Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 27-04-2014, 07:26   #31
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Boat: Bestevaer.
Posts: 14,678
Re: Mantus Anchor on Test

Quote:
Originally Posted by autumnbreeze27 View Post
I'd like to know if people weld the bolts, or put something on them to keep them from rusting?
The bolts are galvanised.
noelex 77 is offline   Reply With Quote
Old 27-04-2014, 07:58   #32
CLOD
 
sailorboy1's Avatar

Join Date: Jul 2007
Location: being planted in Jacksonville Fl
Boat: none
Posts: 20,364
Re: Mantus Anchor on Test

Anchor tests and discussions are just such old "news". Since there are still $1m boats coming new with CQR anchors I am starting to believe than in the end they haven't really gotten much more advanced than a rock with a hole in the middle for attaching with a rope.
__________________
Don't ask a bunch of unknown forum people if it is OK to do something on YOUR boat. It is your boat, do what you want!
sailorboy1 is offline   Reply With Quote
Old 27-04-2014, 08:39   #33
Registered User

Join Date: Feb 2009
Posts: 2,409
Re: Mantus Anchor on Test

Quote:
Originally Posted by autumnbreeze27 View Post
I'd like to know if people weld the bolts, or put something on them to keep them from rusting?

I'd like to see how one fails, and how that compares to a similar but welded together anchor. Maybe hook two together and use a tractor to pull them apart until one breaks.
Mantus supplies grease, I used 5200 on the bolts and also on the mating surfaces
motion30 is offline   Reply With Quote
Old 27-04-2014, 12:22   #34
Senior Cruiser
 
hpeer's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: Between Caribbean and Canada
Boat: Murray 33-Chouette & Pape Steelmaid-44-Safara-both steel cutters
Posts: 8,508
Re: Mantus Anchor on Test

Quote:
Originally Posted by autumnbreeze27 View Post
I'd like to know if people weld the bolts, or put something on them to keep them from rusting?

I'd like to see how one fails, and how that compares to a similar but welded together anchor. Maybe hook two together and use a tractor to pull them apart until one breaks.
Galvanized. I got two sets of bolts with my anchor. Mistake?

But I also paint my anchors with zinc epoxy paint. Having two steel boats I have it around and it's someplace to use up your last few brush dulls without pitching it. Can't see any harm to it.
hpeer is offline   Reply With Quote
Old 27-04-2014, 12:37   #35
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Boat: Bestevaer.
Posts: 14,678
Re: Mantus Anchor on Test

Quote:
Originally Posted by hpeer View Post
Can't see any harm to it.
It is common practice. And I think helps extend the life of the galvanising. It can also be used to make the anchor more visible underwater.
Finally it makes the anchor a bit less likely to be stolen.

However, there have been cases where galvanisers refuse (or charge more) to re-galvanise painted anchors.

One of the advantages of the Mantus anchor is that transport and regalvanisising will be easier especially for larger models. Anchoring full time in hard sand I find galvanising only lasts 3-4 years so it can be an important issue.
noelex 77 is offline   Reply With Quote
Old 27-04-2014, 13:36   #36
Moderator
 
DoubleWhisky's Avatar

Cruisers Forum Supporter

Join Date: Oct 2010
Location: Home at Warsaw, Poland, boat in Eastern Med
Boat: Ocean Star 56.1 LR
Posts: 1,841
Re: Mantus Anchor on Test

Quote:
Originally Posted by sailorboy1 View Post
Anchor tests and discussions are just such old "news". Since there are still $1m boats coming new with CQR anchors I am starting to believe than in the end they haven't really gotten much more advanced than a rock with a hole in the middle for attaching with a rope.
For me it is just sad thing, how the many builders go for such a small savings on >$1m boats...
And it make me thinking about savings on cheaper boats...
DoubleWhisky is offline   Reply With Quote
Old 27-04-2014, 15:58   #37
cruiser

Join Date: Feb 2011
Location: Pittwater, Sydney
Boat: Lightwave, Catamaran, 11.5m (38')
Posts: 1,000
Re: Mantus Anchor on Test

Mine came with, grease, spring washers and the bolts were galvanised. If as, partially, intended you frequently dissasemble I'm not sure how long the gal will last - maybe that's why people get two sets of bolts? My bolts were mild steel - hence my interest in whether Noelex checked - given they are a rather critical component.

I'd be recommending that anyone buying throw the bolts away (if they look as grotty as mine did) and replace with US made gal construction bolts. Cheap, imported, (gal) construction bolts are notorious.

Jonathan
JonJo is offline   Reply With Quote
Old 28-04-2014, 16:22   #38
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Boat: Bestevaer.
Posts: 14,678
Re: Mantus Anchor on Test

I usually find that galvanised shackles have about the half the lifespan of the galvanising on the anchors, but these are subject to wear from movement between the shackle and chain or anchor attachment point. This movement wears off the galvanising.

The anchor bolts are not subject to any movement so should have a similar life to the rest of the galvanised finish. If it is a bit shorter they are easily replaceable.
noelex 77 is offline   Reply With Quote
Old 28-04-2014, 16:35   #39
cruiser

Join Date: Feb 2011
Location: Pittwater, Sydney
Boat: Lightwave, Catamaran, 11.5m (38')
Posts: 1,000
Re: Mantus Anchor on Test

Noelex,

I was thinking more in terms of someone who wants to frequently disassemble (which is supposed to be one advantage of the Mantus) where the gal would be worn off the threads. This has 2 issues, one the gal wears off with potential for corrosion and bolts to be galvanised are made over size (or the nuts are) and with loss of gal you lose some security. No one would use an anchor shackle without securing the pin, mousing, Loctite, peening - where is the security on the Mantus bolts - a spring washer?

