Hello Oscar! That's my Grandfather's name. Captain Sven, another favorite type of video, teaching, show, and tell! Of course, all your videos are WATCH and LEARN!! ✝️🙏❤️🇺🇸🇸🇪⛵️🇬🇧🍍😊
Nice practical demonstration. But the sails, if the boat flips 180°, they will act as a keel or stabilising force? You probably have the sheets inside the boat so you can release them and thereby reduce the force Or will the masts fall out of their holders? Anyway, just a few thoughts and a comment for the algorithm to chew on.
This is just a non scale muckup The ballast ratio is much higher than on a cruising boat. Still it do not selfrigth My boats have capsized with sails in the Roaring Forties with sails up I speak from experience. I have also tested them in harbour as you can see in my videos.
Sven, this is not entirely fair of you, ball and square, no ballest in either "boat" is needed to show us what happens. The shape turns the ball as you want, but the block always stands on the flat edge, maybe just as well straight up on the edge. hehe But still the principle is completely correct. The example where the boat filled with sea is an example of the buoyant force decreasing, which also decreased the width of the float inside so the waves could turn more easily and thus moved the CG lower. But of course you know this just as well. Wish you good health.
Typically, this statement is correct. It can be misleading, however. What matters when it comes to range of stability, are three factors: 1.) Average beam. That is what the beam of the boat averages out to be. Divide the hull lengthwise into eight or more equal segments, then measure beam of each. Total all of these up the divide by the number of segments. The product of this is your average beam. A wide boat can well end up with a smaller average beam than a narrower one. 2.) The tallness of the largest enclosed volume section divided by the average beam. If that number comes out to be less than 0.5, there is likely to be problems that can only be solved by deep and heavy ballast. 3.).the immersed volume of the boat compared to its average beam. The greater this is, the easier it is to get a wide range of stability without a huge amount of ballast. Since narrow boats tend to do well in all of these three factors, they do tend to have better ranges of stability than wider ones. However, it is very possible to design a narrow boat with a low range of stability and a wide boat with a high one. For example, one of my "around-in-ten" design concepts has a beam of 1.37 m and a length of 3.05m, but has an excellent range of stability. In fact, it probably would not float upside down at all if it's stores and equipment is well secured.
What is the definition of tallness in (2). If I assume it's the cabin (closed), is it the height above the waterline or from the bottom of the canoe and to the rooftop of the cabin...?
@@Cptnbond By "tallness" I mean from the very bottom of the hull to the very top of the cabin, providing the cabin can withstand the pressure of the sea if the boat is upside down.
Hello Oscar! That's my Grandfather's name. Captain Sven, another favorite type of video, teaching, show, and tell! Of course, all your videos are WATCH and LEARN!! ✝️🙏❤️🇺🇸🇸🇪⛵️🇬🇧🍍😊
😁👍
Thank you for today's video Sven and Oskar.
Those ocean racing designs, now on trend called spoons having shallow freeboard and wide transoms. We can see are very stable when inverted.
Nice practical demonstration. But the sails, if the boat flips 180°, they will act as a keel or stabilising force? You probably have the sheets inside the boat so you can release them and thereby reduce the force Or will the masts fall out of their holders? Anyway, just a few thoughts and a comment for the algorithm to chew on.
sails will likely be reduced or furled in conditions that could produce capsize. good day
@@ryder6070 True, but then you have Murphy's law. Capsizing does not happen when you expect it to.
This is just a non scale muckup
The ballast ratio is much higher than on a cruising boat.
Still it do not selfrigth
My boats have capsized with sails in the Roaring Forties with sails up I speak from experience.
I have also tested them in harbour as you can see in my videos.
Sven, this is not entirely fair of you, ball and square, no ballest in either "boat" is needed to show us what happens. The shape turns the ball as you want, but the block always stands on the flat edge, maybe just as well straight up on the edge. hehe But still the principle is completely correct. The example where the boat filled with sea is an example of the buoyant force decreasing, which also decreased the width of the float inside so the waves could turn more easily and thus moved the CG lower. But of course you know this just as well. Wish you good health.
The square one have a high ballast ratio in the form of the screws
Typically, this statement is correct. It can be misleading, however.
What matters when it comes to range of stability, are three factors:
1.) Average beam. That is what the beam of the boat averages out to be. Divide the hull lengthwise into eight or more equal segments, then measure beam of each.
Total all of these up the divide by the number of segments. The product of this is your average beam.
A wide boat can well end up with a smaller average beam than a narrower one.
2.) The tallness of the largest enclosed volume section divided by the average beam. If that number comes out to be less than 0.5, there is likely to be problems that can only be solved by deep and heavy ballast.
3.).the immersed volume of the boat compared to its average beam. The greater this is, the easier it is to get a wide range of stability without a huge amount of ballast.
Since narrow boats tend to do well in all of these three factors, they do tend to have better ranges of stability than wider ones.
However, it is very possible to design a narrow boat with a low range of stability and a wide boat with a high one.
For example, one of my "around-in-ten" design concepts has a beam of 1.37 m and a length of 3.05m, but has an excellent range of stability. In fact, it probably would not float upside down at all if it's stores and equipment is well secured.
What is the definition of tallness in (2). If I assume it's the cabin (closed), is it the height above the waterline or from the bottom of the canoe and to the rooftop of the cabin...?
What is your "around-in-ten" design goal? I am guessing around the world in ten months?
@@Cptnbond
By "tallness" I mean from the very bottom of the hull to the very top of the cabin, providing the cabin can withstand the pressure of the sea if the boat is upside down.
@@williamgrebenik8876
The goal of an "around-in-ten" is to sail around the world in a boat that is ten feet long.
@@williamgrebenik8876Then moths is very fast
A small boat will take much longer