Sailboat capsize screening formula
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- čas přidán 26. 08. 2024
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I’m Military instructor… and repeating is key… say it as many times as you feel it needs to be said… I know what your are trying to say!
Love your videos and how you teach each one of us, keep it up!
Yup, we had those. Had the regular darts too. When I was about 6, stuck my father right in the back. My aim at 6 was obviously bad. lol. He just looked at me laughing, said pull it out.
Thank you for explaining. I was wondering the same thing
Definitely appreciate that you provided a recommendation for a more realistic calculation for the CSF. So, I’ll own the fact that I thought it was a valid metric. Glad I watched the video. Hopefully Sailboat data can provide updated data and give a more accurate picture of a vessel’s capabilities and limitations. Thanks for the vid
All good my man, a lot of people think it is a valid number, its just unfortunately not
Great explanation. Thank you!
Thanks so much for doing this video. I knew before watching that the Capsize Screening Formula ( CSF) was basically to be used only as a guide and in fact was often very misleading for a given boat. Information one the STIX is very interesting. I will check it out more but sounds like you can't find nor calculate it easily. #1 rating on this video
This was a great informative video thank you for this information
Soo cool thx!
Could you do the same for comfort ratio?
lol i just sent you an email 5 min before I saw this video, asking about this haha
Thank you for explaining this
Thanks for putting out these videos. I find them very educational. Would love it if you could put together a talk on sailboat insurance. Stuff like any requirements companies might put on you - living aboard\seasonal use, what sailing experience they ask for, liability only versus full coverage, travelling to other countries, hurracane area restrictions, better to register and get insurance in US versus Canada, a Caribbeanisland etc.
Also what common insurance requirements do marinas have? Different in different countries\locals or similiar everywhere?
@@danmergl9197 thank you for watching, most Marina require liability for the minimum
Dude remember clackers? 2 Balls of hard acrylic attached to each other by a string and you would sling them up and down into each other and once you got them going fast enough and hard enough they would explode sending shards every where! Oh man those where the days fun had by all.
62 years old and I remember them well!😂 we also called the ka-nockers!
My boat is a 2.68 and shes fast, fun, and somewhat comfy lmao
Thanks again Chris
Any time!
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You have no idea the amount of information you really need
... nor misinformation you should avoid
I'd imagine in bad weather you are not going to right a sailboat if it capsizes, but I know nothing about sailboats. I'd also imagine you have been out in some horrendous weather with ocean crossings and over 200k miles put in and you're still with us. I've been on the water since I was in diapers. Our first boat was wooden 17 ft, then another 17 fg boat, dads last one was a 19ft grady white. By the time I was 10 I could drive the boat better than him. We had some really bad days out there, I drove dad hooked the pots.
We had lobster pots in Plymouth MA, had to drive 6 miles to get to where we put them in, with that small of boat it got messy out there real quickly. Also had a 21 ft boat in Florida for 15 years. Had some oh shit nights and I was out in some storms that I wasn't ready for in the 90's. How is a sailboat compared to a small boat in bad weather? I would think it would be worse.
Please tell me your thoughts on the freedom 40/40
What of the comfort ratio?
Yes, CSF is a misleading number, but so is the SSV (Screening Stability Value), which is used to calculate the AVS (Angle of Vanishing Stability). Why? Because the SSV depends on using Ballast Ratio in its calculation and, just like your complaint about using weight to calculate the CSF, Ballast Ratio simply talks about relative amounts of weight and not where the weight is distributed. It is possible for two boats with similar hulls and ballast ratios to have completely different centres of gravity and stability curves, depending on just where they hold their ballast weight.
Unfortunately, owners and race committees needed fairly simple and straight-forward formulas to assess the suitability of boats for various racing conditions. The usage of Ballast Ratio, CSF and SSV became accepted because they were relatively easy to compute without sophisticated measurements and computerized stability programs. Then the boat reviewers and boat brokers latched onto them as an easy justification for comparisons and pronouncements, even if they are misleading. To quote Mark Twain: "There are lies, damned lies, and then there are statistics."
Love the aerials... do them yourself?
You mean at 12.58 ",,,, and you can come to the same conclusions.... experienced sailor have COME to....".
Can you please also explain LWL and how you say it gives more livable space. I was under the impression that LWL makes your boat go faster and good for speed and stability but don’t really understand the livable space part. I thought this was related LOA, beam and how it’s designed. I agree higher is better and closer to LOA is better but always thought it was for speed and sailing efficiency not livable space. Thanks
Length at the Waterline extends up through the inside of the boat to the deck. Every bit of the boat's waterline has boat on top of it. With length on the deck, that isn't always the case. You can be standing at the bow and there's no boat under the deck you're standing on because the deck overhangs the boat. So if you have two 30 foot LOA boats and one has a 28 ft LWL and the other is 23, the first one has 5 more feet of boat interior for designers to add to their salons or bedrooms or to stick heads in.
@@2ndPrize that makes sense and thank you for the explanation. I feel silly now and just a newb trying to understand.
@@mvakleko there are no dumb questions my man
@@mvakleko I once asked if a keel stepped mast had to be situated over the keel. Nope, it's just stepped to the bottom of the boat. No need to feel silly about trying to understand something.
ok, so how does the beam affect stability & ability to right the boat after capsize? is wider or nerrower bettter & how about the displacemnt ?
The capsize numbers are irrelevant, what matters is the boat’s seaworthiness, the experience of the crew and Common Sense.
Essentially this value has 0 meaning unless you’re comparing two similarly designed boats ie. Same hull shape, keel design and rigging design. If it doesn’t take into account the CG, it really means absolutely nothing when it comes to capsizing or righting ability. According to this formula, the “safest” boat would be a channel marker. 🤣
The AVS is far more useful, but in reality, if you’re looking for a way to determine likelihood of capsizing you might as well throw a dart at a board because it depends on so many things, many of which are not within the boat designs control such as wind itself, water current, angle of attack, sail trim, gear weight, placement and security, fill level of water and fuel tanks etc.
Ultimately it is very simple: the CE rating tells you that the sailboat was designed properly. Sailing is funny that way. When an aircraft is certified, it means that competent authorities have looked at how it was designed, reviewed the testing over thousands of hours, etc. Is there anyone that will want to compute a safety factor on different aircraft types to decide what you will accept to fly in? Of course not. Why? Because nobody is competent enough to do that. Why people think they are able to assess the value of sailboat designs is beyond me. Sailboat manufacturers employ aerodynamics, marine engineers, etc. Very few people understand technology enough to question the safety of sailboats. Same logic applies to cars and any high-technology product. It’s not like you have thousands of stories of people dying on a Beneteau every year. So people need to stop thinking they are competent enough to weigh in on these issues…they are not. Just sail, become the best sailor you can, and chances are you won’t sink. Don’t worry about the boat. If it was certified, it’s good enough.
Agree 100%
"Alcoholism" doesn't mean anything.
Words on shirt
Context over Content
If you stop talking so much about nothing it my make these bearable to watch
I think you confused me with someone who cares if you watch, why would you possibly think I care at all if you watch?
Essentially this value has 0 meaning unless you’re comparing two similarly designed boats ie. Same hull shape, keel design and rigging design. If it doesn’t take into account the CG, it really means absolutely nothing when it comes to capsizing or righting ability. According to this formula, the “safest” boat would be a channel marker. 🤣
The AVS is far more useful, but in reality, if you’re looking for a way to determine likelihood of capsizing you might as well throw a dart at a board because it depends on so many things, many of which are not within the boat designs control such as wind itself, water current, angle of attack, sail trim, gear weight, placement and security, fill level of water and fuel tanks etc.