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Author Topic: Stevns Arctic Build  (Read 37884 times)

Taranis

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Re: Stevns Arctic Build
« Reply #300 on: December 04, 2020, 09:42:33 pm »

I could do with your help Brian. I don't even know what they are called but the thingies that the anchor chains go over/through with a handwheel as the chains come up through the deck before going to the winch. Any pictures would be mucho appreciated if you get time  :-)
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ANDY
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Howard

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Re: Stevns Arctic Build
« Reply #301 on: December 04, 2020, 09:57:50 pm »

Hi Andy,
 are you on about cable stoppers.
                 Regards Howard.
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chipchase

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Re: Stevns Arctic Build
« Reply #302 on: December 05, 2020, 09:21:41 am »

I could do with your help Brian. I don't even know what they are called but the thingies that the anchor chains go over/through with a handwheel as the chains come up through the deck before going to the winch. Any pictures would be mucho appreciated if you get time  :-)


I think they are just referred to as chain stops Andy, then the chain goes over the gypsy on the windless, here are a couple of photos showing the ones i made for my Maltby.

Taranis

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Re: Stevns Arctic Build
« Reply #303 on: December 05, 2020, 09:59:38 am »

Thanks Howard close  :-)


Brian they are superb and just what I needed thanks  :-))
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ANDY
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marco

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Re: Stevns Arctic Build
« Reply #304 on: December 05, 2020, 10:34:22 am »

Bonjour ,


     On board the RMT PENFRET who is A 32m lenght approximatively the same tugboat there is this type of stopper .


marco



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Howard

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Re: Stevns Arctic Build
« Reply #305 on: December 05, 2020, 10:41:04 am »

Hello Andy,
 I was even closer as there called cable stops as the chain from the Anchor is called a cable. please keep on posting Andy as am really enjoying your build your such a skilled modeller you and chip make me jealous.
                  Regards Howard.
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derekwarner

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Re: Stevns Arctic Build
« Reply #306 on: December 05, 2020, 01:48:43 pm »

So in real life the anchor can be dropped, then held on the anchor windlass gypsy brake band to see if the anchor is firmly embedded, then the brake released & under hydraulic of DC/MG sets with the anchor chain is inched as necessary to have the chain stopper engaged in the next interleaving chain link & locked, then the brake band retightened


The windlass power shut down with the vessel is resting on the anchor + chain as locked in by the chain stopper


The brake bands are left in the tightened position......this serves two purposed, firstly to maintain tension by friction but also to minimise corrosion to the brake [usually ductile cast iron] drum


The design strength of chain stoppers is not 'generally' intended for holding the vessel in extreme weather, where the vessel would hopefully move our from such sea conditions


[Many years ago, I inspected the failed chain stoppers from a [light ship] 100,000 tonner when she was caught in a cyclone off Pt Headland  .....the stopper structure ripped from their mountings in the instant when the hydraulic brakes were released for the anchor windlass, in the attempt to disengage the stoppers]


So the excellent looking brass fabricated stoppers for the Maltby perform and do exact same function [but smaller size & smaller scale]


Derek
« Last Edit: December 05, 2020, 01:58:28 pm by derekwarner »
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Derek Warner

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Taranis

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Re: Stevns Arctic Build
« Reply #307 on: December 05, 2020, 03:30:28 pm »

My apologies Howard full marks  O0


Thank you for that detailed explanation of their use in practice Derek  :-)


Merci beaucoup Marco, trŤs bien.
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derekwarner

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Re: Stevns Arctic Build
« Reply #308 on: December 05, 2020, 09:37:49 pm »

Apologies, when I re-read this this morning [in the light of day] I realised one crucial point  :D


It is usual when hauling the anchor into the hawser until a enormous clunk or groan is heard  >>:-( .....the hydraulic relief valve also contributes to the symphony of sound with a screech


So then, the action is repeated by inching out the anchor chain until the next link of the chain can be locked ......from there, engage the brake band manually and shut the system down


The anchor weight is then supported by the chain stopper ....so on vessels large and smaller, the chain stopper also stops the anchor from repeatedly hammering into the hull in even moderate sea state
 
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Derek Warner

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chipchase

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Re: Stevns Arctic Build
« Reply #309 on: December 06, 2020, 08:35:42 am »

Apologies, when I re-read this this morning [in the light of day] I realised one crucial point  :D


It is usual when hauling the anchor into the hawser until a enormous clunk or groan is heard  >>:-( .....the hydraulic relief valve also contributes to the symphony of sound with a screech


So then, the action is repeated by inching out the anchor chain until the next link of the chain can be locked ......from there, engage the brake band manually and shut the system down


