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Aluminum Offshore Fishing Catamaran CNC Cost?
Discussion in ' Metal Boat Building ' started by jwells11 , Apr 1, 2020 .
jwells11 Junior Member
We all want a Freeman, But who can afford a 750k used Freeman(1000 engine hours) ****Yes Billy Wells(I think, maybe Kevin Beach) listed his Mexican Gulf 42 Freeman for 750ish..... Anyways I saw another Venice Captain who had an aluminum cat build that looked extremely close to a freeman and it supposedly cost around $300k. Did my research and if CNC it would be extremely easy to build for I have a way of getting CAD files for a similar boat. It will cost some dough to get the files thus my lack of info here and want to know if it wont be extremely overly priced. If you say 10-20k or 20-35k it is completely reasonable for the lack of info I have given. So here is what I want to CNC ------36x11 -----The bottoms and transom will be 5086 .250 ----- Sides, tunnel, and gunnel will be 5052 .210 (Will be eliminating spray chine to reduce welding and reduce CNC costs, so the sides will be one sheet) ------ Floor will be 5052 .190 -----(7)Baffels and (20)Stringers will be 5052 .19 ........Both keels will be 5086 .250 I know Im asking for lot but it seems like it wouldn't be that expensive. When 25 year old Contenders are going for 130k. Hull and deck only. Please best guesses and advice if possible ****I can weld, I also have a buddy who can as well and will trade me work for the CAD files to help with labor.
I need a guess of how much it will be for all of the CNC aluminum ------36x11 total dimensions -----The bottoms and transom will be 5086 .250 ----- Sides, tunnel, and gunnel will be 5052 .210 (Will be eliminating spray chine to reduce welding and reduce CNC costs, so the sides will be one sheet) ------ Floor will be 5052 .190 -----(7)Baffels and (20)Stringers will be 5052 .19 I can get the CAD at a price but want to see if its not going to be outlandish to CNC the metal
Barry Senior Member
35 FT Catamaran Workboat (616) | Aluminum Boat Plans & Designs by Specmar http://www.specmar.com/aluminum-boat-plans/aluminum-catamarans/35-ft-catamaran-workboat-616 Cutters of SPECMAR Hulls | Aluminum Boat Plans & Designs by Specmar http://www.specmar.com/resources/cutting-facitilites Attached is a link to Specmar and for a boat your size the cost for CAD files is $8,000 and below a list of cutters that Specmar lists as being companies who perhaps have worked with them in the past A note about aluminum, if you as an individual go into a aluminum company to purchase aluminum, you will pay much more than the companies that by hundreds of thousands of pounds per year. There are aluminum retailers, ie they buy from distributors and their prices can be are outrageous. Then there are the distributors who may quote a much better price IF the will sell into an area where they have dealers/retailers The point is that if you buy a set of plans, and $8k seems cheap to me, you should contact the companies listed to get a quote for supply and cutting. You may find that this is cheaper than you trying buy aluminum as an individual and paying someone to cut it. If you buy a Specmar plan, talk to them about this. I would use the search tab in the upper corner and search for Specmar. There was a response from either the company or someone who works there about 6 - 8 months ago who contributed some information to the forum and he might be a first best contact point. If I find the thread, I will edit into this comment later. "I have a buddy that can weld" Welding with mig takes some practice plus proper back cuts when joining sheet or even long continuous fillet welds. If you have a buddy "who can weld and has welded several boats" you would be ok. A guy who can just strike an arc, with little experience in boat building or fitting, would not be my first choice. Not to discourage you BUT it is quite different than sticking a few scraps of steel together. Triaxial stresses, stress concentrations, crater cracks and many other factors become much more significant in aluminum than say steel ( more significant) due to it's properties. The 5086 is a good alloy, not sure why you would change the sides to 5052. We used 5086 H32 on the sides and bottom, formed stringers from 5052H112. Avoided any 6000 series unless we could not form a particular piece There are some good books available, Aluminum Boat Building , Simms, The Complete Guide to Metal Boats, Roberts and there are others.
Mr Efficiency Senior Member
Huge project. I am confused by the pics, are you intending to build without the hard chine, but a rounded transition from the bottom to the sides ? That won't be developable in the forward parts. And apart from that, I would be very leery of a planing cat with rounded hulls, I have never seen one that didn't porpoise madly, the reason for that is that the lift at varying angles of attack does not change as much as it does a hard chine with chine flats. But I hate hobby horses !
Mr Efficiency said: ↑ Huge project. I am confused by the pics, are you intending to build without the hard chine, but a rounded transition from the bottom to the sides ? That won't be developable in the forward parts. And apart from that, I would be very leery of a planing cat with rounded hulls, I have never seen one that didn't porpoise madly, the reason for that is that the lift at varying angles of attack does not change as much as it does a hard chine with chine flats. But I hate hobby horses ! Click to expand...
Barry said: ↑ It looks like two different boats??? or maybe 3?? Click to expand...
