Best resource for learning to calculate scantlings

Well, honestly, I don't see this relationship as directly proportional to displacement. There's a design pressure that depends on full-load displacement raised to the power of 0.33, but there's no direct relationship. You have to add some summand and apply some correction factors. I'm also thinking about the bulkhead scantlings, which don't depend at all on displacement. But, well, maybe I'm wrong.

 

You are wrong. Read the OP's post. He is increasing all scantlings by a multiplier

 

No, @gonzo, I'm not wrong. What I'm saying is completely accurate. What's completely incorrect is what you say in this sentence.

 

Have you heard of the Palindrome? 30ft SOF proa

Proa File | Palindrome: skin-on-frame proa for the R2AK https://proafile.com/multihull-boats/article/palindrome-sof-proa-for-the-r2ak

 

That is interesting, have they actually taken it anywhere?

 

I think he went some way on it as from a couple of articles I read he cruised up the coast of usa to go to a race and stopped off working along the way. I believe someone else has it now, it was some time ago that I looked into it

 

Also ISO 12215-5 has scantlings calcs in I think and 12215-7 (Determination of loads for multihulls
and of their local scantlings using 12215-5) may be of interest

 

I wouldn't tell anyone I was going to learn how to calculate scantlings using ISO, because at least the scantling standards are the least educational thing ever written. You need to know how to calculate scantlings to understand and use these standards correctly. But, fortunately or unfortunately, for small boats it's the best (or least bad) thing available.
I have several texts that attempt to teach, with the help of specialized software, how to perform calculations using ISO 12215. Although the texts cover the basics of elasticity (beam and thin plate theory), the user should have some background in these topics before starting to work.

 

What TANSL states is correct. Scantling guides (ISO or Class Society) exist only for two reasons: First, they give the minimum requirements to satisfy governmental and/or insurance risk moderation. Second, they make it easy for for an inspector to verify compliance for given actual design. Compliance with Scantling guides (ISO or Class Society) does not guarantee that the hull strength is suitable for the vessels intended purpose, only that it minimizes presumed risk.