Subject: Re: [harryproa] Re: extruded polystyrene core questions
From: "=?UTF-8?B?QmrDtnJu?= bjornmail@gmail.com [harryproa]" <harryproa@yahoogroups.com.au>
Date: 5/21/2018, 9:14 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

Maybe worth mentioning is that this Trinardo was planned to get a wooden deck, which the builder says is to get a nice "wooden boat feeling". But it might also be due to the properties of the XPS. Also worth mentioning is that on this boat, the boards and rudders are located in the outriggers/amas (from a Tornado catamaran). So there will be no centerboard or rudder loads on the XPS-cored hull.

So what do you think, would this Trinardo survive 10 years of Swedish summer/winter?
10 winters has actually already passed since he started building this hull, so if it still exists somewhere in his backyard, it might, or might not, show signs of the delamination Rick W mentions. The builder lives in Stockholm, and from what I have found, he retired 2 years ago after what looks like a successful career. So he should now be enjoying his life as a retiree. And if he is not too busy, and hasn't completely lost interest in his trimaran, I will try to arrange a visit next time I visit Stockholm. If I can get hold of him.
Someone left a comment on his youtube-video of an animation of the Trinardo, 2 weeks ago. Was that by any of you guys? I think it can't be a pure coincidence that the only comment on a 10 year old video was posted while this thread was active.

/Björn

On Mon, May 21, 2018 at 2:22 PM, Björn <bjornmail@gmail.com> wrote:
In case you haven't seen it, in the following link you can see how the 700kPa (100PSI) XPS compares to other XPS and Divinycell H60 in compression.

http://www.trinardo.com/y.a.t-yetanothertrinadofoamcompare3

The site also shows pictures from the start of the build of a ~21 ft trimaran main-hull with 10mm 700kPa XPS as core material. The site hasn't been updated in soon 10 years, and the guy didn't respond to an email I sent a couple of years ago, so I guess he stopped building. Boat has nice shapes, and looks like the build method is similar to how the homebuilt Corsair trimarans are built.

I will actually make another attempt at contacting him, since we are both in Sweden.

On Sat, May 12, 2018 at 2:06 AM, '.' eruttan@yahoo.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
 



>Do you feel these comments are adding something useful to a complex conversation thread exploring the in's and out's of different core materials?

 Do you feel this is 'a complex conversation'?

IMHO, this has become a discussion of feelings and guesses. Something it was not recently. I see no hard data or information being discussed currently. If I am wrong, I am open to having the hard data or complexity pointed out to me.

>The attitude isn't needed for those who agree with you. And for those who don't yet agree with you, it's not going to help sway opinions.

 I am not sure anyone should value those who agree with them solely because they agree with them! Do you?

This is not a popularity or consensus building event in my eyes. There is physical reality here, and it can be engaged directly. I do not see how the properties of any material we have discussed is influenced by popular opinion and winning friends, or the converse. Do you?

>What's particularly confusing is that StoneTool has been supportive of XPS, at least for certain uses. Why get testy with an ally?

 I am very confused that you view my points as me getting testy with him. If it was unclear, i was mocking him. Again, I do not understand how a discussion of the physical properties of boat building materials intersects with the political. But, again, I am open to having it pointed out.

This thread has documented and discussed the grades and costs of various materials, the requirements to engineer a panel, and the properties needed in that core material. Also, we have discussed what properties are less relevant to panel construction.

Do you feel the 'bendiness' of a random piece of foam adds to that? Or can you point some sort of value added to this factual discussion in the recent discussion?

I mean, we love everyone. And every input is valued. Right?



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