Initial Stability Calculation Error in Freeship

[ricardo.halfeld]

I was setting the shape of my boat's hull in Freeship v2.6, a catamaran by the way, and I realized my initial longitudinal stability (KMl) was negative while my transverse stability was ok. So I opened the design hydrostatics and saw the that the longitudinal waterline inertia was also negative, thus making my KMl negative.

Is this a known issue for cats in this Freeship version?

[marshmat]

Hi Ricardo,

Yes, this is a common problem when modelling a catamaran in Freeship. I haven't found any way around it- although, to be fair, I have neither the coding skill or the time to go into the source code and find the problem. For cats, I usually work with only one hull in Freeship, then turn it into a cat in something else- usually Rhino.

[ricardo.halfeld]

Thanks Matt.

Do you know if DelftShip calculates it any better?