Dear Sirs, I’m a Captain of Merchant Navy, and I’m doing a MsC about Emergency Anchoring. In order to give a better contribute to our area, I’d like to present some calculations, deploying how many knots can a ship loose after has dropped her anchor (per metres or per seconds) in an emergency. I …

Yes, he did. I made a mistake. I am sorry. However, is that really acceptable to have ships fitted with 11 or 12 shackles of cables that the crew should not use them all in shallower waters? We were not told about that limit. Should the crew be informed about this limitation if it is really the ca…

It is rather difficult to control a short stay run out of anchor cable in emergency. Free fall object will accelerated at a rate more than 9 meters per second. Through the windlass and the hawsepipe , anchor could still running out a few meters every second. We may need a speed over 8 or 10 knots (~…

[image] BruceChun: However, is that really acceptable to have ships fitted with 11 or 12 shackles of cables that the crew should not use them all in shallower waters? It’s it really acceptable to have a container ship with enough horsepower to go 24 kts if it can’t use full throttle in a con…

[image] BruceChun: An anchor will not generate the same amount of holding power when it was dragging. Its holding power is even less than those of a dragging chain. The 20mt mass in motion may provide a drag no more than 25 tonnes force with single anchor, 50 tonnes force with both anchors. It i…

[image] BruceChun: The 20mt mass in motion may provide a drag no more than 25 tonnes force with single anchor, 50 tonnes force with both anchors. It is no match to the momentum (100,000mt at 1m/s) of the ship even at very slow speed (2 knots). Nobody is claiming that dropping anchors is appli…

Anchors should never be used outside designated areas. The following letter reposted from a year ago contains a cautionary tale reminding us all to be extra careful with those anchors. Dear Sir, It is with regret, and in haste, that I write this letter to you - regret that such a small misundersta…

[image] dbeierl: Table of weights here: http://h-lift.com/anchorchain.htm From the table, taking one of the container-ships fitted with a 11 tonnes anchor, it uses 95mm chain. The mass of a shackle of cable is 5.4 tonnes only. The holding power from the cables are much smaller.

[image] Capt_Phoenix: You don’t want the anchor to hold in an emergency because it will part. You want it to drag on a short stay and slow the vessel down so you don’t hit anything. [image] Kennebec_Captain: Nobody is claiming that dropping anchors is applicable to every situation in an…

[image] Kennebec_Captain: And 50 tons is not nothing, I think that I am not saying 50 tonnes is nothing. It is no match to the huge momentum of the ship even at very slow speed. At that slow speed, it is not necessary so desperate to carry out such a risky operation.

We are talking about using an item in a manner that it was not intended to be used on most modern ships and therefore it was not built or designed for the loads your considering. And fatalities can occur, have occurred in the past, and will, unfortunately, continue to occur when people try to outsm…

About an help for a MsC about Emergency Anchoring

Professional Mariner Forum

Kennebec_Captain November 20, 2017, 11:48pm 50

This thead has was interesting: Anchors - Poor Man’s Tugboat

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About an help for a MsC about Emergency Anchoring

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