Mantus Anchor Tolerance/Specifications

[Sailorman Ed]

This is kind of interesting.
I went to the updated chart Greg posted and see that they posted the weights and dims in metric and the dimensions were all 3 significant digits, implying an accuracy of 1 mm ( .039" ). Had they posted the "A" dimension as 490 vs 493, then it would have been only 2 significant digits and an implied accuracy of 10 mm (.39")
And the weight is showing 15.9 kg (3 significant digits) implying an accuracy of .1 kg (.2 lbs)

It weighs 31lb 12oz and the blade measures 19" long vs the specified 19.75".

So from a significant digit perspective, it does seem that the original poster did not get even close to what the UPDATED chart suggests. Of course the updated chart is quite vague and no tolerance is indicated.

Note that the 25 kg model has only 2 significant digits so the implied weight tolerance is 10x as great.

Interestingly, I checked Rocna and they have only 1 or 2 siginficant digits for their weights but they do show dimensions ( and a better quality "print") so also imply the same tolerances as Mantus.
Yes, nitpicky but we all learned this in high school (ok, but it was at least presented to you in high school, not sure you learned it )

[PetePetePete]

I've been watching this thread because I'm about to buy a Mantus anchor...

What I think would be interesting to know would be the actual weight and dimensions of a 25#... because if that's accurate - that would tell us that there's something "up" with the 35#.

Also... when I look at the chart WHY is "B" on the 35# much SHORTER than "B" on the 25# or the 13#??

I don't profess to know a dang thing about anchors... just curious.

Thanks,
Pete

[evm1024]

Well I suppose we could hold manufacturers feet to the fire and demand accuracy in their specs. And to a drgree we should - but then again there is a marketing angle where the label of the item is not entirely accurate.

Take my Boston Whaler - it is a Montauk 17 but the boat is actually 16' 8". From a marketing viewpoint 17' sounds better than 16' or even 16.6'. No one thinks that I was cheated out of 4". And the boat is still quite capable and fun to operate.

Many sailboats are listed as (oh say) 35' when I have seen that they were anywhere from 33'8" to 35'7". And they were fully functional.

Getting back to anchors - I think it is fair to allow an anchor manufacturer a little leeway in naming their anchor. A 33 pound anchor might be advertised 35 pounds for marketing reasons. All the while the actual holding power scales in logical steps across the range of anchor sizes.

Also, if we simply assume that the steel plate used has a thickness variation of +-5% (actually it looks like there is a spec for 10% tolerance for 1/2" steel plate - 55 thousandths but lets use 25 thousandths or 5%).

And assume that the steel used density is 0.28125 pounds/cu in we find that a Nominal 35# anchor (124 cu in steel) could weigh between 33 pounds and 36.6 pounds.

That's just the tolerance in the raw steel plate. We should also assume that there is some cutting tolerance as well.

And one last disclaimer - I am speaking general. I have no special insight to Mantus anchors. But I would like to say that we live in a great age where the anchor designer will actually talk to us. A very good thing.

[a64pilot]

I wonder how much variation there is in Galvanizing too.
There are tolerances in everything, making tolerances small is expensive

[Sailorman Ed]

First, let me say that I respect Mantus and the products they offer. I am not bashing their products. i have been impressed with their innovation.
I looked again after evem1024's comments and they do not list a model 25 or model 35, they list 25 lbs and 35 lbs and 11.4 kg and 15.9kg. And the dimensions are listed TO THE MM (.039 inches) . It is more of a truth in advertising issue, especially since Greg went back and "corrected" his web page. Mantus also has the issue that they are made of several components, each of which has it's own tolerances. And they are cumulative.

BTW, I have a boat advertised both as a model 40 and as a model 42 but in reality is actually 39 ft 4 inch. Previous boat was sold as both a 34 and 35 but exactly the same length boat, just marketing.

[Panope]

I had the opportunity to weigh 6 galvanized steel anchors with the same scale on the same day:

Anchor-------Claimed Weight:--------Actual Weight:

Mantus-------------45 lbs.----------------40 lbs.
Excel---------------48 lbs.----------------50 lbs.
Manson Supreme--45 lbs.----------------47 lbs.
Spade--------------44 lbs.----------------44 lbs.
Super Sarca--------34 lbs.----------------34 lbs.
Bruce (Genuine)---44 lbs.----------------44 lbs.

