Capsize screening formula

[sandy stone]

Originally Posted by thomm225

The 2.00 number was strictly a racing requirement which occurred after Fastnet '79.

It had nothing to do with Blue water vs Coastal Cruisers, but just looking at the boats it's pretty obvious that those with a lower Capsize Screening Formula are more seaworthy

https://sailboatdata.com/sailboat/bristol-27

https://sailboatdata.com/sailboat/great-dane-28

https://sailboatdata.com/sailboat/twister-28

https://sailboatdata.com/sailboat/j30

Well, looking at numerous threads on this site about "bluewater boats", you will see that plenty of people consider 2.00 to be some kind of magical cutoff. And considering your examples, it appears that the J30 has a capsize ratio of 2.34, but two J30's weathered the Fastnet storm without any problems.

[Adelie]

Originally Posted by sandy stone

Well, looking at numerous threads on this site about "bluewater boats", you will see that plenty of people consider 2.00 to be some kind of magical cutoff. And considering your examples, it appears that the J30 has a capsize ratio of 2.34, but two J30's weathered the Fastnet storm without any problems.

Given that the J/30 was first built in 1979, the year of the Fastnet storm, I’m dubious.

[Chris31415]

Originally Posted by sandy stone

And considering your examples, it appears that the J30 has a capsize ratio of 2.34, but two J30's weathered the Fastnet storm without any problems.

“The story of 2 J/30’s caught in the middle of yachting’s worst disaster”

https://jboats.com/j30/j30-sailing-fastnet-storm/amp

The Wallace J/30 is also mentioned in Rousmaniere’s book on the Fastnet race.

[Adelie]

I stand corrected.
Cool story.

[Don C L]

Of course we are talking about boats caught broadside to waves. After checking the article it looks like they did get caught by one wave and then ran under bare poles keeping the seas off their quarter.

I have one of those narrow, low freeboard boats that should resist capsize well, and IF capsized will recover quickly, but as Knotical points out, it does come with a hull that prefers to sail on her ear a bit (though 25 degrees means she's overpowered in my case anyway.) It does seem odd, until you think about it, but a hull that likes to roll, as long as it has a low center of gravity, will not like to capsize.

[Mike OReilly]

Originally Posted by Don C L

I have one of those narrow, low freeboard boats that should resist capsize well, and IF capsized will recover quickly, but as Knotical points out, it does come with a hull that prefers to sail on her ear a bit (though 25 degrees means she's overpowered in my case anyway.) It does seem odd, until you think about it, but a hull that likes to roll, as long as it has a low center of gravity, will not like to capsize.

Our boats are very similar, with nearly identical Capsize Ratio numbers (1.6). Mine is a bit longer and beamier (36' 9" LOA, 12' beam vs 28.50' LOA, 8' beam ). We sail our boat mostly at less than 8º-10º of heel. If we hit 12º then we're doing something wrong.

Maybe it's the additional beam?