Model from a study plan

gonzo said:

What is the main goal, to build a boat or to go sailing?

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Hi @gonzo,
The goal is to live aboard while sailing. Not in a floating house, but on a sailboat where I can, in addition to formal qualifications, sail along the Spree/Havel (Berlin), to gain experience on a boat of this size. Then Amsterdam, the English Channel, and the Mediterranean. And only after this know-how, I'll set off on an ocean crossing to the northeast coast of Brazil (my homeland), to the south (Floripa .

"The world is full of boat projects that never got finished..."

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Who knows...

How much experience do you have sailing?

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Not much. I was in the Navy for a few years, but it was a long time ago.

A 40 foot cat can be a handful.

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A smaller can compromises habitability. Don't forget: it's a "sailing house" .

redreuben said:

I would be looking elsewhere for more modern designs, you have given virtually nothing to go on...

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Hi @redreuben,
The goal is to live aboard a sailboat. Not in a floating house, but on a sailboat where I can, in addition to formal qualifications, sail the Spree/Havel (Berlin), to gain experience on a boat of this size. Then Amsterdam, the English Channel, and the Mediterranean. And only after this know-how, set off on an ocean crossing to the northeast coast of Brazil (my homeland) to the south (Floripa . That's the initial idea.

Thanks for the tip. I'll check it for sure!

guzzis3 said:

...free! Mack that and you can see had it is to make a boat! If you do it you have a tender.
Can not rite stell.

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Hi @redreuben,
I didn't get your last sentences. Could you please explain it?

I suppose you want to build a model, digital or real, to study the habitability? Or what do you expect from building a model?
The problem is that you can't really play around with much of "the furniture" or systems without running into trouble. With modern designs a lot of the interior is structural, it's like moving load bearing walls in a house. Heavy items like tanks, engine, etc. affect weight distribution. A lot of it can be solved, but to use the house analogy again, not without the help of a structural engineer who understands what's going on.
In that case it's better to just design the interior you want using some hard limitations (lenght, hull witdth, bridgedeck dimensions) and hire someone to draw a hull around it.

The other use of a model would be to aid production. For that you would have to 3d model the entire boat down to the last bolt position. Then you can decide on subassemblies, jigs, order of installation, etc. This is normally done only on series production boats taking into account the existing facilities and know how. Take for example a furniture module, it can be buildt off the boat and installed as one piece, but you need a crane to do it and know how to work around it's geometry to properly fasten it to the hull and deck taking into account the loads it will see.

Roberts cats are "55% powerboats and 45% sailboats", it's your decision if that suits you, just like if it's worth the 200€ price to play around with a plans for a boat you might or might not decide to build.

Jardel de Olivenbaun said:

Hi @redreuben,
I didn't get your last sentences. Could you please explain it?

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Roberts catamaran plans have no respect from multihull sailers.

...free! Mack that and you can see had it is to make a boat! If you do it you have a tender.
Can not rite stell.

"I didn't get your last sentences. Could you please explain it?"

https://www.mikewalleryachts.com/free-boat-plan

By that, make it. You see wot you have to do to make a hull. Then if you do get a cat you will need a tender.

"It's not aluminum. It's fiberglass + epoxy. The plan from Roberts includes Fiberglass and aluminum."

I know I was joking..

"I hope to make it as soon as possible."

4 - 10 years to belled it!! Not start in 4 to 10. 0 start - 4 ore 10 to pot it in water.

"A smaller can compromises habitability. It's a "sailing house" ."

You can leve in a 26' boat.

@Jardel de Olivenbaun
Buy 500 eur used beach cat .Fix it and sail a bit . It will be cheaper than the model build. You can also buy tent for habitability on deck.
I also wanted to start this way, but unfortunately I like to complicate things.

Jardel de Olivenbaun said:

Hi @gonzo,
The goal is to live aboard while sailing

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In that case, learning boatbuilding and then building a boat is the hard way to do it. There are plenty of used boats that will suit your needs. The amount of money to build a boat, plus the wages you could get by working in any job instead of building a boat, will get you cruising in less time with more money in your bank account.

Jardel de Olivenbaun said:

Hi @gonzo,
The goal is to live aboard while sailing. Not in a floating house, but on a sailboat where I can, in addition to formal qualifications, sail along the Spree/Havel (Berlin), to gain experience on a boat of this size. Then Amsterdam, the English Channel, and the Mediterranean. And only after this know-how, I'll set off on an ocean crossing to the northeast coast of Brazil (my homeland), to the south (Floripa .

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The Roberts cat is essentially a powerboat with a sail attached. Sailing performance will be poor and you will be dissatisfied with it's passage making ability unless you don't mind burning 10 liters of diesel per hour to go 10 kmh. Assuming you even get to that point....

Jardel de Olivenbaun said:

A smaller can compromises habitability. Don't forget: it's a "sailing house" .

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Well, let's say I want to go on a road trip by car and visit all the countries in Europe, but I can't drive. Also for some reason I think I need a Mercedes G-wagen to to this, but I can't afford one. So what should I do? Should I first make a model of a g-wagen and then build one from scratch? And then learn to drive on the car I built? No, this is not the answer. The answer is you learn to drive first, then buy a boat you can afford and go makes some passages. You can buy a boat used for much cheaper than you can build it, it just won't be exactly what you think you need.

All you need to go sailing is a small monohull. Monohulls are not as wonderful as catamarans but they are very cheap on the second hand market. Take a look at Sam Holmes sailing, he goes all over the place on an old cape dory 28 that cost less than $10k. He could sail to Brazil and back before you get your catamaran 10% finished. If you can afford more boat that's fine, but since you're concerned about the $200 cost of the plans I'm guessing that's not the case.

gonzo said:

In that case, learning boatbuilding and then building a boat is the hard way to do it. There are plenty of used boats that will suit your needs. The amount of money to build a boat, plus the wages you could get by working in any job instead of building a boat, will get you cruising in less time with more money in your bank account.

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That's true!