Do we have a catamaran stability video? There are a good number of catamaran flipping over on Australian water and I would be very interested to have some of the advice before my decision to go with catamaran or mono boat. Thank.
How Did you get into the ship design Industry? I have a huge interest in the designing field, especially in ships! What sort of qualifications do you require from University...? and is it an enjoyable job for you..? Great videos, thanks
Ship design is viewed mostly as an engineering job. It began with a university degree. The name of the degree changes, depending on the university. "Naval Architecture", "Marine Engineering", and "Ship Science" are the most common titles. From there, I applied to various engineering firms and got my first job. The balance between engineering and design changes, depending on your job. Many of us started our degrees planning to become yacht designers. And then we discovered that commercial vessel design was more complicated and interesting. To learn more, you can look at some professional societies for ship designers. Two that I recommend: SNAME , and RINA Good luck.
Can You suggest what age is to old to do second (or third) faculty in naval architecture / ocean engineering? When it's time to stay as amateur building plywood dinghies, and when it's still time to go for engineering?
heel != roll. heel is a fairly constant tilt due to fairly constant forces, ie when sailing. roll is cyclic in both directions, ie rocking in the waves.
What do you have to add on to small sailboats to help stabilize underway & at anchor . Is the motion comfort calculator really accurate ? Do bilge keel boats have more motion comfort ?
Comfort on small sailboats is always a challenge because the boat gets smaller, and the waves stay the same size. Broadly speaking, bilge keel boats do add more to motion comfort. But they can only do so much. For a small boat, active control systems like a Seakeeper gyro are usually more effective (but expensive).
Hi Nicholas. I am enjoying watching your videos. I would be really interested in seeing you crunch and explain the maths of stability under extreme conditions of one of the mega cruise ships with very high superstructures like, the Symphony of the Seas, Oasis of the seas, Anthem of the Seas, Norwegian Joy etc. Extreme simultaneous conditions like: 100+ mile an hour winds, 40+ ft waves, a zero propulsion (For example: caused by a fire) and then add a list due to flooding caused by a collision.
not sure why I keep thinking of that ERRV channel (Bigwavemaster1) as you describe the rolling and stuff. Hopefully, no one thinks they are invincible and force emergency responders to risk their lives over someone's bad choices. The best "ExtremeStability" ye can have, is just not going where you need it.
Hard to say. To use an analogy, vessel stability is like designing a racecar. And the master of the vessel is the car driver. We only give them the tools, but they can get vastly different stability performance, depending on how they drive the car. But I can say that on a cruise ship, passenger comfort often limits the operations long before you reach the safety limits of the vessel.
This few views, we don't deserve such a wealth of information and production value for how little fame you have. Also, please tell mt your thoughts on Proas, and modern Proas!
I think the proa hullform has some potential for use on motor yachts. I'm not as about application to a sailing yacht. The sailing design needs to anticipate an unexpected jibe or tack. In the proa hullform, those could be very bad. Still, it has less surface area than a trimaran. I suspect the key is to design your ship so the center of gravity rests slight off center of the main hull. I'm still working on the proa as potential for a modern vessel. One of the backburner R&D projects.
Very relatable! If you click this link (my dead blog), then scroll down a bit, you'll see a picture of our heel indicator after a proper "Hooray and up she rises!" moment: oscilia.blogspot.com/2011/09/you-got-con-dude.html Later that year we hit a proper bad one that I didn't document in any way, but it was the sort of thing that had me standing on the bulkheads while she took those dreadful pauses before coming back up, deck submerged to the coamings, leaving me convinced that I would have been stuffed into the bilges by an omnipotent wall of water if it wasn't for the contingency planning that went into her design.
You failed to highlight the fact that Powerful waves can break a ships back ... and in some cases if wrong metal is used the ship will break apart ... ,,, 2 most famous sinkings .. Edmund Fitzgerald all her crew went down with her ..and The Derbyshire broke apart due to the rivets reacting to cold water temps which caused the stern to snap off from the rest and the crew had no chance of survival
Excellent examples! I still need to do a video about some of the more famous tragedies. In fact, most of our major codes on ship safety were inspired by a famous disaster. You can look back through history and see the regulatory reaction to major tragedies.
