flying over the bow at SS2, only because they were started by 'designers'. You can also screw 1" aluminum angle under the deck and on top of the pontoon to keep the deck from moving. That is why I am filling the compartments between the bulkheads with the blue foam sheet insulation at Lowes.
Can he define the seakeeping parameters for given speed, to make sure the craft is not too small so passengers will not vomit all the time?
We had one idiot (customer's 'designer') who scaled down passenger seats by 0.85 to fit them in the shape he has drawn - excellent idea! My colleague naval architect well said: 'All designs started by designers end up with disasters' - this is true in most cases. It feels solid for it’s weight, but in a light chop the shallow V bottom, about 11 degrees (constant), will limit it a bit. Can he evaluate the mass of craft, to shape underwater volume of hull and this way define the headroom and space for tanks? The foam will not be exposed, and I just need to displace any water that is going to leak in. You could use ping pong balls, plastic bottles, anything to displace water then fill in the voids. Does he know requirements to visibility from steering (yep, he need to calculate running trim first - can he?)? My garage was a complete mess for a year (I did nothing during the winter) so that’s probably why I did not bring my camera out there.

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