Hi Domenico
Nice to see some progress on the DUO 900.?
You are working on the boat, or are being in Sicily?
Please make the stems round on the bottom, these will create a lot of resistance.
Otherwise a strange difference between the wood color and the primer
Have fun
Bernd
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Those new Sunfish sails look like they could have usefull applications in your smaller designs Bernd. Nice to see those old images you posted too
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Hi Bernd little updates on the Duo 900 Italy
All tubes ready to be painted together with the hulls.
Sorry for the bad quality of the photos
?
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Huge congratulations on the amazing work. It Makes me feel very humble when I think Of the amateur way I built my Eco 7.5. Little skill and lots of time - 3,5 years. I¡¯m still happy with my boat despite it being nothing like your standard!
Well done maestro.?
Chris.
On Sun, 10 Apr 2022 at 17.49 Bernd Kohler < bernd@...> wrote:
The cabin looks good ;-)))
Thanks Bernd
I made the second cabin version,keeping of the first version.
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Nice job !!!?
Envoy¨¦ depuis mon appareil Galaxy
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The cabin looks good ;-)))
Le samedi 9 avril 2022, 18:09:59 UTC+2, domenicodispaldro@... <domenicodispaldro@...> a ¨¦crit :
Thanks Bernd
I made the second cabin version,keeping of the first version.
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Thanks Bernd
I made the second cabin version,keeping of the first version.
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Hi Domenico
?
What a progress. Great. The cabin looks good.
I like special the photos with you in the picture
Title, "A man and his work"?  Happy easter? Cheers? Bernd
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Hi Bernd
More photos on the construction of the KD 122 Italy due.
Work almost finished, the fiberglass cover is missing and then smooth with epoxy and silica filler.
There will be a 3d drawing for the hull and cabin interior without changing anything structural.
Then I'll take care of the A-frame mast.
Happy Easter to you and to the whole forum
 Buona Pasqua
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Moderated
Re: KD 122 Italy 1 on sale, price reduced
Hi, still available. Please email me for appointment. Brgds Franco
21:06, 7 aprile 2022, "stefano.diving.90@..." <stefano.diving.90@...>:
Hello! If this is still available I will come and inspect it after the 10th of April
--
Sent from Yandex?Mail for mobile
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Moderated
Re: KD 122 Italy 1 on sale, price reduced
Hello! If this is still available I will come and inspect it after the 10th of April
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Moderated
Re: ECO 75 solar electric built in NZ
Hi Bernd, ? There is not a lot of progress as there are many other things which needs to be done. It will be a miracle if I got the boat in the water this year. I¡¯m still sanding the outside while making the interior and the electric outboards. ? Now the weather gets better, I can do more in the same time, as I don¡¯t have to fire the woodstove, and fill it every now and then. ? How are you, and what keeps you busy these days? ? Groeten ? Jack ?
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Show quoted text
Van: [email protected] [mailto:[email protected]] Namens Bernd Kohler
Verzonden: donderdag 17 maart 2022 1:50
Aan: [email protected]
Onderwerp: Re: [K-Designs-Multihull-Sailboats] ECO 75 solar electric built in NZ ? Hi Jack
I am a bad bookkeeper, as far as I know, the plans were sold by Duckworks.
The guy is close-lipped and is keeping a low profile. I got more questions about
his precise whereabouts but I had also no success.
In the article is no information on what motor he uses.?
How far are you? Ready to go this year
Groeten Bernd
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Moderated
KD 122 Italy 1 on sale, price reduced
Hi everyone, I am the owner of a partial yet advanced build of KD 122 One Italy, built by the well-known and respected Domenico DiSpaldro. I stopped the build for personal reasons. To whomever is interested, here is a link to the pics /g/K-designs-Multihull-Sailboats/photosearch?p=created%2C%2CKD122+Italy%2C20%2C2%2C0%2C0&q=KD122+ItalyI am reducing asking price to Euro 10.000, provided the sale is carried out before April 30. The separate hulls are completed (as far as possible) and the rest of the vessel has been cut out, dry-mounted and is ready to be assembled and glued. Included is the project, all the plywood and stringers, AISI316 rudders and ball bearings, biaxial fiberglass, monodirectional carbon fiber, some hatches, etc. It's stored in a shed located 60km West of Venice Airport Feel free to ask whatever questions you have
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Moderated
Re: ECO 75 solar electric built in NZ
Hi Jack
I am a bad bookkeeper, as far as I know, the plans were sold by Duckworks.
