[email protected]

From: [email protected] [mailto:[email protected]] On Behalf Of Bernd Kohler
Sent: Sunday, 13 March 2022 9:43 a.m.
To: [email protected]
Subject: [Special] [K-Designs-Multihull-Sailboats] ECO 75 solar electric built in NZ

?

It is surprising how many of my boats are sailing the world, and I know nothing about them.

Here is a solar electric ECO 75 sailing in New Zealand. I found the article and the photos in the Junk Rig Association magazine.

Interesting is his way of living and trying to have a low footprint. I will try to find him so that I can use his article. Here are some important facts.
The boat is built according to plan in12 weeks spread over a year. He added Kevlar on the bottom.
Only four of the 6 solar panels are used to recharge the Lithium batteries. Boat speed with the setup as is today around 5 knots.
Can be about 8 knots with a second e-motor. He is also thinking to use a 20m2 kite for long distances.
I will try to find the owner and get some more information.

Re: ECO 75 solar electric built in NZ

#9246

开云体育

??? We are reaching the point where electric power will soon "pencil" at least as auxiliary.?? Weight of the batteries is the killer here, especially where multihulls are concerned with their minimal load capacity.?? Let's say 20kwh of lithium ion batteries are at about 120kg......... a fairly realistic figure.?? 1 hp is about .75 kw.? Lets say you are running 5 hp = 3.75 kw??? 20kwh is 20 kw for one hour.?? That works out to 5.3 hours at 5 hp out of 120kg or 264 lbs.??? That means that to have a steady 5 horsepower output for 10 hours is going to take almost exactly 500 lbs of batteries.?? That's not that bad when one considers engine weight and fuel weight for a gas or diesel engine.?? But it's only 10 hours.?? With sufficient solar power one could get quite a bit of propulsion direct on a clear day.?? Let's say 18w per square foot of solar panel, and that's 208.3 square feet of panel.? That would be a solar array of 20.8' x 10' or 12' x 17.36'... etc.? That's a LOT of solar, and it's NOT charging batteries, just delivering 5 HP to the prop.??

??? It's obvious that at this point we can only use solar electric along with wind realistically.?? It can provide additional propulsion in light winds, propulsion in port, get us through the doldrums perhaps, and perhaps break our bond with fossil fuels.? We can run the galley, etc with battery electric, and we can also generate with regen, or a wind charger.?? And we can run the watermaker......... all depending on conditions.??? It means that you can pull into port, set anchor, and NOT haul fuel, propane, or water when you are voyaging.??? This is exciting stuff if you look at the whole picture.? We can also look at increasing solar panel efficiency, and battery density to the point that this will make more and more sense over time.

??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? H.W.

On 3/12/22 1:43 PM, Bernd Kohler wrote:

Show quoted text

?

It is surprising how many of my boats are sailing the world, and I know nothing about them.

Here is a solar electric ECO 75 sailing in New Zealand. I found the article and the photos in the Junk Rig Association magazine.

Interesting is his way of living and trying to have a low footprint. I will try to find him so that I can use his article. Here are some important facts.
The boat is built according to plan in12 weeks spread over a year. He added Kevlar on the bottom.
Only four of the 6 solar panels are used to recharge the Lithium batteries. Boat speed with the setup as is today around 5 knots.
Can be about 8 knots with a second e-motor. He is also thinking to use a 20m2 kite for long distances.
I will try to find the owner and get some more information.

Re: ECO 75 solar electric built in NZ

#9245

Talking about your boats around the world, have you seen this one?
Sailing on 30knots wind...

??

This is a cool video
.

Re: ECO 75 solar electric built in NZ

#9244

Beautiful boat!!! impressive how fast he managed to build.

Re: ECO 75 solar electric built in NZ

#9243

开云体育

??

Show quoted text

-------- Message d'origine --------

De : Bernd Kohler <ikarus342000@...>

Date : 12/03/2022 21:43 (GMT+01:00)

? : [email protected]

Objet : [Special] [K-Designs-Multihull-Sailboats] ECO 75 solar electric built in NZ

?

