What are some of the design features that improve stability in boats?

Including catamarans

 

Beam, length, displacement (more->better), Cg and Ce (lower->better) mostly but other things too, pretty much everything more or less ..

 

It kinda depends on whether you are trying to improve static stability, ultimate stability or dynamic stability. Static stability is easy to nail down and what most people think of when they think of stability. The other two can be somewhat at odds with static stability so its a bit misleading to make blank statements about improvements in stability without specifying what type of stability you are trying to improve.

Static stability is more or less the ability of the boat to resist a tipping motion at rest.

Ultimate stability is the ability of the boat to right itself from a capsize

Dynamic stability is the ability of the boat to dampen motion and resist capsize from wave and wind actions while underway.

Which type of stability did you have in mind?

 

They are all interrelated , IMO, and that is the problem. Change one, and you change the other.

How do do you get the catamaran to right itself?
Answer: It is a situation I will not encounter.

 

Same here as in your other thread:

provide more substantial information about your goal and the vessel in question, to get some serious replies.

These broad questions are senseless.

 

I agree with apex1, you need to provide more information to get a better answer, but for starters, look into multi hull designs

http://en.wikipedia.org/wiki/Multihull

 

______________________________________________

80 foot round hull outrigger . Steel sailboat . fluids are high in the
hull . Outrigger folds under ..
Easy to roll the boat , for maintaince .
Builders use intuition , or they dont build good boats .
This boat is convenient , easy to sail .
All sails are wired luffs , well battened .. .
Its about cost and how fast it can be built . Its steel , masts are
thin tube , forged to high strength . Shrouds are 50% , stays
are 100% .

trampoline is for fair WX fun , because the hull is round , no flat
spots , only teak running boards . .
Aux is several Honda B18b Turbo variable cam timing , ultra high economy
engines . Its a new technology , Turbo has no waste gate for the VAR intake
cam timing . Intake CAM retards to drop the pressure at the TURBO inlet .

It can get a car , 120 mpg .

The hull is fast

 

That was a good one! But the wrong thread!
Here it is at home:
http://www.boatdesign.net/forums/open-discussion/boat-jokes-we-need-few-laughs-14472-299.html

 

Welcome,

 

______ 2buildboat ____________

Start at the beginning .... and when you reach the end ,, STOP ,
said the Queen ..

This discussion seams to have lost all PROCEEDURE .

We need to have a real NEED , then proceed to build a better boat ..
nixing all the arguements ... Just build it , and if one finds he is good at building , keep building , but dont get distracted , by ADVISSING others .
Just build , and if you see a demand for your build , then offer a simple
description of the improvements in your design .
I like to build , not post . I enjoy finding my peers , others
who enjoy building . I do lots of stuff , like Ham Radio , digital modes ,
things i can use to make my life more convenient , so i can spend more
time on boats .. I hate trivial , that takes me away from bat design ..
We will soon get new radios , No commercials .. Wifi in PC , will
soon link local , kill all commercial comm' ...
The public will also get SWL . from 10 to 50 MHZ bands , all digital
and FREE , just buy the hardware .

Back to boats . My logic on a round hull , outrigger sailboat ,
is ts easy to roll the hull , which in the long run , makes good stability ,
Whereas common boats that have ballast for smooth , easy motion ,
are slaved to that lead ballast . Thus outrigger . its more complicated ,
but i can work with outrigger easier . KC7CC Ham Radio

 

http://www.youtube.com/watch?v=7w7DXA68R4Iprimarily deep draught

http://www.youtube.com/watch?v=7w7DXA68R4I

 

Welcome. You know... You are allowed complete sentences so we can understand what you mean.