The guy is close-lipped and is keeping a low profile. I got more questions about
his precise whereabouts but I had also no success.
In the article is no information on what motor he uses.?
How far are you? Ready to go this year
Groeten Bernd
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Moderated
Someone in Slovakia, Hungary, Czechia or Austria
Hi All
I remember seeing someone from Hungary on here.?
It would be great to meet someone who is building one of Bernd's boats and even have a look at their build. Would anyone be willing to meet up and share a coffee with me? :-)
Look forward to hearing from you
Dale
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Moderated
Re: ECO 75 solar electric built in NZ
I have been running exclusively on solar electric since 2016. A lot of learning curves to overcome. My boat was a small one 18' and a mono hull with a hull speed of 6 knots. My solar panel capacity in 2018 was 860 watts but I would use a 50% rule for estimation of power as you never get full capacity from a solar panel due to time of day and angle of the sun. My motor was a Torqeedo Cruise 2.0 which is rated at 5 HP but to cruise at 4.5 knots it would be about 40%. My longest outing was 16 days using only solar electric power. If you plan to go on an extended trip you need to plan to balance wattage being generated through the day and wattage being drawn by the motor. Speed vs power usage follows an exponential curve. On a sunny day (in Aug) I could cruise for 8 hours at 4.5 knots and after stopping the batteries would continue to charge so I would be ready to go again the next day. If I had a cloudy day I would reduce the speed and distance. I now have built a Eco 5.5 catamaran and am planning some trips this year with it. I have put a link below where I was experimenting with tilting the canopy to maximize solar performance.? For me, I am now a solar electric fanatic.
Phil
On Sunday, March 13, 2022, 05:12:37 a.m. EDT, Gerridae <owly@...> wrote:
??? 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:
?
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.
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Moderated
Re: ECO 75 solar electric built in NZ
Hi Bernd,
I hope he has payed for the plans....!
With what brand and type of motor do he reach this 5 knots of speed, and is this full throttle?
Groeten,? Jack
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Moderated
Re: ECO 75 solar electric built in NZ
I think your calculations are in the ball-park except for discharge of 20kWh of LiFePO4 batteries. For long life, they should not be discharged more than 80%. This means a 20kWh battery bank can only use about 16kWh.
All boats also need reserve capacity for bad weather or other considerations. You are right to ignore this when calculating range. Thus we can directly compare range of vessels with varying power systems. But the real range available to prudent mariners is less.
Recharge is a challenge. Though LiFePO4 batteries charge relatively quickly, they are extremely slow to re-energize compared to liquid fuel. Also, electrical re-fueling infrastructure is extremely poor compared to liquid fuel. Electric boats can rarely pull up to a recharging station to re-energize batteries.
Don't get me wrong, I like electric power. I just do not think most boaters are ready for it. Here where I live at latitude 48, with predominately marine cloud cover, solar panels are less effective. I used 170 Watt solar panel for daily dependable 40 ah battery recharge. There are tens of thousands of miles of semi-protected shoreline to explore here. There are almost no charging stations along all that shoreline.
I know that most boaters are under power for relatively short periods. For them, solar charging systems are more useful. Alternatly, charging stations allow recharge if available. But this limits where the boat can operate since it needs to stay within range of the charging station.
One last thought. Where I live, most boaters have more than one propulsion system. Though there are many anchorages, current and weather considerations make back-up propulsion prudent. So pairing electrical propulsion and sail or diesel and electrical pairing are more suitable than electrical propulsion alone. Thus, a boat could use primarily electrical propulsion with one of these other systems for back-up. This eliminates some of the drawbacks of electrical propulsion alone.
David M
On Sunday, March 13, 2022, 01:12:37 AM PST, Gerridae <owly@...> wrote:
??? 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:
?
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.
|
Bernd Kohler
bryanandmarycox
Bernd Kohler
Nightline
Dale K