The Derbyshire was riveted? Did she not founder as a result of the forecastle compartment flooding in foul weather due to a deck hatch being poorly dogged and then torn off.
sixmagpies yes she was there is a documentry which showed the cause as the cause was found by sheer luck when one of the sister ships was in drydock in holland
Not wishing to be too pedantic, but one cannot agree that any of the six Bridge Class were riveted. She was built at SwanHunter in 1975, and long after riveting had ceased. To quote the accident report made after the underwater survey "Ultimately it was determined that waves crashing over the front of the ship had sheared off the covers of small ventilation pipes near the bow. Over the next 30+ hours, seawater had entered through the exposed pipes into the forward section of the ship, causing the bow to slowly ride lower and lower in the water. Eventually, the bow was completely exposed to the full force of the rough waves which caused the massive hatch on the first cargo hold to buckle inward allowing hundreds of tons of water to enter in moments. As the ship started to sink, the second, then third hatches also failed, dragging the ship underwater. As the ship sank, the water pressure caused the ship to be twisted and torn apart by implosion."
Do we have a catamaran stability video? There are a good number of catamaran flipping over on Australian water and I would be very interested to have some of the advice before my decision to go with catamaran or mono boat. Thank.
Have you done a video on so-called super or mega yachts, and what sort of bad weather they can tolerate or not, :)
No yet. But that's a good one. I'll add it to the list. Thanks!
How Did you get into the ship design Industry? I have a huge interest in the designing field, especially in ships! What sort of qualifications do you require from University...? and is it an enjoyable job for you..?
Great videos, thanks
Ship design is viewed mostly as an engineering job. It began with a university degree. The name of the degree changes, depending on the university. "Naval Architecture", "Marine Engineering", and "Ship Science" are the most common titles. From there, I applied to various engineering firms and got my first job. The balance between engineering and design changes, depending on your job. Many of us started our degrees planning to become yacht designers. And then we discovered that commercial vessel design was more complicated and interesting. To learn more, you can look at some professional societies for ship designers. Two that I recommend: SNAME , and RINA Good luck.
Nicholas Naval Architect Thanks so much man!
Can You suggest what age is to old to do second (or third) faculty in naval architecture / ocean engineering?
When it's time to stay as amateur building plywood dinghies, and when it's still time to go for engineering?
Brilliant final comment.
Enjoyed watching. You have made a complicated topic interesting. Thanks!
Your explaination in this vidio is very usefull for aswering my questions inside my brain.Well, i'am very thankfull dude.
I would love to hear a discussion of the stability of the (in)famous turn-of-the-century Russian Circular Battleships...
When he asks imagine how you would feel when the deck heels in a 50 degree roll. I don't have to. Been there, done that!
I do it all the time. I sail...
Still 50º is downright scary on a ship!
heel != roll. heel is a fairly constant tilt due to fairly constant forces, ie when sailing. roll is cyclic in both directions, ie rocking in the waves.
Been there, done that, got the life jacket... :-D
What do you have to add on to small sailboats to help stabilize underway & at anchor . Is the motion comfort calculator really accurate ? Do bilge keel boats have more motion comfort ?
Comfort on small sailboats is always a challenge because the boat gets smaller, and the waves stay the same size. Broadly speaking, bilge keel boats do add more to motion comfort. But they can only do so much. For a small boat, active control systems like a Seakeeper gyro are usually more effective (but expensive).
Extreme roll . . . when I love being a landlubber.
Hi Nicholas. I am enjoying watching your videos. I would be really interested in seeing you crunch and explain the maths of stability under extreme conditions of one of the mega cruise ships with very high superstructures like, the Symphony of the Seas, Oasis of the seas, Anthem of the Seas, Norwegian Joy etc. Extreme simultaneous conditions like: 100+ mile an hour winds, 40+ ft waves, a zero propulsion (For example: caused by a fire) and then add a list due to flooding caused by a collision.