The anchor weight is then supported by the chain stopper ....so on vessels large and smaller, the chain stopper also stops the anchor from repeatedly hammering into the hull in even moderate sea state


So we all know how a windless and anchor cable stop works know.  :}

RST

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Re: Stevns Arctic Build
« Reply #310 on: December 06, 2020, 10:17:35 am »

Bit OT but an interesting read (I only knew of them as chain stoppers).  You sometimes also see an additional hold back to a padeye on deck mentioned here when the anchors fully stowed...


http://shipsbusiness.com/anchoring.html

I've often seen a sliding cover at the top of the hawse pipe so deck crew don't trip down the opening.  Crafting eyelets or those little eyelets with servo kits make quite convincing openings to the hawse pipes as well and you can block the bottom of them with a punched disc of polystyrene or soldered brass to save running a full pipe.
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derekwarner

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Re: Stevns Arctic Build
« Reply #311 on: December 06, 2020, 10:29:04 am »

As Chip says.......'So we all know now'..... well no Chip,  :D ... we still have 3 pages of using the Chain Stopper to allow the complete anchor chain be held & layered over the foredeck to allow for Classification Societies Survey......how are you with the chipping hammer?  {-)


The article from RST appears quite factual and explains more than I have missed, however with a few glaring errors...


1. it refers to the Chief Officer.........International Conventions confirm there are only two [2] members of the Crew with the Title of Chief.........the Chief Steward and the Chief Engineer...Deck Officers are the Captain, the First Officer & so on...


2. "Once the planned length of the chain is in the water, the guillotine bar should be dropped and secured, and the chain allowed to bear against the guillotine bar. The guillotine bar is designed to take the weight of the anchor cable.......this is incorrect as it fails to state and ensure the windlass brake drum is set or tensioned.......

Derek
« Last Edit: December 06, 2020, 11:11:45 am by derekwarner »
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Derek Warner

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Howard

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Re: Stevns Arctic Build
« Reply #312 on: December 06, 2020, 11:40:29 am »

Morning all,
 The covers at the top of the hawse pipes have more to do with stopping water from a bow wave coming up and flooding the deck then stopping the crew tripping  they are always closed unless lifting or dropping the anchor cable.
                       Regards Howard.
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chipchase

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Re: Stevns Arctic Build
« Reply #313 on: December 06, 2020, 06:04:39 pm »

Not a bad day today, managed to make the hawser outlets today

Howard

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Re: Stevns Arctic Build
« Reply #314 on: December 06, 2020, 07:27:54 pm »

As always Brian.
amazing work am learn more by watching your build and looking at you pictures then i ever get by reading a book  Am also watching Andy snapping at your heals he to seams to have bitten the plastic bug I thank you both.
          Regards Howard.
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Howard

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Re: Stevns Arctic Build
« Reply #316 on: December 06, 2020, 09:40:32 pm »

I wasn't being rude Brian what I meant was was Andy was a modeler I now like to watch his builds as much as yours as I learn so much from you two.
               Regards Howard.
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chipchase

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Re: Stevns Arctic Build
« Reply #317 on: December 06, 2020, 11:41:39 pm »

I know you were not being rude Howard  :-)) .


Regards Brian


RST

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Re: Stevns Arctic Build
« Reply #318 on: December 07, 2020, 08:29:54 am »

Hi Howard,


Yes, gosh you're right, I'm forgetting lots these days -too much time spent onshore.


Andy,


Thanks for keeping posting.  Am always impressed at rate of build!  That crane looks great, it doesn't look to have been too fiddly or delicate details in polystyrene moulds either?


Rich
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chipchase

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Re: Stevns Arctic Build
« Reply #319 on: December 07, 2020, 07:23:03 pm »

A bit work more done on the Arctic hawseholes today.



Brian

chipchase

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Re: Stevns Arctic Build
« Reply #320 on: December 08, 2020, 08:49:13 pm »

Managed to get a coat of primer on today starting to take shape.

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Re: Stevns Arctic Build
« Reply #321 on: December 08, 2020, 09:12:27 pm »

Nice to see you back building again Brian hope everything keeping OK
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chipchase

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Re: Stevns Arctic Build
« Reply #322 on: December 09, 2020, 02:02:51 pm »

Nice to see you back building again Brian hope everything keeping OK


Yes finally managed to get back onto the build Tom  :-)) things are OK


Brian





Howard

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Re: Stevns Arctic Build
« Reply #323 on: December 09, 2020, 04:08:41 pm »

That is good news Brian.
               Regards Howard.
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chipchase

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Re: Stevns Arctic Build
« Reply #324 on: December 09, 2020, 06:04:29 pm »

That is good news Brian.
               Regards Howard.


Cheers Howard.
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