Steve

[ErikFinn]

Why are Mantuses weighing in consistently LESS than their advertised weight (it appears), as opposed to other manufacturer's anchors which appear to be as advertised or even HEAVIER?

[PetePetePete]

Originally Posted by Panope

I had the opportunity to weigh 6 galvanized steel anchors with the same scale on the same day:

Anchor-------Claimed Weight:--------Actual Weight:

Mantus-------------45 lbs.----------------40 lbs.
Excel---------------48 lbs.----------------50 lbs.
Manson Supreme--45 lbs.----------------47 lbs.
Spade--------------44 lbs.----------------44 lbs.
Super Sarca--------34 lbs.----------------34 lbs.
Bruce (Genuine)---44 lbs.----------------44 lbs.

Steve

As a person who is ready to buy one (Mantus) and likely still will... I'm...

[a64pilot]

Interesting how anchors are classified by weight.
In all honesty, how much has weight got to do with holding power?
Yeah I know, you have to class them somehow, and weight is as good a means as any I guess, but I bet lb for lb, My Rocna has a lot more holding power than my CQR


I think the issue here is that the Mantus 25 and 35 are so close as to not be a significant difference?

[PetePetePete]

Originally Posted by a64pilot

Interesting how anchors are classified by weight.
In all honesty, how much has weight got to do with holding power?
Yeah I know, you have to class them somehow, and weight is as good a means as any I guess, but I bet lb for lb, My Rocna has a lot more holding power than my CQR


I think the issue here is that the Mantus 25 and 35 are so close as to not be a significant difference?

I'm trying to figure out why the 35 is a lot shorter than the 25. Any idea?

[roverhi]

If I needed an anchor that I'd use only very occasionally, with much warning, to store in some small remote cranny could see why I might want one that is bolted together. Since I have no need for such a beast, am very happy with welded together Manson Supreme which is huge and actually weighs at least 15 Kilos as advertised.

For a regularly used anchor just can't see why anyone would want a bolted together one with the possibility, even though remote, that the bolts could fail and leave me with only the chain holding me in position.

[PetePetePete]

Originally Posted by roverhi

If I needed an anchor that I'd use only very occasionally, with much warning, to store in some small remote cranny could see why I might want one that is bolted together. Since I have no need for such a beast, am very happy with welded together Manson Supreme which is huge and actually weighs at least 15 Kilos as advertised.

For a regularly used anchor just can't see why anyone would want a bolted together one with the possibility, even though remote, that the bolts could fail and leave me with only the chain holding me in position.

That seems extreme no? By that logic, you would take a Delta 22 over a Mantus 25?

Just asking - not trying to be a wise guy.

[sailorboy1]

Originally Posted by a64pilot

I think the issue here is that the Mantus 25 and 35 are so close as to not be a significant difference?

Close???? That's a 40% difference in weight.

[B-Baysailer]

I weighed my anchors that I have or had and this is what I come up with
44# DELTA 45lb sold the anchor
#5 excel 49lb
45#supreme maybe 41 lb shank is .472 or 12mm not 16mm like panope anchor
60# supreme I think it weighed 56lb it's in a locker on the boat .the shank is .625 or 16mm not 20mm like snowpetrel 20mm
The excel is the best anchor I have

[Panope]

Originally Posted by B-Baysailer

I weighed my anchors that I have or had and this is what I come up with
44# DELTA 45lb sold the anchor
#5 excel 49lb
45#supreme maybe 41 lb shank is .472 or 12mm not 16mm like panope anchor
60# supreme I think it weighed 56lb it's in a locker on the boat .the shank is .625 or 16mm not 20mm like snowpetrel 20mm
The excel is the best anchor I have

Thank you B-Baysailer, for this very interesting information. The fact that anchor makers are changing material thickness (and who knows what else?) makes comparing and testing anchors that much more difficult.

I bought my Manson Supreme second hand in 2012. It was slightly used so we really do not know when it was manufactured. Can you tell us when your Manson anchors were manufactured?

Steve