Anchors - Bigger is Better ?

[Delfin]

Originally Posted by Coops

No, no alarm needed, he only said that he personally would not get a straight answer. He did not state that anyone else would not get one.

Ah, see you got it by the last post.

Coops.

Yep, thanks for chipping in Coops. Only Shas would not get a straight answer; everyone else would. Quite clear.

[downunder]

Originally Posted by Coops

No, no alarm needed, he only said that he personally would not get a straight answer. He did not state that anyone else would not get one.

Ah, see you got it by the last post.

Coops.

Definitely need for alarm when so many mods get involved in an interesting thread. What was it that usually happens now ?

[Coops]

Usually about now I crack another beer and keep reading the posts of the day. We are sailors as well as mods so we do have a personal interest in topics as well.

Coops.

[noelex 77]

Originally Posted by congo

Sorry but I miss quoted on the Alloy specs 7705 it should have been 7075.

7075 is a very strong aluminium alloy, but it does not have sufficient corrosion resistance for use in salt water.
Why not use one of the marine grade alumnium alloys like 5083 or Sealium? Even some of the 6 series are OK.

7075 has 1.2-2% copper

Aluminium has a higher strength to weight ratio than steel so you are going to end up with a lighter shank ( which should make the anchor balance better). Making it a bit thicker in a proper marine grade aluminium should not create any problems the extra drag of the thicker shank can easily be reduced by tapering the leading edges, as Fortress do so successfully.

[congo]

Noelx Wrote:

7075 is a very strong aluminium alloy, but it does not have sufficient corrosion resistance for use in salt water.
Why not use one of the marine grade alumnium alloys like 5083 or Sealium? Even some of the 6 series are OK.

7075 has 1.2-2% copper

Aluminium has a higher strength to weight ratio than steel so you are going to end up with a lighter shank ( which should make the anchor balance better). Making it a bit thicker in a proper marine grade aluminium should not create any problems the extra drag of the thicker shank can easily be reduced by tapering the leading edges, as Fortress do so successfully.


Rex Wrote:
Noelex you could be right, time will tell, if left in salt water for very long periods of time corrosion could be a problem, as an anchor application we have been told by our suppliers corrosion will not be an issue.
Meanwhile we have these anchors circulating now for three years as a primary anchor, so far so good.
Regards Rex.

[Shas Cho]

Originally Posted by Delfin

Nope quite clear. You are the only one who AR would not give a straight answer to. Got it.

Good man.
I never even thought of hinting anything more than that.
I guess I considered it to have been in the nature
of a private, or at least personal remark
in a public venue.

-S

[Shas Cho]

Originally Posted by Ocean Girl

Shas, you've sparked up the old BIB thread, ruffled feathers, and , dare I say, act like a true rabble rousing anchor nerd. If you don't belong here, I'll eat my beautiful Manson supreme . Welcome to CF

Gee, thanks, Ocean Girl!
Maybe I should come over and join the Mermaids Group, too!
:=)

[ternmarine]

Originally Posted by Delfin

Hmmm, I'm looking at a Tern right now, and it looks an awful lot like your effort, problem bends and all. But whatever you say....

The major difference being that ours will work.

[JonJo]

My query on holding capacity sank - like an anchor.

I did not explain well.

Many anchor tests, using tug boats (of which Noelex is very supportive) show a 15kg anchor to have a holding capacity of 2t. This is a capacity well beyond that needed to hold the yacht for which it would be rated, say 35'-40'. So what is wrong with these tests that they show such a high capacity but no one believes in them>

And Shas, forget the monster locks you seem to need to keep intruders out, here no-one need to lock their doors. Not sure of where you live Maybe that's why we call it the 'Lucky Country', save money on door locks and invest in decent anchors?

Jonathan

[Coops]

Whatever you do then, don't move to the gold coast Jonathan, they lock everything there.

Coops.

[ternmarine]

Originally Posted by Coops

Whatever you do then, don't move to the gold coast Jonathan, they lock everything there.

Coops.

including the natives

[JonJo]

Different country up there, man eating crocodiles, deadly jelly fish, cyclones - but they do make rum

But Coops, you seem to be coming south - you'll not want to leave!

Jonathan

[Coops]

I started south. Came back. PS no crocs on the gold coast, only old ones wearing polo shirts with the collar turned up.

PPS. They make an imitation rum.

Coops.

[careka]

Boat came with a Delta 20 kg, changed it out with a Rocna 20kg, but now went up to 33kg Rocna, i like to sleep well. on a Lagoon 380.

[JonJo]

Noelex,

Reverting back to your negativity on Classification Society testing - Rocna has SHHP for its anchors from RINA (and I have nothing against RINA). Are you saying this certification is a complete waste of time and nor worth the paper (or web space) its printed on?

I share some of your criticisms but its all we have and thus, I think, better than nothing.

Jonathan