how about an engineering forum?

[dionysis]

hello all,

There are, i suppose a lot of do it yourselfers, and i think there would be a lot of interest in an engineering forum, designed to share engineering formulae, ways of understanding structures, columns beams, bending moments, stress etc, and related info, what do you think?

cheers, dionysis.

[duluthboats]

[Dim]

Dear Dionysis,

I shall refrain from that to write,
but I shall read with large interest.

Dim.

[yipster]

sounds just great! i vote YES -but- who is going to teach us and there allready is a boatdesign, boatbuilding, wooden boat, O1 and O2 forum. still i like the idea very much!

[Polarity]

Excellent ... But I would suggest a few well populated thread(s) first before a forum. But as a super/megayacht engineer count me in!

[yipster]

ok, first -easy- question...

anyone here with some data on piping in aliminnium, carbon, steel (anodized/galvanized) bending moments, weights, pricing etc?

[Dim]

Yipster,
just first-easy-answer:

www.stainless.nl

You need registration.

Cheers Dim.

[yipster]

thank you Dim, its even dutch! waiting for a week now on a carbon piping info request at http://www.vink.com/

[Dim]

Not waiting, Yipster.

Please: http://www.rautaruukki.fi

Dim.

[gonzo]

Uhh, are we supposed to do math? I thought it was all about the pretty pictures. I'm all for it. Seems like a good idea to have formulae and related information all together.

[Dim]

Dear Gonzo,

Let's forget this delirium with pretty pictures !
Only business !

Let's go.

Dim.

[dionysis]

Seems lots of people like the idea, the question is where to post the engineering questions, just to start things up.

Anyway, here is my question:

There is little info on the web, for designing your own freestanding cat rigged mast. To do that you need to be able the model the forces in the sail correctly, before you can get to the engineering part. My initial idea is in the attachment

Anybody got a better model.

cheers, dionysis.

[dionysis]

woops! here it is:

[IMG]loads on sail[/IMG]

dionysis

[SailDesign]

Dionysis - I just treat it as a beam with sail area centered at the mid-luff. Compression due to sail and boom is so small in comparison to bending loads that it just disappears.
Steve
PS - for pipe calcs, I use http://www.herne.com/nps.htm

[dionysis]

saildesign,

I am prepared to accept your interpretation, but how am I to calculate the amount of taper of this cantilever beam?

I am aiming for the safest and lightest mast .

thanks for the imput, dionysis.