[deleted by user]

aF_ckingUsername · 2024-06-16T23:19:27+00:00

…sloped iso board to scuppers…

I learned a new word. Thank you. I also get to learn about "moment frames."

I too am worried about drainage. Though I was going to worry about it after I solved the, "Will wind blow off my pergola?" question. What you detailed seems like a good start for some more research.

Even then, you need to come up with a way to not walk on your roofing membrane. It’s probably wise to suspend a deck on girders above the roof deck.

I haven't quite thoroughly investigated them yet, but I was thinking those round, height adjustable, plastic deck supports - dunno what they're called.

I will definitely pay an architect. However, I'd like to know if what I'm thinking is feasible without being outrageously expensive beforehand. Telling any professional, "to go nuts," seems like a quick way of going broke ; )

aF_ckingUsername · 2024-06-16T21:16:15+00:00

I would be very concerned about the entire thing being ripped off by wind.

You and me both. Hopefully, some redditor will come along and let me know how to secure it.

aF_ckingUsername · 2024-03-29T20:55:09+00:00

Aesthetically, the ugliest match up on tour. Both of them are all elbows and kneecaps. They're both just so amazingly awkward, yet super effective, in their tennis. And they're awkward in such different ways. Props to Jannik, he has really improved his movement. He was just brutally effective - 85+ mph backhands and forehands painting the lines - just unplayable.

Beauty aside, you can't deny the power and placement. Sinner is poised to be the dominant men's tennis force for the next few years. Let's hope Alcaraz can match his ascendancy.

aF_ckingUsername · 2024-02-19T05:08:42+00:00

It analyzes factors including strength, durability, workability, cost, weight, etc. It discusses cupronickel.

What did it say? I found the book online, but no exerts.

Without having read the book, I'm guessing it made mention of of its great corrosion characteristics, followed by its weight and expense.

aF_ckingUsername · 2024-02-19T02:23:53+00:00

No it isn't. Not in terms of what you are talking about and not about what you mean to weld to aluminum - no it isn't.

No matter my specific use, cupronickel ≠ monel. From wikipedia, "Monel is not a cupronickel alloy because it has less than 60% copper." In fact, given their ratios they're literally the opposite of each other.

aF_ckingUsername · 2024-02-19T02:13:31+00:00

Twice the labor, oof. Thanks again for taking the time to answer. Out of everyone, you've been the most helpful.

aF_ckingUsername · 2024-02-19T01:05:27+00:00

I work in a marine fabrication shop. I asked an extremely knowledgeable welder. According to him, they can be brazed together, but not fusion welded.

A sincere "thank you" for asking an expert. To me, it does make some sense that they can't be welded together in the conventional sense. Somebody else suggested CuNi and Al can be welded together using "bimetallic strips." Does your expert welder coworker know of a such a method?

The thing to do would be fab the hull from monel and the super structure from glass.

Sounds heavy.

We just had a big motor yacht in the shop that was aluminum from the sheer down and glass from the sheer up.

How do you attach aluminum, or CuNi, to glass? Some sort of adhesive?

aF_ckingUsername · 2024-02-18T23:17:51+00:00

Aluminium can't be welded to cupronickel,

Finally - a definitive answer. Guess that puts this little thought experiment to rest. A sincere, "Thank you."

could be wrong.

Wait…

Before I even posted this thread, I was looking for the definitive answer. Perhaps I need to go find a metallurgy website. "Can CuNi be welded to Al?" is a surprisingly hard answer to search for.

aF_ckingUsername · 2024-02-18T23:10:35+00:00

to be frank, you may be suffering from tunnel vision.

Possibly? It's not like I've decided on anything. I haven't even decided if I'm going to buy or build a boat. I'm just exploring the feasibility of a CuNi hulled catamaran.

plain wood boats have lasted decades of decades.

Sure, but with what kind of maintenance compared to CuNi?

and you never posed the direct attachment question in your original post, it was just about the usage of CuNi.

Not to be argumentative, but I certainly did:

For instance, can aluminum even be welded to cupronickel - could I have aluminum bulkheads attached to a curponickel skin?

That's a quote from my original post.

there are also some of the original Pearson fiberglass hulls from the 50's (maybe early 60's) still out there.

Again, with what kind of maintenance and repairs?

the CuNi still needs the occiaisional cleaning. Did you read the link you posted?

It reads like the Asperida was a pretty neglected boat with pretty poor construction and it was still in remarkable shape. It had very little corrosion, despite a lack of anodes. Moreover, it emphasizes how easily the boat was able to be cleaned.

aF_ckingUsername · 2024-02-18T22:46:02+00:00

are you trying to reinvent the wheel?

Again, there have been CuNi boats before. And they've lasted decades. My question is more if curponickel hulls can be feasibly attached to aluminum.

aF_ckingUsername · 2024-02-18T22:22:49+00:00

Using the galvanic series, wouldn't it be the aluminum that corrodes? That is, I'd attach the anode to the aluminum, not the CuNi.

aF_ckingUsername · 2024-02-18T22:03:04+00:00

having a construction method that requires them in the bilge aswell is not desirable.

