Stability calcs from Rhino model

[tallen]

I have a hull I made in Rhino and I want to do some damage stability calculations on the hull. What is the best way to go about doing this? Is there any plugins for rhino, other good software that is friendly with rhino hulls. Is any of this software low cost / free?

[CGN]

For Damage stability the "low cost" ones that i have seen are Hyss.xls and the stability module from NewWavesys (Prosurf line of software) Prosurf is around 2000US and Hyss.xls is 750 euros.

Prosurf stability module can read GHS (??), and Hyss is a little bit more work becouse you need to input the curves that defines your model, but it does the job.

[tallen]

How about AutoHydro, or any others that would have a student discount?

[yago]

If you only need it for one boat, you could use the time limited trial version of Rhinomarine, download at www.rhinomarine3d.com

[tallen]

I thought Rhino Marine only does intact stability and not Damage stability

[ABoatGuy]

Tallen,

Rhino can write a GF file which can be read by AutoHydro or GHS, both are full stability packages.

[tallen]

I was wondering what is the best way to do this calculation by hand if no software is accessible to me. Most methods i have seen rely on using a tangent waterline to the margin line... the problem i have is that my bulkhead deck is parrallel to the waterline and it is flat. So can anyone please help! Need this help urgent.

[ABoatGuy]

Stability calculations by hand are extremely tedious. You don't want to go there if you can avoid it. That said if you can find a copy of Skenes Elements of Yacht Design, there are fairly detailed instructions in the back. The book is out of print, but libraries often have copies or try Amazon used books.

Phil

[Martijn_vE]

It's back in print, bought one recently.

[yachtboy]

hi,

Elements of Yacht desing has re print done 2001, so new ones available.

If you need no cost package just for stability you might find
DelftShip usefull. It dose most of work.

But STIX kind of criteria need's something more, I have been working
out own pure calculation system and at near future it's capeable to
calculate 360deg,....

Anyway look at http://www.delftship.net/, just wondering why did not
starting whit hull desing at delftship. Perhaps next time.


joni
http://desing.myjohn.info

ps. if anyone intrested to network, to get projects, to get projects done,
needs company,... welcome to desing.myjohn.info

Originally Posted by ABoatGuy

Stability calculations by hand are extremely tedious. You don't want to go there if you can avoid it. That said if you can find a copy of Skenes Elements of Yacht Design, there are fairly detailed instructions in the back. The book is out of print, but libraries often have copies or try Amazon used books.

Phil

[terhohalme]

I put this first to a wrong thread:

Could this be a suitable solution?

First, calculate hydrostatics with a sound hull and pick up displacement and LCB.

Then cut off the leaking compartment of the model and calculate hydrostatics/CG (use previous LCB and displacement). The model trims and heels nicely.

[Magno]

Cutting a part of the model is valid and is used by some programs for Damaged Stability. But you must also put in mind that, if there is equipment or structural elements inside the compartment that was flooded, the water will not take the place of them. If you do not need more realistic results I think it can be done.

Another thing you can do is put a weight representing the water that entered in the compartment and adjust the water density to consider the presence of solid elements (machinery or structural elements) in the flooded tank.