Scantling calculations for GRP Boat

Hey there. I know there are relevant threads to my question but i am still not able to figure out. I want to calculate hull thickness, girder and frames spacing and thickness for my high speed boat. I have modelled my hull form but i am unable to get proper output for scantling calculations. Can someone provide me relevant formulas or any excel tool from which i can calculate spacing and required strength. Thanks

 

Welcome to the Forums!

Start reading here...
Marine design manual for fiberglass reinforced plastics : Gibbs & Cox : Free Download, Borrow, and Streaming : Internet Archive https://archive.org/details/marinedesignmanu00gibb/mode/2up

Then get a copy of this and read it.
Theory of Composites Design | PDF https://www.scribd.com/doc/191310370/Theory-of-Composites-Design

Finally you can move to this.
http://www.shipstructure.org/pdf/439.pdf

and this...
MICMAC 6.0 – Think composites https://www.think-composites.com/software/micmac/

 

The most elementary guide is Dave Gerr's Elements of Boat Strength. I recommend you read it cover to cover. It takes maybe 4-8 hours to get through. I think his scantlings are a bit heavy...

 

Definitely
@Jr NA welcome to the forum.
If you want to design and calculate your boat in accordance with current trends and procedures, use current regulations, which are already very complete and specific, and forget procedures from the last century. Procedures and requirements, fortunately, have changed a lot and what was acceptable 25 years ago is no longer acceptable. Contact me, if you wish, to make adequate and current calculations for your boat.
Good luck with your project.

 

Thankyou for the response. I need your guidance for my work. please can i reach you. The website link is not accessible for me. I dont know why.

 

Jr NA,

Welcome to the Forum.

I admire your interest in wanting to learn boat design.
I would suggest, while you're studying, you build a small boat from a proven design.
Is there a proven, high-speed boat design you like that you would consider building while you study design?

 

Yes sir, I would love to.

 

If you also go to the DNV website and download their 'older' rules around 2015/16, for high speed craft.
Those rules for composites are very easy to follow and will give you a robust structure too.

 

I'm not sure that is the correct. Composite engineering, and/or composite design, is like learning any language. First you need to go way back and learn what the characters mean. Then you need to learn the syntax. Then you need to read the literature for context. Finally you can advance the language. I would never recommend dropping someone down into the middle of Tolstoy or Dostoevsky without prep work.

 

I see your point and largely agree with you, but not in this context.
We don't know what prep work the OP has, or hasn't, done.
You already gave him a bunch of presumably appropriate entry-level links.
(S)he's received some other great input so far on the thread.

I applaud TANSL for dropping, possibly, too much information in the OP's lap.

More importantly, what did you think of TANSL's literature, Jr NA?

 

I am highly obliged to all members for such a great response. I found both of the advices very valuable. @jehardiman input will give me deep insight and understanding of GRP as I am working on entry level. However, @TANSL reply will help me complete my task with exact solution.

 

Visit macnaughton group naval architect online for their Sheath Stripped Rules

 

Gerr is very specific that his method only works up to moderate speeds. The OP needs to open the engineering books and papers for a high speed boat.

 

Even for a low speed boat, I would not recommend using that book, if the boat has to be approved by some administration or delegated entity.