Length to Beam Ratio

[catamarans]

How does length affect stability? If a cat has a 2:1 L/B ratio and
it's 40 feet long, how does its stability change if it's stretched to
50 feet long, yet keeping the beam constant, assuming everything else
remains constant? Better, worse, or no change? Is there a standard
way to calculate that?

[henryvand]

I suggest you check out www.themultihull.com If you search you will probably find existing discussions on your topic in forums.