Hello David

Nice to have you on board. Just checked your blog. The Cataproa has a lot of potentials. Good that you are a professional.
A small increase in size makes a big difference. My goal with the boat is, to get with a low cost build a lot of customers on the water. With the lowest possible cost.
You are going a step further.
Folding arrangement is now part of the plans.
One remark. Please stay with two rudders like on a catamaran. This is one of the features the boat maneuvers like a dingy. All owners are full of admiration about this fact

Cheers
Bernd

I am just starting a Cataproa. I had to make some changes to fit my needs. You can see them here on my blog:
I am collecting materials and retrofitting my carbon mast now. Hull construction will start in a few months.
David, Bainbridge Island WA, USA

Hi Philip,

thank you for the nice article. I'm thinking about a new bigger sail with wide seam for the next ?season. Sorry about your mast,

I build my mast from an older wave surfing mast and two layers of 500 g/ sqm UD Carbon and it works very well. But till now no real stronger winds :)

I think, you build a very special platform and I like your ?nice motor mount.

Cheers,

Harald

Hi Philip

No, make him 60mm

Cheers
Bernd

Any thoughts about my questions?

Hi, I do not know the material you mention. Normally they are made from 120 gr/2 dacron sail loth.?
But in some countries, big lateen sails are made of poly tarpaulin material.

Bernd

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I'm interested in Latin sails - are they sewn from repurposed togas? ;-)

Hi Philip
Sorry to hear that you broke your mast. Hold the mast as short as possible. Good thing is, that Latin sails do not need a long mast.
I like your sail. I was thinking in the same direction. The sail would be even more effective with a sleeve. And not only that. A lot faster to rig.
I made also some sketches, but somehow they disappeared in my file jungle.?
By the way. I like your article. Could you send him to Duckworks and "Smal boats magazin" The later has already puplished an article from the ECO 5.5 power cat.?

Cheers

Bernd

Hi Philip,

did you design and build the 12 sqm sail by yourself? It will be nice, to get some advice from you:)
The boom and the spar are now longer to get more sail area?

Thank you from Germany,

Harald

Here is the link.
http://runningtideyachts.com/sail/

Regarding the lithium-ion batteries above...

As often happens in such matters, I read about the environmental impact of lithium mining *after* buying a couple big lithium batteries. I can't say for certain that information would have changed my plans, but I would have preferred having greater knowledge prior to deciding.

On a positive note, my googling on the subject produced this somewhat encouraging report:?

For all the electric powered boat enthusiasts
Here is a link to Rick's? wiring on his ECO?
https://www.youtube.com/watch?v=bwC6UaQbgB8&t=83s

Hi Jim
Looks interesting. Everybody has his own speed. I have very good experience with Rutland wind generators. Very good output. Never a problem.
Worked well also in low wind speeds. Got noisier above wind force 7.
As we sold the boat after 11 years still going strong. For sail catamarans. They can not work in the lee of the sail.?
Have fun

Bernd

Hi all again, and thanks for the comments!

Here are a few more progress photos, and yes, I'm working rather slowly. :)? I've changed course a bit and wound up with a Karvin (Czech Republic) 6800 outboard and batteries from Lithium Battery Power (Florida). I've also been looking at wind generators...

Links:???

Jim

Hi Greg
General, on the bow's underwater parts, has nothing changed. Fewer parts necessary.
It is a complete overhaul of the boat. For instance, the main beam is changed too. Again, shorter building time.
In total, almost 150 pieces less necessary to build the boat. This means a shorter construction time.
The great change is of course in the rig. Regretful, I have to say. But the parallel rig is simple to expensive.
The stability with the new rig is comparable. This was for me a main argument to change to this rig.
For the mast, I propose to use a Isomat NG51 section.
There are also some improvements. One is the addition of steps. The arrangement is comparable to the ECO 6.?
The permanent Bimini can be opened in the center.
It is a work in progress. But as good as ready. Next week the new study plan will be ready

Cheers

Bernd
?

Hi Bernd, The updated Duo 1000 really looks good - particularly like the new bow. I assume the study prints have been updated to include the changes?

What length of mast and section size would be recommended?

cheers
Greg Walter

Hi Mitch
Designing a boat is a complex affair. You have to think abut many things, make a lot of calculations, plus the experience as a designer, and a practicing sailor (since 69 years!) and boat builder play a role.
Then a boat emerges, designed with all these inputs. One of these designs is the 520.
To use a sloop rig for this boat will not work. A mast has a significant down force. How to manage the load in this boat. With another bulkhead, and then, there is no room for anything left.
You had here so many inputs to solve problems. There comes a point, you stick to the plans, or as David mentioned, change to another design. The ECO 5.5 would be then a logical choice.?
Bernd

As far as roller furling sails go, I remember Bernd saying that it is possible to partially furl a head sail with a wire luff (not a stiff extrusion) if the sail is cut flat enough. My understanding is that you can loosen the outhaul or sheet (depending on if you have a boom or not) a little if you want a little more shape to the sail. I think it might work to partially furl a continuous line furler also if you have each side of the loop running through a cam cleat. You just have to keep some tension on both sides of the line when you partially furl. I don’t have personal experience doing that, but I am considering it for our boat.?

Patrick