Re: Eco 65 houseboat "Galadriel"
Hello Holger
I was already wondering.?
The better a gally looks the more work is in it.?
Before you put the roof on, finish the inside as far as you can. Special also all painting.?
Success
Bernd
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Re: Eco 65 houseboat "Galadriel"
Hi folks, hope you're all doing well out there! Just a short update from my side, I added some new photos to my album:? /g/K-designs-Multihull-Sailboats/album?id=131678During Winter season I was busy working inside, with a small heater running. I completed the cabin insulation and built two small side shelfs and the galley. Especially this one was a lot of small parts working and puzzling with gas, water and electricity piping and cabling, but in the end it has become a nice furniture and may give you an impression how all the other furniture parts will look like. It can completely be disassembled to get easy access to fresh water tank and boiler which got their place in the hull under it.? Almost all the big boats have left the shed now, so I can start working outside the cabin again. It's still a little bit cold for epoxy working here, but al least there were a couple of warmer days that allowed me to glue on the first roof panel. Looking forward to get the others on top. All the best to you! Best, Holger
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Re: Retransverse : [K-Designs-Multihull-Sailboats] Duo 900 Italy
Thanks David - as i said my recollection of my structural training is vague at best and i hoped someone like you would step in to give some real informed comment.
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Re: Wishbone Gaff With a Wood Mast
Henrique
A combination of a wing mast and the wishbone gaff is not a good combination.
When a wing mast he has to build in a way to rotate.?
Cheers
Bernd
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Re: KD 860 hull with vertical curvature?
The bow region of the build in India shows this rounded bow. But the plan shows a straight area with a bit of a tulip shape towards the bows.?
This very easy to do. The negative curve? is achived without overstressing the plywood
Bernd
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Hi Phil
Impressive work. You do a beautiful job.
But Phil, again, please watch the weight.
Cheers
Bernd?
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Re: Seattle Eco 55 power cat build
Hi James
Great to see an Eco 5.5 being built locally. I hope to see it afloat some day as well as seeing more photographs as you progress.
David Bainbridge Island
On Tuesday, April 27, 2021, 1:02:03 PM PDT, James Jones <jgjones252@...> wrote:
Hi all, Thought I should say hello, and share my project. I've been building an Eco 55 for a while now, and have a few photos to share. So far, all is progressing well, and it has been mostly fun. :) I'm planning on electric propulsion, with an Elco? EP-20, a 100 AH lithium battery bank (can expand to 200 AH if needed) and whatever amount of solar panels will fit. It's certainly an experiment, but after thinking it over, I believe it's worth a try. Anyway, as I continue to make it look more like a boat, I'll post again with new pics. Jim   
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Re: Seattle Eco 55 power cat build
Hi Phil
I have posted a link to a new 20 HP electric outboard. The company is in Spain and Singapore. I think no problem with cheap transport and customs
Bernd
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Re: Seattle Eco 55 power cat build
Hi Jim
Nice progress and looking good. As you can see you are not alone who will use the Elco 20HP electric outboard.?
Seattle is not known for his nice weather and much sunshine. I would use also a wind generator on? a folding mast.
Nice thing about wind generators they do not care about day and night as long as there is wind. You fold the mast down out of the way when you go sailing.
Cheers Bernd
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Re: Seattle Eco 55 power cat build
Hi Jim, great that you are building a Eco 5.5, me too. I am also making mine electric and was targeting an Elco 20HP. Do to the border being closed that choice is on hold as I would rather drive across the border and save a bunch in shipping cost. I have a 10 Kw battery bank for mine and my solar totals 1560 watts as I deviated from the original design. I do have pictures in the forum archive but it is probably time I added more.
Regards Phil
On Tuesday, April 27, 2021, 04:02:07 p.m. EDT, James Jones <jgjones252@...> wrote:
Hi all, Thought I should say hello, and share my project. I've been building an Eco 55 for a while now, and have a few photos to share. So far, all is progressing well, and it has been mostly fun. :) I'm planning on electric propulsion, with an Elco? EP-20, a 100 AH lithium battery bank (can expand to 200 AH if needed) and whatever amount of solar panels will fit. It's certainly an experiment, but after thinking it over, I believe it's worth a try. Anyway, as I continue to make it look more like a boat, I'll post again with new pics. Jim   
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Re: Retransverse : [K-Designs-Multihull-Sailboats] Duo 900 Italy
Hi Davide
Thanks also for your precious intervention.
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Thanks Ivan
?
Then propose a crossbar along the entire mast.
I am not a technician but building this mast with all this central section becomes difficult to build. To build you must first make the central part then insert in the front and close everything on the rear strip.
?
Bernd's photo is easier to do because you are able to insert the central crossbar and close as you go on to the end ....
With this I am not saying that I don't want to do your idea but I have to understand how to set the work on 11m of mast ....
?
When I made the rudders of the KD 122 Italy I had built the blades differently by first gluing the central strip, then closing the two ends and finally rounding everything ....
?
See this folder? ? ? ??
/g/K-designs-Multihull-Sailboats/album?id=185822
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Re: KD 860 hull with vertical curvature?
David T,
Thank you for the wise words. I'm still weighing it all, and I'm holding off until I can factor all the costs to my wallet and life. I do love a good prolonged project though. I'm lucky to have some experience boatbuilders at hand to help me with the project if I want to proceed, but I find that offerings of help often wane when things get hard, so I need to be able to complete the project on my own.
In the end I might decide to build something smaller, or buy something instead, but to me, the real joy is in the work.
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Wishbone Gaff With a Wood Mast
Hi, Bernd agaain!!
