30ft displacement boat project

[maksic]

I am starting to working on some project for 30ft diplacement boat. I have some preliminary hull, but I need some coefficients and main dimension ratios to check my model and to go on hydrostatic calculation and other parts of project documentation.

If any of members have some table with, for example ratios L/T, B/T, Cp, Cb, S/L, or something useful data, i will be appreciate to him. I know, many of you will suggest me for some good book, but I just need some coefficients, and in which area they exist, no big literature. I have enough lit. because one naval architect must have them.

Thanks!

[Gilbert]

It seem to me there is a little bit of a language or symbol problem with me understanding exactly what information you are looking for. So I will just list some of the things I would normally like to see in a displacement boat.
1. Beam to length ratio about 1 to 3
2. Cp of about .63 if looking for the best speed under power. Maybe somewhat lower if looking for maximum fuel efficiency.
3. Center of bouyancy about where the maximum beam is.
4. Draft about half the waterline beam.
Then if this gives a boat heavier than you would like lighten up the draft or beam or both. If it is lighter than you would like give it more draft or beam or both.
I hope this is helpful.

[maksic]

You just give me some information that I am looking for. I need just numeric values of Cp, Cb, B/T, and you give me more of that!

If You have some other useful coefficinet values for hull or something like this, please send to me.

Thank you one more time, You are a realy heartful!

If I can help you in some your project, just contact me!

Best regards,
Ivan

[Gilbert]

I have one more suggestion that you might like to make use of; it is a way to approximate the waterline beam and draft you will require if you know about how heavy you want the boat to be.
Multiply the waterline beam by the draft and multiply that by 0.6. Then multiply that by the waterline length you expect to use and then multiply that result by the prismatic coefficient you hope to have and you will have an approximation of the volume the boat will displace. This should eliminated some of the trial and error you might experience just using the suggestions in my previous post.