Mexican ship vs. Brooklyn Bridge

Gilligan

#*! boat!
PREMO Member

Gilligan

#*! boat!
PREMO Member
The reporting on this is disgustingly ill-informed. But I shouldn't be surprised.

1. You only go to high reverse power levels when handling a ship like this, when you want to slow or stop forward movement. You might also briefly go to a higher reverse power level when you want to shift the stern port or starboard (you only get one of those choices with a single screw).
2. You never back down continuously in reverse with a ship like that; you have little to no steerage in reverse.
3. That vessel was obviously in full reverse power when it hit the bridge and continued in full reverse power well after the demasting and clearing of the bridge structure.

It was a loss of propulsion control.
 

GURPS

INGSOC
PREMO Member
The reporting on this is disgustingly ill-informed. But I shouldn't be surprised.

1. You only go to high reverse power levels when handling a ship like this, when you want to slow or stop forward movement. You might also briefly go to a higher reverse power level when you want to shift the stern port or starboard (you only get one of those choices with a single screw).
2. You never back down continuously in reverse with a ship like that; you have little to no steerage in reverse.
3. That vessel was obviously in full reverse power when it hit the bridge and continued in full reverse power well after the demasting and clearing of the bridge structure.

It was a loss of propulsion control.
Or the Captain panicked and went full send mode.




Sal explains exactly what happened .... basically backing out of a parking space





 

Gilligan

#*! boat!
PREMO Member
Or the Captain panicked and went full send mode.
That's still a loss of propulsion control event. I was on a 50-knot 350-passenger ferry that crashed a landing in Norway (in full view of TV cameras) because the captain asked the propulsion control system to quickly do something it was not capable of doing.

Most propulsion control systems like what would probably have been on that Mexican tall ship's auxiliary power diesel have a "feature" that requires the engine RPM to drop below a certain threshold before the shift command is acted on. It would not be the first time that a "panic" situation resulted in the failure of transmission to shift from forward to reverse (or opposite) but let the engine RPM increase anyway. The most modern propulsion control systems (that we deal with) have more sophisticated control software to prevent that but nothing is ever 100%.
 

Gilligan

#*! boat!
PREMO Member
Why the Donald Ducks, if one is going to throw stones wasn't there a harbor master aboard?
How would having a Harbor Master or pilot on board have any effect on a propulsion control failure?

I've seen a couple discussions or reports regarding the tug assist and whether they'd dropped off prematurely as the sailing ship was maneuvering to get underway. Lots of armchair ship handling experts involved in most off what I've seen reported so far....
 
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WingsOfGold

Well-Known Member
How would having a Harbor Master or pilot on board have any effect on a propulsion control failure?

I've seen a couple discussions or reports regarding the tug assist and whether they'd dropped off prematurely as the sailing ship was maneuvering to get underway. Lots of armchair ship handling experts involved in most off what I've seen reported so far....
Nope, notta expert nor claim to be. Just speculating, it's Mehicho's problem. Hope they didn't scratch the bridge.
 

black dog

Free America
Mexicos Navy has failed, like their Space Shuttle Program.

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