Originally Posted by chucklesR
Do mono hulls show an absolute static stability measure to show what wind speed would be necessary to capsize it with only windage from mast and cabin?
And please, don't tell me it doesn't happen. I watch boats in the mooring field in front of my house heel over 30/40 degrees in gusts of only 40 kts. Add some wave action (say from your 80kt example above) and anyone can capsize.
No, on a class A boat no, not with wind alone. The boat goes to 90ļ/100ļ stay there till the blow passes and then comes over again.
Actually it happened to me with wind high over the charts. Some freak med phenomena. It was night I only see it coming on the radar. I don't know if it was a micro burst or a tornado. I let go the main on the 3th reef and even so the boat remained flat on the water for several minutes till the high winds passed away.
Whit a cat the same happens I mean capsize with the wind, the difference is that he will not come up again.
I am not saying that a Cat will go flat on the water with less wind than a monohull (it will depend on the cat and on the monohull). I am just saying that it will happen with a given wind intensity and that it would be pretty easy to determine that. It seems an important safety factor for a sailor to know that regarding his cat the same way that to know the boat's AVS is important to a monohull sailor.
To know what is the wind needed to capsize a cat without sails seems to me an important measure of the boat stability and one more important than a relative stability regarding stability/sail area. One can always reef or take the sails away.
I don't want with this to say that Cats are unsafe, just different.
There are however small light cats that will not have the stability (regarding the amount of wind they can take with bare poles before capsizing) to sail safely offshore. I am just saying that this would be the best way to access a Cat stability not that Cats bigger and heavier than a certain limit will not be safe offshore boats, quite the contrary.
The reserve stability on a monohull is accessed in a different way, trough a stability curve. Cats don't have reserve stability so its safety in what regards stability should be measured another way. I just pointed out the one that seemed better to me.
Maybe you have another suggestion?