Great idea! I'll add it to the list of videos.
@@DatawaveMarineSolutions And then there was the Viking Sky. Two years after your video.
Did you receive my email about new hull suggestions, investigation, etc?
7:00 where do you get these videos from?
Rolling like that... Sounds like a double hull tanker in ballast in the Gulf of Alaska.
not sure why I keep thinking of that ERRV channel (Bigwavemaster1) as you describe the rolling and stuff. Hopefully, no one thinks they are invincible and force emergency responders to risk their lives over someone's bad choices. The best "ExtremeStability" ye can have, is just not going where you need it.
Absolutely agree.
Do you think anthem of the seas was pushed close to its limits in 2016
Hard to say. To use an analogy, vessel stability is like designing a racecar. And the master of the vessel is the car driver. We only give them the tools, but they can get vastly different stability performance, depending on how they drive the car. But I can say that on a cruise ship, passenger comfort often limits the operations long before you reach the safety limits of the vessel.
This few views, we don't deserve such a wealth of information and production value for how little fame you have. Also, please tell mt your thoughts on Proas, and modern Proas!
I think the proa hullform has some potential for use on motor yachts. I'm not as about application to a sailing yacht. The sailing design needs to anticipate an unexpected jibe or tack. In the proa hullform, those could be very bad. Still, it has less surface area than a trimaran. I suspect the key is to design your ship so the center of gravity rests slight off center of the main hull. I'm still working on the proa as potential for a modern vessel. One of the backburner R&D projects.
Very relatable! If you click this link (my dead blog), then scroll down a bit, you'll see a picture of our heel indicator after a proper "Hooray and up she rises!" moment: oscilia.blogspot.com/2011/09/you-got-con-dude.html Later that year we hit a proper bad one that I didn't document in any way, but it was the sort of thing that had me standing on the bulkheads while she took those dreadful pauses before coming back up, deck submerged to the coamings, leaving me convinced that I would have been stuffed into the bilges by an omnipotent wall of water if it wasn't for the contingency planning that went into her design.
感谢你的科普，
Surfing rouge wave=stability test.
You failed to highlight the fact that Powerful waves can break a ships back ... and in some cases if wrong metal is used the ship will break apart ... ,,, 2 most famous sinkings .. Edmund Fitzgerald all her crew went down with her ..and The Derbyshire broke apart due to the rivets reacting to cold water temps which caused the stern to snap off from the rest and the crew had no chance of survival
Excellent examples! I still need to do a video about some of the more famous tragedies. In fact, most of our major codes on ship safety were inspired by a famous disaster. You can look back through history and see the regulatory reaction to major tragedies.
The Derbyshire was riveted? Did she not founder as a result of the forecastle compartment flooding in foul weather due to a deck hatch being poorly dogged and then torn off.
sixmagpies yes she was there is a documentry which showed the cause as the cause was found by sheer luck when one of the sister ships was in drydock in holland
Not wishing to be too pedantic, but one cannot agree that any of the six Bridge Class were riveted. She was built at SwanHunter in 1975, and long after riveting had ceased. To quote the accident report made after the underwater survey "Ultimately it was determined that waves crashing over the front of the ship had sheared off the covers of small ventilation pipes near the bow. Over the next 30+ hours, seawater had entered through the exposed pipes into the forward section of the ship, causing the bow to slowly ride lower and lower in the water. Eventually, the bow was completely exposed to the full force of the rough waves which caused the massive hatch on the first cargo hold to buckle inward allowing hundreds of tons of water to enter in moments. As the ship started to sink, the second, then third hatches also failed, dragging the ship underwater. As the ship sank, the water pressure caused the ship to be twisted and torn apart by implosion."
sixmagpies are u called the dutch experts liars in there findings . When it was clearly stated in the documentry which i watched on this very site
You forgot to say Yarrrrrgh!
Me to
PUuuuuuuke