6 March 2024 The free surface effect saves the life of a young sailor
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- เผยแพร่เมื่อ 7 ก.พ. 2025
- This TH-cam channel is about me an 84 and 5/6 year old dyslectic solo sailor building a 20 feet oceanic canoe for a long high latitude cruise.
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Time is passing, every day is another day. Resonated with me. Wishing you all the very best sir. I love learning from you. Thank you.
Sven makes every word count... I am trying to practice that more, but I am not too good at it. See? I should have stopped at the first five words.
I like these types of videos! Thank You, Captain Sven 💙
Thank you Sven,
for shedding some light,
on the •importance• of a boat,
that will 🔃SELF-RIGHT🔃
🙏🦉
🌊⛵🌊
It is a very important rule that Sven tell us, the boat must come back if it turn upside down on the sea.
Sven is the captain of the deep sea, all my respect to him ❤⚓️.
Hello Sven. Re: my Havsfidra 20... I so respect your accomplishments, and knowledge very much. I am 75 years old and just this year purchased a Swedish Havsfidra Fisksatra 6m double ender full keel sloop built in 1973. I believe there are only four of five in the USA and this may be only one on the West coast. I am presently beginning to restore "Pippi" to a safe level of completion so I may cross a couple of oceans before I check out of this world. I presently live aboard my 47' sloop but prefer the Havsfidra for my blue water adventures. I must say, you are a great inspiration for an old guy like me. I see you working hard, and it keeps me pushing on too! If you have a few minutes, I would appreciate so much your opinion on the Havsfidra, as they seem to be all over the world, and a lot in the Baltic, but maybe only two or three here in the USA. And I believe mine is the only one on the West Coast... I can't wait to get to sea in her.
Thank. you so much Sven for all that you do keeping us going...and good luck to you! ~ Martin
Didn't a Danish guy sail one of these round the world?
It may have been the same boat with a different name from a different builder.
There will be a lot on Havsfidras in the end of April -May
I owned the Havsfidra nr 666. Said to be one of the last ones from Fisksätra shipyard.
de SA3BOW
@@cornishhh My understanding and research shows there have been more than a few Havsfidras that have circumnavigated. But my favorite story is the tiny Havsfidra coming in third in class at the 1968 singlehanded OSTAR race across the Atlantic. In which she made the passage in 55 days, (the same time Sir Frances Chichester took in his big boat). Eric Taberly in Pen Duick IV had to withdraw due to damage, all the while the little Havsfidra plodded along to 3rd place. Sven is so right when he says a well founded small boat has a much better chance in many situations.... My 47 foot sloop will stay at the dock. I will be sailing "Pippi"... 🙂
@@drontobil
It must have been a very late one as they built less than 400 Havsfidras.
May be interesting to you Sven!
The other boat was called the "Herald of Free Enterprise", It was a Towsend Thoreson ferry that sailed Dover to Zeebrugge and I still have a magazine from my youth with a picture of it adorning the front cover, as I used to travel to France on the ferries a lot in my childhood! I think it killed close to 200 people and only a few people survived, despite it only just leaving port. The reason it capsized was indeed down to the surface free effect. They used to sail away with the doors still open to save time and on this occassion the ferry was loaded irregularly and dipped her bow into the water. The resulting water flooded the lower decks and sloshed about resulting in a capsize.
I had sailed on her sister ships, the "Pride and the spirit of free enterprise" on their Dover-Calais routes many times and the whole thing scared the living daylights out of me as a child.
Intererestingly years later I had sailed on the Greek Ferry "Samina" to Paros a few times over a period of going there on holiday with friends and on this occassion in 2000 I had sailed back to the mainland alone on a different ferry due to work committments. My friends were due to sail on the Samina back a few days later. However they got stuck in Paros as the ship had sunk on its way to them.
The ship was apparently on autopilot with no-one on watch and it crashed into rocks soth of Anti-Paros.
Both terrible disasters that could have easily been averted.
A few weeks later the small ferry from Paros to Naxos also sunk. Another boat I had previously sailed on twice! Noone was killed on that one fortunately.
Thanks
I remember it well
👍
Maybe sealing the mast and adding a flotation device to top of the mast could help prevent turtling.
It is no problem with my slender boats
As Sven explained, a capsized broad beam boat may not right itself due to its form stability. However, the sloshing of water back and forth inside the boat eventually returns Alain's boat to the upright position. Small and huge ships install baffles in water and fuel tanks and try to keep them topped up or empty to prevent excessive stability problems from the fluid in them.
Note: it occur when an inner volume, for example a ships hold, is not full. This also applies for fish cargo in fishing boat holds.
It acts like a "slow" fluid.
de SA3BOW
@@drontobil True, something commercial fishing vessels are well aware of. Cheers.
@@CptnbondFrom my youth I remember a fatal event with a, then, small wooden coastal trawler with partial loaded hold meeting inclement weather.
The seas have been hard on fishermen. I could rant a long time about how coastal fishermen have been badly treated and even scorned.
de SA3BOW
Most boats, from a humble rowboat to an aircraft carrier, have a center of gravity (CG) that is above the center of buoyancy (CB).
As the boat leans over, due to an outside force, the CB shifts over to the low side. The CG also shifts over to the low side but not as far as the CB does. When this happens, the boat rights itself.
It is when the CG shifts further to the low side than the CB does that the boat capsizes.
What happens with free surface effect is that the water inside the boat shifts to the low side. This effectively moves the CG further to the low side than it would otherwise go. If there is enough of it, and if it moves far enough to the low side, the CG will move further to the low side than the CB will. When this happens, the boat will capsize.
This is as true if the boat is floating upside down as it is if the boat is floating upside down if the CG is above the CB when the boat is floating upside down.
For short fat sailboats like my Halman 20 i've wondered if adding floatation/foam to the cabin roof would help the boat recover from going turtle?
I have been thinking about buying a Halman 20 that is near to me. Any regrets with your boat? Are you in fresh or saltwater?