I think if the anchor is left assembled the gal, in the critical areas, will last as long if not longer than the gal on the anchor. Though any bolt corrosion will not be seen.

Most anchors last for ever, most people would expect their anchor to last forever, most people (once they have an anchor) never think seriously about it again - I'm not sure that checking bolts will occur to most people - after all, anchors last for ever. You results will be viewed critically here but those 'most' people, some, will treat them as gospel - and not checking the bolts before using them does not engender much comfort.

But I still would be wary of imported HT gal bolts. Buying European or American gal HT bolts is not a big cost.

Jonathan
JonJo is offline   Reply With Quote
Old 28-04-2014, 16:51   #40
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Boat: Bestevaer.
Posts: 14,678
Re: Mantus Anchor on Test

Quote:
Originally Posted by JonJo View Post
Most anchors last for ever, most people would expect their anchor to last forever, most people (once they have an anchor) never think seriously about it again - I'm not sure that checking bolts will occur to most people - after all, anchors last for ever.
I wish this was true
Anchoring full time in hard sand galvanised anchors only last about 4 years before they need regalvanising.

The anchor shackle (which is single bolt verses 4 which hold the anchor shank) is in area that is subject to movement and wear of the galvanising is going to need far more inspection than the 4 bolts that hold the shank to the fluke.

Especially as there is considerable redundancy in the bolts. Mantus claim that:
"Although the shank is attached to the fluke with 4 bolts, a single bolt has sufficient strength to handle the maximum expected load on the anchor."
noelex 77 is offline   Reply With Quote
Old 28-04-2014, 17:04   #41
cruiser

Join Date: Feb 2011
Location: Pittwater, Sydney
Boat: Lightwave, Catamaran, 11.5m (38')
Posts: 1,000
Re: Mantus Anchor on Test

Quote:
Originally Posted by noelex 77 View Post
I wish this was true
Anchoring full time in hard sand galvanised anchors only last about 4 years before they need regalvanising.
You are lucky (or unlucky in terms of anchor longevity), most people only anchor a few times a year and its the 'most people' who form the bulk of the market for anchors (and any yacht equipment).


I'm surprised Andrew has not made a comment - he has pretty strong views on HT chain, it seems difficult to believe he would not be equally critical of gal HT bolts.

Jonathan
JonJo is offline   Reply With Quote
Old 13-05-2014, 09:17   #42
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Boat: Bestevaer.
Posts: 14,678
Re: Mantus Anchor on Test

Quote:
Originally Posted by JonJo View Post
Before you grind the bolts smooth (in use) I wonder what specification of bolts you have with your model - they will be clearly marked on the bolt heads.
I finally got a photo of the bolts as requested by Jonathan. Sorry for the wait. The heads of the bolts are only visible under the anchor (the tightness can be checked from the top looking at the amount of thread visable above the nut)

In the end a friend made it easy by photographing the underneath of the anchor from his dingy while the anchor was on the bow roller. Thanks Andy.

The Mantus is now back on the seabed, where all anchors belong

Here is the photo:
Attached Thumbnails
Click image for larger version

Name:	image.jpg
Views:	276
Size:	362.5 KB
ID:	81090  
noelex 77 is offline   Reply With Quote
Old 13-05-2014, 09:30   #43
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Boat: Bestevaer.
Posts: 14,678
Re: Mantus Anchor on Test

Andy also took this underwater photo of my anchor coming up.
Attached Thumbnails
Click image for larger version

Name:	image.jpg
Views:	279
Size:	276.3 KB
ID:	81091  
noelex 77 is offline   Reply With Quote
Old 13-05-2014, 09:39   #44
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Boat: Bestevaer.
Posts: 14,678
Re: Mantus Anchor on Test

Plus this artistic one:
Attached Thumbnails
Click image for larger version

Name:	image.jpg
Views:	268
Size:	299.9 KB
ID:	81096  
noelex 77 is offline   Reply With Quote
Old 13-05-2014, 22:56   #45
cruiser

Join Date: Feb 2011
Location: Pittwater, Sydney
Boat: Lightwave, Catamaran, 11.5m (38')
Posts: 1,000
Re: Mantus Anchor on Test

Hi Noelex,

Your bolts appear to be Metric (odd coming from America) HT bolts Class 8.8, 800 MPa. Normally they would be marked also 8.8, but marking standards vary. Imperial Class 5 bolts have similar marking pattern (you would think it would not be difficult to have international marks without confusion) but the radial marks on the Imperial Class 5 are almost the complete radius in length, rather then the short radial ticks on the metric Class 8.

I hope yours are American sourced galvanised metric Class 8.8.

Thanks for the image

Jonathan
JonJo is offline   Reply With Quote
Reply

Tags
anchor, Mantus

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
February Giveaway: Win a Mantus Anchor! SaucySailoress Mantus Anchors 681 01-03-2013 10:35
To Test or Not to Test... hotspur Families, Kids and Pets Afloat 13 29-07-2010 04:43

Advertise Here


All times are GMT -7. The time now is 01:36.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.