It is surprising how many of my boats are sailing the world, and I know nothing about them.

Here is a solar electric ECO 75 sailing in New Zealand. I found the article and the photos in the Junk Rig Association magazine.

Interesting is his way of living and trying to have a low footprint. I will try to find him so that I can use his article. Here are some important facts.
The boat is built according to plan in12 weeks spread over a year. He added Kevlar on the bottom.
Only four of the 6 solar panels are used to recharge the Lithium batteries. Boat speed with the setup as is today around 5 knots.
Can be about 8 knots with a second e-motor. He is also thinking to use a 20m2 kite for long distances.
I will try to find the owner and get some more information.

ECO 75 solar electric built in NZ

#9242

?

It is surprising how many of my boats are sailing the world, and I know nothing about them.

Here is a solar electric ECO 75 sailing in New Zealand. I found the article and the photos in the Junk Rig Association magazine.

Interesting is his way of living and trying to have a low footprint. I will try to find him so that I can use his article. Here are some important facts.
The boat is built according to plan in12 weeks spread over a year. He added Kevlar on the bottom.
Only four of the 6 solar panels are used to recharge the Lithium batteries. Boat speed with the setup as is today around 5 knots.
Can be about 8 knots with a second e-motor. He is also thinking to use a 20m2 kite for long distances.
I will try to find the owner and get some more information.

ECO75sunshine.jpg

ECO75solel.jpg

Re: Waiting for Study Plans

#9241

Hi Bernd

Thanks for getting back to me so quickly. I apologize, you had already responded to my wife's email and resent the study plan. Not sure what happened the first time around but we have got them in hand now :-).

Many Thanks

Dale

Re: Waiting for Study Plans

#9240

Hi Dale

I have no clue how this could happen. I have just posted the ECO 5.5 to the email address provited.?
Would you please also look in your Spam folder please?

Sorry

Bernd

Re: Where to start?

#9239

Hi All

I just wanted to give you an update as you were all so helpful with my boat building journey.

So, after shopping around and thinking of different ideas for boats, I have decided to enjoy the time with my kids while I am young. I bought a small Walker Bay dinghy with the ribs and sailing kit. It is obviously a huge difference between a proper cabin sail boat and a sailing dinghy but there is good reason for it. This dinghy weights about 27kg and fits at my house, so no storage costs and we can go to all these small lakes and rivers nearby. It also means I can teach my wife and kids about being on the water.?

In the meantime, I will finish the reconstruction of my house and complete the Eco5 as my first real boat build. I plan to build it over 2 years and then use it for local river sailing. Trips to Budapest & Vienna with a small cabin to sleep in. Long-term, I will build something bigger with the help of a small team of tradesmen. I still love the Pelican or even the Manta with the aim to move aboard in 2032 and then sail. sail. sail (this has been my retirement plan for some time :-)).

Thank you once again for your inputs. It has been more useful than you can imagine.?

Waiting for Study Plans

#9238

Hi Bernd

My wife ordered the study plans for the Eco5.5 from your site quite a few weeks ago. She sent a couple of emails but we haven't had a response. Maybe it ended up in spam. Could you have a look - noemikirkwood@...?- it was paid via PayPal.

Thanks

Dale

Re: KD 122

#9237

Hi Patrick great job as always ;-)

Re: KD 122 Italy two build

#9236

Hi Bernd

New photos on the construction of the KD 122 Italy 2

For the moment everything is ok, the project is going well ...

Bye

Album foto??/g/K-designs-Multihull-Sailboats/album?p=Taken%2C%2C%2C20%2C1%2C60%2C0&jump=1&id=269251

Re: Duo 1000 project for sale

#9235

开云体育

Tnx.

Well, looks like Harold is gonna get the hull and stuff I already built for free this week, on the condition that he finishes the project in a decent way and I get to sail it one day.

Harold got financially hit by the corona and can't find money right now to buy it. But he is serious in getting the job done. So for the sake of the dream I pass it on and settle with the loss.