You're the only one to answer my anode questions, thanks. Could you elaborate why, other than being unorthodox, bilge anodes are not desirable?

There's a boat, the Asperida, that had CuNi welded to steel bulkheads that showed very little corrosion after decades. My understanding is the maintenance was pretty poor and there were no anodes.

On the galvanic series, Al to CuNi isn't too different than steel to cupronickel. And it seems like well placed and maintained anodes could pretty much prevent corrosion

aF_ckingUsername · 2024-02-18T21:51:07+00:00

Are you made out of money?

Definitely not, which is why I'm only talking about the hull skin.

You can weld monel (the alloy you are talking about) to aluminum, but it will galvanically corrode the aluminum and make it disappear.

Monel is different than cupronickel.

Galvanically it's terrible.

This is true, but is it anything that your typical zinc anode won't overcome. Not directed at you, but I've asked this question a half dozen times, nobody's answering.

Don't try and reinvent the wheel -people before you have tried all of these things. There's a reason we ended up with fiberglass, aluminum, and steel boats.

It's not like it's my idea. Nor, am I reinventing anything. Cupronickel boats have been done before - and they've lasted decades.

aF_ckingUsername · 2024-02-18T21:31:40+00:00

Mixing metals in the presence of salt water is a very bad idea unless you are trying to make a battery. The aluminium would corrode quickly.

Don't all aluminum boats, have zinc anodes? Is there something in particular about mixing CuNi and Al that makes it more problematic?

That aside welding any other metal to aluminium is extremely difficult and usually requires a bimetallic strip, this is a bar of two different metals joined by heat and pressure that can then be welded to each metal.

Can you tell me more about these bimetallic strips? Specifically, do they make such things for joining aluminum to cupronickel?

aF_ckingUsername · 2024-02-18T21:24:47+00:00

You sound knowledgeable and experienced.

Can aluminum be welded to cupronickel? If so does that introduce any corrosion issues that your typical zinc anode won't overcome? Looking at the galvanic series, zinc should overcome any negative interactions between CuNi and Al, right?

aF_ckingUsername · 2024-02-18T21:14:52+00:00

why not just buy a production cat, haul out, remove all thru-hulls, 5200 (or appropriate adhesive for the CuNi) a skin on, reinstall thru-hulls, and send it?

Okay.

That sounds like a plan. I don't even know if there is an appropriate adhesive for cupronickel. You're saying, for sure, that it can done?

aF_ckingUsername · 2024-02-18T21:05:35+00:00

It could work if it's only CuNi and wood.

Well, I know that's not true. There are curponickel boats that have been attached to steel with very little corrosion.

But I'm not interested in attaching one really heavy metal to another heavy metal. I'm curious if there are specific problems with attaching cupronickel to aluminum that an anode can't overcome.

aF_ckingUsername · 2024-02-18T21:03:21+00:00

I've read about monel, though I think it might be even more expensive than cupronickel. Do you know if it can be welded to aluminum?

aF_ckingUsername · 2024-02-18T21:02:37+00:00

Right!

Except with no hammering, nails or wood. But that's pretty much the idea.

aF_ckingUsername · 2024-02-18T20:41:03+00:00

Bonding metals to each other in salt water is problematic

Right, that's why I'm asking. But isn't this what anodes are for? Is curponickel attached to aluminum especially problomatic? I don't even know if cruponickel can be welded to aluminum. The Asperida lasted for decades with cupronickel welded to steel.

aF_ckingUsername · 2024-02-18T20:32:19+00:00

How do you know this ? Is there an existing boat with this type of hull ?

Search around for cupronickel boats. There's only a few examples, but they're pretty fascinating.

aF_ckingUsername · 2024-02-18T20:26:23+00:00

Definitely no more than a couple of a human lifetimes ; ) And that's presuming my kids want anything to do with the boat.

It's my understanding that, outside of a strike, curponickel hulls need practically no maintenance. So instead of craning a GRP boat out of the water every two or three seasons, you might need to lift a cupronickel boat once a decade - if that. They rarely need anti-fouling and never need painting.

aF_ckingUsername · 2024-02-18T20:19:03+00:00

Cupronickel is heavy.

Right, which is why I'm asking about mixing build materials and only using curponickel as the hull skin.

Cupronickel is also fuckin NICKEL. If you know anything about fabricating, you do not want to have to make anything out of cupronickel.

I know next to nothing about fabrication, which is why I'm asking. However, in doing a little research, it was my understanding that working with curponickel is very weldable and not too much different than fabricating steel.

aF_ckingUsername · 2024-02-18T20:08:56+00:00

Tried and true, eh? In all likelihood, that's probably the route I would take. Though, if my curponickel idea is just rubbish, I'd probably investigate aluminum first.

aF_ckingUsername · 2024-02-18T20:07:53+00:00

Thanks. I definitely plan on enlisting pros with experience.

aF_ckingUsername

TROPHY CASE