Barry said: ↑ 35 FT Catamaran Workboat (616) | Aluminum Boat Plans & Designs by Specmar http://www.specmar.com/aluminum-boat-plans/aluminum-catamarans/35-ft-catamaran-workboat-616 Cutters of SPECMAR Hulls | Aluminum Boat Plans & Designs by Specmar http://www.specmar.com/resources/cutting-facitilites Attached is a link to Specmar and for a boat your size the cost for CAD files is $8,000 and below a list of cutters that Specmar lists as being companies who perhaps have worked with them in the past A note about aluminum, if you as an individual go into a aluminum company to purchase aluminum, you will pay much more than the companies that by hundreds of thousands of pounds per year. There are aluminum retailers, ie they buy from distributors and their prices can be are outrageous. Then there are the distributors who may quote a much better price IF the will sell into an area where they have dealers/retailers The point is that if you buy a set of plans, and $8k seems cheap to me, you should contact the companies listed to get a quote for supply and cutting. You may find that this is cheaper than you trying buy aluminum as an individual and paying someone to cut it. If you buy a Specmar plan, talk to them about this. I would use the search tab in the upper corner and search for Specmar. There was a response from either the company or someone who works there about 6 - 8 months ago who contributed some information to the forum and he might be a first best contact point. If I find the thread, I will edit into this comment later. "I have a buddy that can weld" Welding with mig takes some practice plus proper back cuts when joining sheet or even long continuous fillet welds. If you have a buddy "who can weld and has welded several boats" you would be ok. A guy who can just strike an arc, with little experience in boat building or fitting, would not be my first choice. Not to discourage you BUT it is quite different than sticking a few scraps of steel together. Triaxial stresses, stress concentrations, crater cracks and many other factors become much more significant in aluminum than say steel ( more significant) due to it's properties. The 5086 is a good alloy, not sure why you would change the sides to 5052. We used 5086 H32 on the sides and bottom, formed stringers from 5052H112. Avoided any 6000 series unless we could not form a particular piece There are some good books available, Aluminum Boat Building , Simms, The Complete Guide to Metal Boats, Roberts and there are others. Click to expand...
jwells11 said: ↑ Yes, the top boat is what it will look similar to. The rest are just structural design pics of what it will look like. It will have a hard chine, and I have rode on these boats and there is no way that it will porpose if removing the top chine(essentially a spray guard that is for more show than purpose). This company has built fin cats without them for years. Click to expand...
Mr Efficiency said: ↑ I was going on the framing pic, I surmise you are talking about the 'relief line' on the topsides, which has a visual affect of breaking up what might otherwise appear 'slab-sided'. If you are going to paint, you can achieve a similar effect fairly easily by using different colours. What power do you envisage, 4 x outboard ? Click to expand...
Added by @capt.blake Instagram post Empire Boatworks . . . #offshore #empireboatworks #fishing #boat #venicelouisiana - Picuki.com https://www.picuki.com/media/2218717511317528254 This will not be the same. Another difference I will be making is more of a square tunnel to reduce costs.
Not using stepped bottoms would simplify matters.
Mr Efficiency said: ↑ Not using stepped bottoms would simplify matters. Click to expand...
I will be putting a 4 jump seat pilot house on top with a small tower as well. This is a 52 and will be much much smaller But I like the lines on it
Attached Files:
1318b0_b4d24aa1b52a46b6a183d5b7afb3fefc_mv2.jpg.
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Probably look more like this but with more modern windows and a fish box and seat up front. This is a 34
pilothouse2.jpg
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Also hunting for small speed (power catamaran) I've also been searching for the same thing. Basically a 20'-25' Power Catamaran. I'm interested in the speed not the cruising though. But I'm start to seriously think about having a designer do up some plans for me so that I get exactly what I want.
There is seemingly not a lot of plywood plans available for power cats, and part of the reason for that might be that cats have a lot more individual panels, like more than twice as many as a monohull, so the demand may be limited.
When lightly loaded I expect it to hit semi-displacement speeds of 15+ mph on a cheap 6.5 HP industrial inboard gas engine (think Honda GX200). It is a 17 foot powered trimaran (sorry, not a catamaran) inspired by the traditional Philippine banca boat with further inspiration from the Atkin tunnel-stern Seabright skiffs.
I'm looking for plans for a [28-32Ft.] power catamaran to cruise the ICW and coastal waters of the east ern U.S. The boat should be easy to build and inexpense probably with small outboards. I plan on living aboard for 6-8 months at a time.
We did a lot of such cats, but they are all in composite, can be built in sandwich panels. And plans are not for 100$, of course. One on photo is 9m, designed as expedition cat for Far East Russia, the boat can be pulled up on shore by winch, quite robust and seaworty design with high payload capacity. Attached Files:
It is powered with a Yamaha 50 hp 2 stroke using a 11-3/4" x 10" pitch propeller which gave it 5000 rpm at WOT and a top speed of 28 kilometers per hour. It will probably go faster as the boat was heavily loaded with the sea trial crew of 8 adults". Here is another catamaran styled plywood boat you can check out.
I am looking for some information on the design and architecture of power catamarans. My plan is to design a catamaran between 7-12 meter length. I have read "Modern Ship Design" by Thomas C. Gilmer as well as VI&II of "Principles of Naval Architecture" by Rossel&Chapman. Both books have helpful information, but neither hits on catamarans.
And this si the same for either catamaran or monohull. If a monohull one hull of 20' if catamaran two hulls side by side also of 20'. I don't understand imperial units..so 20' = 6.10m For an efficient hull, you need a length-displacement ratio (LD) of at least 8.0. Any higher is much better.
Plans for sail, power, & rowboats - 8' to 62'. Especially for do-it-yourself builders. Build in wood, ply, stitch-&-glue, aluminum, steel, & fiberglass. [ view ] The official site of HH Payson, author of the Instant Boats series on inexpensive easily constructed boats for oar power and sail (the famous Phil Bolger designs.)
jwells11 Junior Member. I need a guess of how much it will be for all of the CNC aluminum. ------36x11 total dimensions. -----The bottoms and transom will be 5086 .250. ----- Sides, tunnel, and gunnel will be 5052 .210. (Will be eliminating spray chine to reduce welding and reduce CNC costs, so the sides will be one sheet) ------ Floor will be ...