Rappey
Well-Known Member
A much speeded up video of up to 5 cruise ships moving within the port at once and not a tug boat to be seen.
Miami cruise ship choreography.
- Thread starter Rappey
- Start date
stuartwineberg
Well-Known Member
Decent cross wind blowing as well
veshengro
Well-Known Member
Swivelling propeller pods and bow thrusters. Amusing to see them leaving the Quayside going sideways like Crabs...Good video. 
ashtead
Well-Known Member
I’ve seen a few saga type ships in the river dart and while much smaller quite interesting. I guess not much fog in Miami which tends to catch out the ferries I’ve read.
Stemar
Well-Known Member
A couple of them must have needed a XxXL shoehorn to fit!
I wish I could go sideways like that on Jazzcat - it'd be really handy coming into an uptide pontoon.
I wish I could go sideways like that on Jazzcat - it'd be really handy coming into an uptide pontoon.
dunedin
Well-Known Member
What a mass cattle trade that looks like!
With 5 huge ships moving at the same in the same small space (as mid way through), and all the rapid U turns in tiny spaces, what will be the outcome WHEN it goes wrong? It isn’t a matter if IF, as there is always room for human error - and seems to be ships are not immune from control systems failures which can cause havoc.
The container ship taking out a bridge was extremely lucky in terms of so few fatal casualties (tragic though they were for the innocent repair crew). Might not be so lucky if a could have these beasts get it wrong. Costa Concordia showed how little stability they have if the hull gets pierced.
With 5 huge ships moving at the same in the same small space (as mid way through), and all the rapid U turns in tiny spaces, what will be the outcome WHEN it goes wrong? It isn’t a matter if IF, as there is always room for human error - and seems to be ships are not immune from control systems failures which can cause havoc.
The container ship taking out a bridge was extremely lucky in terms of so few fatal casualties (tragic though they were for the innocent repair crew). Might not be so lucky if a could have these beasts get it wrong. Costa Concordia showed how little stability they have if the hull gets pierced.
RunAgroundHard
Well-Known Member
Great video and that functionality is now available in the leisure sector, for quite small vessels, but at a price.
Likely the cruise liners will have DP3 capability, which means that there is redundancy in the thrusters and power supply to them. The engines will be segregated, likely 4 engine rooms, 2 engines per room, fire and flood isolation from other bays. Each engine room will feed to a single bus system, with 4 x bus ties between each room. They will operate on closed bus, meaning all engines are powering an integrated bus as if there was only one bus system. It can also operate with each bus isolated but that burns more fuel. In the event of a power issue, the bus breakers will open on the engine bay that is at fault, or all will open. Power from 11 kva is transformed to 600v at each thruster and all can be controlled from any bus configuration. The positioning has multiple layers of redundancy, 3 DGPS, 3 x inertial gyro compasses and a pile of motion sensors all over the vessel. The cruise ships may also have an independent system in the port through laser or acoustics that defines location to a fixed or multiple fixed points.
Basically, it takes a lot of outage for these ships not to know where they are, and how to react. For the environmental conditions stated in the marine manual, current and wind speed, the thrusters will also have redundancy. The engines and generators all feed into a management system that optimizes thrust and power delivery, even in fault mode. Uptime is measured in excess of 10ths of 99%.
It does go wrong when electricians don’t understand fault modes and keep pressing reset and huge spikes start cycling around the bus causing everything to trip. The normal protocol for uncertainty is to open all the bus breakers and run each engine bay and assigned thruster set independently. However, almost 10 years of operating 4 drill ships in DP3 mode 24/7 with only one outage, caused by human failure to RTFM,
Likely the cruise liners will have DP3 capability, which means that there is redundancy in the thrusters and power supply to them. The engines will be segregated, likely 4 engine rooms, 2 engines per room, fire and flood isolation from other bays. Each engine room will feed to a single bus system, with 4 x bus ties between each room. They will operate on closed bus, meaning all engines are powering an integrated bus as if there was only one bus system. It can also operate with each bus isolated but that burns more fuel. In the event of a power issue, the bus breakers will open on the engine bay that is at fault, or all will open. Power from 11 kva is transformed to 600v at each thruster and all can be controlled from any bus configuration. The positioning has multiple layers of redundancy, 3 DGPS, 3 x inertial gyro compasses and a pile of motion sensors all over the vessel. The cruise ships may also have an independent system in the port through laser or acoustics that defines location to a fixed or multiple fixed points.
Basically, it takes a lot of outage for these ships not to know where they are, and how to react. For the environmental conditions stated in the marine manual, current and wind speed, the thrusters will also have redundancy. The engines and generators all feed into a management system that optimizes thrust and power delivery, even in fault mode. Uptime is measured in excess of 10ths of 99%.
It does go wrong when electricians don’t understand fault modes and keep pressing reset and huge spikes start cycling around the bus causing everything to trip. The normal protocol for uncertainty is to open all the bus breakers and run each engine bay and assigned thruster set independently. However, almost 10 years of operating 4 drill ships in DP3 mode 24/7 with only one outage, caused by human failure to RTFM,
Rappey
Well-Known Member
Next we have the ships horns. Makes the 1 to 5 blasts very yesterday ?
Pump-Out
Well-Known Member
All that and not a single tug.
Impressive ship handling from all concerned.
Impressive ship handling from all concerned.