The single biggest investiment in Pelican project seems to be the rig.
So I am researching the options: fixed mast battened sloop, rotating wing mast battened sloop, Wharran wingsail, and others less conventional..
And my clonclusion up to now is that the proposed by Bern wishbone gaff rig is by far the winner.
He seems to always have best, simplest, cheaper and most elegant solution, one that will work fine and is feasible, impressive!
I think I can make a wood version of the aliminun mast shown in the plans with equivalent resitantence and external dimension,
thats because is dificult to find Al6061T6 extrusion to dimensions here in Brasil and I will do a better job with wood than aluminun, time is not a problem to me.
If I start from beging is better or makes more sense to built one that the whole mats rotates or just the wishbone gaff?
Cheers,
Henrique
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Seattle Eco 55 power cat build
Hi all, Thought I should say hello, and share my project. I've been building an Eco 55 for a while now, and have a few photos to share. So far, all is progressing well, and it has been mostly fun. :) I'm planning on electric propulsion, with an Elco? EP-20, a 100 AH lithium battery bank (can expand to 200 AH if needed) and whatever amount of solar panels will fit. It's certainly an experiment, but after thinking it over, I believe it's worth a try. Anyway, as I continue to make it look more like a boat, I'll post again with new pics. Jim   
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Retransverse : [K-Designs-Multihull-Sailboats] Duo 900 Italy
Ivan, I don't understand what you are trying to do. Are you trying to make the neutral axis of the moment of inertia located where the transverse brace is located? If so, you need the distance terms to be squared.
The basic principle is: The moment of inertia is equal to the area of the element multiplied by the distance to the neutral axis squared.
So if this is what you are trying to do, then B = (A*X^2)/Y^2. And the fore and aft moment of inertia, neglecting the plywood would be about: I = (A*X^2) + (B*Y^2). (Note, this neglects the plywood and the individual moment of inertia of area A and area B. But does give a rough, conservative, approximation of the moment of inertia of the spar)
By the way, I see no compelling reason the neutral axis needs to be centered on the transverse. If the solid timber on the nose and the tail are the same species, then they would have the same modulus of elacticity and the same allowable strength. Thus, a neutral axis centered on the spar (X=Y), would produce the stiffest, strongest spar at the least weight.
Also, the plywood skin needs to handle all the shear load in the fore and aft direction and most of the torsional load of the spar. So it cannot be too thin. By the way, it would be more efficient for these loads if the plywood grain was +/- 45-degrees insted of 0/90-degrees.
Finally, just a small amount of carbon fiber instead of much of the solid timber in this section would save lots of weight. Using some would not be terribly expensive.
David
On Tuesday, April 27, 2021, 9:40:31 AM PDT, Ivan <ivan@...> wrote:
Hi Domenico - see attached
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Hi Domenico - see attached
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Re: KD 860 hull with vertical curvature?
Hello Sage, ? Having just completed the build of an Eco 6 catamaran perhaps I can share some advice. You have talked about the material cost of the build, but by far the bigger consideration is the amount of time required to build a boat like the KD860. I was originally was looking at the KD860 and purchased the study plans, Then with the wisdom of years, and previous house and boat building experience I decided to go for the Eco 6 as it would be a more realistic build in terms of the resources I had available, being a place to build the boat, sufficient spare cash to pay for the materials, and something I could realistically complete within about a 2 year time frame. I would have much preferred the KD860 as a boat with all that extra space, but the Eco 6 build was about as much as I wanted to commit myself to. ? It took me two and a half years from start to finish, although I did nothing for about a 5 month period during the first winter due to writing commitments. Building the hulls, and initial join up and cabin superstructure went quickly and easily, but what I found difficult was the final few months with all the finishing and where everything has got to come together. I only work 3 to 4 days a week, so compared to a lot of people who work full time, I did actually have a lot of boatbuilding time available. ? If you have never built a boat before, or undertaken a project like this, my advice would be to build a dinghy first. Maybe download the free plans for the little dinghy Bernd has designed and see how you get on putting that together. But realise that building a boat such as the KD860 is a huge undertaking which will require extraordinary amounts of enthusiasm, energy, and perseverance in order to see the project through to completion. ? Good luck with it, ? David
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Re: KD 860 hull with vertical curvature?
Hi Sage. I don't know if it is accurate but Boulter () sum of all sheet goods except for roof and furniture (that doesn't have a quantity on my list of materials) would be $5,000 US + delivery and taxes. On my last project, I spent about that much on carbon fiber for a new 25-ft aka on a trimaran. The KD 650 is much larger and doesn't use core material. So $5,000 is not too bad.
David
On Monday, April 26, 2021, 10:28:45 AM PDT, Sage Grahame <sage@...> wrote:
Hi David,
Thank you for the link to the Sailboat Wrecking Yard. That will be a great resource! Best of all, it's about 20 minutes from my location.
I'm assuming that the curvature was added to the design by the builder. I too see several alterations in the completed vessels in the video (and others). It seems to be fairly common actually. I have seen a few examples in the videos and photo galleries of "spec" KD 860s, but all builders seem to take some liberties in hatch and window placement, motor mounting, and shape and placement of benches in the cockpit section. It's such a great looking boat and I love seeing what other builders have done.
As far as other materials, I found a local supplier of "tropical marine plywood" which seems to meet the same specs as found on the plans, but prices have skyrocketed lately. I might wait until production stabilizes a bit to buy the sheet goods.
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Bernd Kohler
Bernd Kohler
Henrique Costa Veiga de Carvalho