Show quoted text

Op 26 feb. 2022, om 21:39 heeft Dale K <dalekirkwood@...> het volgende geschreven:

Sad to read this. Have you managed a sale? What kind of money are you thinking??

As per my previous posts on other threads, it's ultimately probably too much for me right now but still interested in asking.?

Sorry to hear it isn't working out for you.?

Re: Duo 1000 project for sale

#9234

Sad to read this. Have you managed a sale? What kind of money are you thinking??

As per my previous posts on other threads, it's ultimately probably too much for me right now but still interested in asking.?

Sorry to hear it isn't working out for you.?

Re: KD 122

#9233

Another pic in the D.R. Voyager album.
We have been moving forward even in the cold in a few warm weather windows and also in the small insulated box inside the shed.?

Since I last posted, we have glassed the tumblehome on both sides, glassed the cabin sides, finished and glassed the cabin roof, fitted the aft crossbeam and the catwalk beams, and numerous other small jobs.?

Thanks everyone for the good discussions and helpful pictures that have been posted. I look at our boat so often I am not really aware of what would be interesting to see. Let me know if there are specific parts you would like to see.?

Patrick

A Little More Cataproa Work

#9232

Outside commitments and cold weather have limited my work on my modified Cataproa. But I made some changes to the rig and the carbon mast is now built and getting painted. I will attach pictures of the updated rig. I moved the rig aft a little and substituted a jib boom for the original Camberspar. The jib boom pivots in line with the headstay (almost) so that the aft end of it does not lift and ease the jib leech when sheeting out. The smallest camberspar made was much too big for this boat.

My web page has a few pictures of the structually complete carbon mast at:

David M

SailPlan2.jpg

SailPlan1.jpg

Re: KD 122

#9231

Hi Antonio
Is Domenico building the KD 122 for you, or you are helping Domenico?
To tell what would be the layup to strengthen the masts accordingly can be not done here
Because this is a general forum. Individual changes in the design. Which this is, has to be?
discussed with me as the designer

Re: KD 122

#9230

Hi Antonio

I am sorry I do not know how to help you with this information. But I am surprised nobody else here can either. Maybe everyone has left town for the holidays

regards Bryan??

KD 122

#9229

I'm Antonio Rondanini I'm building the KD 122 with Domenico Dispaldro, we built one of the two trees, oval in shape: 45 × 15cm at the base and 25 × 8.5cm at the top, height 13.20m, H continuous in Douglas fir and okumè plywood 4mm; we would like to cover it with carbon fiber and epoxy but we don't know what type and weight to use, can you help us?

Re: Deleted album DUO 800S Australia #photo-notice

#9228

Hi Andrew Klees I don't think I do business here on the forum and I'll explain.

As I told you I bought four projects from Bernd (KD 860, DUO 800, DUO 900 AND ECO 75 power) and of these four I built the KD860 2013 and 2021 the Duo 900 that I will soon finish.

In recent years I have been privately contacted by people registered on this forum, who bought Bernd's plans to try to help them build (paying for it is clear) their boat. These are the two customers of the KD122 the first and now the second.

I always asked Bernd if these people had bought the plans from him and he confirmed that everything was ok.

At the time of the construction of the two KD122s I asked Bernd if he wanted the photos of the construction and he said yes. This is why I opened the KD122 Italy albums and soon one of these two customers will write on the forum to share the construction of the A-frame mast, as we are building it and posting photos here on the forum.

I'm always here for everyone (when I can) if they ask me.

The other boats I have made I have not put anything on the forum but I met Bernd in person in Italy, three beautiful days, we exchanged many ideas and he is always available. Everything can be said, but hearing MISERABLE plans seems to me to be unfair and polite, since there are so many of us here ....

I too have found errors in my four projects and in the two KD 122s but it doesn't get any better at that price and before building you have to read the project well for several months.

bye

?

PS if one day I buy another project it will be the DUO105 which in my opinion has a fantastic line as well as being a fast boat-