ratio (L/B)

you happy now troy ..nice to see a happy american

 

I am not a representative of the government of Iran, just a student
I Thought that this site is a Scientific site, there is not any way for Policy in Science.
if you are not agree with my country policy, you do not have Permit that say rude things about my Compatriot.
THANKS EVERYBODY THAT ANSWER MY Scientific question

 

(L/B) - this ratio represents the propulsive properties of one vessel ( greater is better )
(B/T) - this ratio represents the stability properties of one vessel ( greater is better )
(L/D) - this ratio represents the strength properties of one vessel ( greater is better )

but as you know if all of these ratios are very high then the ship will have much more disadvantages than advantages ...

 

Quote Perhaps it would have been best for me to keep quiet.

Me too

 

Dina,

the question you have asked is difficult to answer in a single post because it is extremely broad. Any design ratio will have an impact on each one of these ship characteristics:
- powering
- stability
- seakeeping
- maneuverabilty
- structural strength
- trailerabilty (in case of pleasure boats)
If you need to know how L/B affects all of them, a reply would need a space of an entire book chapter.

But if you put your question into a narrower context, you'll make life easier for those who are willing to reply. For example:
- what type of ship are you considering?
- which type of hull?
- what speed range?
- what size and Length/Displacement ratio?
Once these are known, it becomes easier to answer your question.

Cheers

 

Thankyou to all those people who dropped my rep ..I am not bothered and glad more people know about the barbaric practices of justice in Iran ..I hope you will wake up to the screams of 10 year olds having trucks driven over there arms and think of it happening to your own kids.

 

Yeah ok, but perhaps we should concentrate on boating stuff here...

 

Hopefully posters will moderate their comments or at least stay on topic, in the meantime apologies for the discourtesy. We usually do better for new arrivals: welcome to the forum!

The answer to the question is more complicated than the question itself, this is usually the case with boat design. As Daiquiri noted, L/B means Length divided by Beam. Typical values vary widely, ratios of 10:1 and higher are found in some multihulls and kayaks but a typical monohull sail or power boat would have a lower value, and for a small rowing pram it might be less than 2.

This link will take you to a set of documents created by one of our most distinguished members to explain how various retios are used, it is well worth the studying.
http://www.boatdesign.net/forums/bo...ulation-implications-30857-18.html#post353422

This link will take you to the boat forum Wiki page from which you can access all the articles currently available:
http://www.boatdesign.net/wiki/Special:Allpages

Boating has its own language, if you are new to the terms used there are some useful explanations at these links:
http://www.sailinglinks.com/glossary.htm
http://www.seatalk.info/

Carene and FreeShip are very useful and free applications for boat designers and buidlers. I believe the latest version of Carene is Carene2008; it is easy to learn and to start a design with. However FreeShip has more tools, power and flexibility. For a new design, I often start in Carene, export a text file containing the "lines" (Hull dimensions) which can be imported directly into FreeShip, allowing me to access its greater power without much effort. I recommend investing the time to master both. For FreeShip make sure you get the tutorial which is much easier to follow than the more technically-oriented manual.

 

"Greater is better" is an opinion (yours). Don't mix ratio and opinion.
Lister

 

It is not just an opinion ... if you still think so ... please prove that this is wrong

 

Sorry for you you don't get it.
Try harder.
Lister

 

this thread is a genuine embarrassment to us all. Some guy comes in with a perfectly innocent question and the place breaks down into bigoted bedlam. Why, cause he's from Iran ? really ? I think we all owe this guy a huge apology and maybe should do a little self reflection to boot.

OK we've all got our moments but this moment was really ugly and remains so.

I'm just as guilty so don't think I'm trying to take the high ground here. Over on the climate thread I tend to get pretty agro over what I at least perceive to be the ludicrous beliefs of the deniers camp so ya. we're all guilty but really people this poor guy was just looking for a simple answer to a simple question.

If we were kids our parents would tan our hides for acting this way.

 

Generally, I'd agree with you Dan, but having visited the area, long ago, I can honestly say they are kind and nice, unless they suspect you; like, work for, are related too, or are a practicing Jew. Then their real nature shows up. Any people, hell bent on the utter destruction of another, can't possably expect the majority to take them particularly seriously. This is typical throughout the region, but especially prevalent in the fundamentalist ruled areas, such as Iran. They have access to reality, but elect to buy into the hate mongers diatribe, which is telling to say the least. The world is still flat to them and I for one, can't accept the notion that they should be considered in normal conversation, without adding their desire to eradicate the world, of Jews and infidels. Only Muslims are real people, pleeease . . .

 

The first poster must regret the decision to seek our advice. Judging from the circumstances that seem to prevail - at least what we can see in the news media - it is possible that dina must be careful when replying to some of our comments. Perhaps we should show a little more sensitivity.

 

Maybe dina should re-register with a different name and a new location (e.g. USA or North Korea) and people will treat him differently.