SimonKNZ
Active member
That's very interesting - certainly shows that Rocna would not solve this problem!
Anchor "toppling"
- Thread starter SimonKNZ
- Start date
rib
Well-known member
I personaly would not go to sleep with a 4 to 1 scope..6 to 1 min for this solo sailor
RupertW
Well-known member
We have often been in crowded anchorages where even 3:1 is only just possible if you don‘t mind being in beer passing distance as you both veer about. I’ve always slept well and seen surprisingly few people dragging in the usual 40 plus gusts thst spring out of nowhere in the hours after the sun sets. Most anchors will hold perfectly at 3:1 except in for more severe conditions. I do like having an anchor alarm though - it makes no difference at all but I sleep better.
SimonKNZ
Active member
I'm with RupertW on this one - 3:1 or a minimum of 20m (whichever is greater) is my usual and with crowded anchorages in the summer, any more becomes a liability. Tidal range around here is quite small (2.5-3m), which makes things easier. I use the "Peckish Sloth" anchor alarm on a separate phone, this can send a message via Telegram if the (very loud) alarm is triggered, so even if you're ashore, you know about it.
Cruising in NZ means anchoring nearly every night because there are very few visitors' marina berths or buoys, and this is my first dragging incident in 2 seasons with this boat, so I'm happy in general with my routine. I found the video linked above quite an eye-opener because it indicates that loss of holding after a sudden 180 degree direction change is far from unusual, almost expected. That would also explain why the anchorage became busy with moving boats on that particular night
Cruising in NZ means anchoring nearly every night because there are very few visitors' marina berths or buoys, and this is my first dragging incident in 2 seasons with this boat, so I'm happy in general with my routine. I found the video linked above quite an eye-opener because it indicates that loss of holding after a sudden 180 degree direction change is far from unusual, almost expected. That would also explain why the anchorage became busy with moving boats on that particular night
rib
Well-known member
You keep better company than me then ??.ive seen loads and with less wind.i dont seem to sleep well if the wind picks up in a busy anchorage...due to drifting yachts.and the time time it takes solo to sort my self let alone sort a tangled anchor chain mishap....i also keep anchor watch and depth alarm...just need to find a low consumption radar.....as a live aboard cruiser presently in the med it would be usefull ???? fair winds
Neeves
Well-known member
Hi Simon,
Go and speak to GMac at Chains, Ropes and Anchors - he stocks all the usual anchors, Rocna, Supreme, Delta etc etc - ask his advice, but Delta is really not top of the range and Rocna et al are proven to be a bit questionable.
Have a read of this:
Anchor Resetting Tests - Practical Sailor
This echoes the recommendations from Morgans Cloud aka AAC and the more recent tests by Steve aka Panope. This conclusions appears to be fairly consistent.....
Some people seem to think anchors will not somersault in a change of tide - reality appears to suggest otherwise.
We were anchored in a long bay, NE corner of Jervis Bay, NSW (Oz) in a long row of (20) yachts, there was a forecast 180 degree wind change but the wind developed to be much stronger than forecast. I was a bit twitchy and sat in the cockpit and watched a string of yachts, 4 of them drag one after the other. I don't know what all their anchor were, but at least one was a Delta. Having a number of yachts all drag is not unusual. Modern anchors tend to set more deeply as tension (wind strength) increases and when we decided it was getting uncomfortable, long fetch, too much chop, we decided to leave - we were the last to chicken out - our problem was the anchor was so deep set it tool patience to break it out.
If you do need to anchor with a short rode length and are unable to deploy sufficient scope:
The art of snubbing, in the nicest possible way - MySailing.com.au
How to: Dealing with Snatch Loads in an Anchorage
Anchor Snubber Tips
Crudely a decent 10m snubber will replace the catenary effect of 30m of chain at a 5:1 scope - for more information - read the article in the June issue of Yachting Monthly.
But for overnight - 5:1 would be a minimum for us.
A Snubber & Hook for all Occasions - Practical Sailor
Some of these articles are subscription only - contact me by PM - I might have pdfs available.
Stay safe over there, take care.
Jonathan
Go and speak to GMac at Chains, Ropes and Anchors - he stocks all the usual anchors, Rocna, Supreme, Delta etc etc - ask his advice, but Delta is really not top of the range and Rocna et al are proven to be a bit questionable.
Have a read of this:
Anchor Resetting Tests - Practical Sailor
This echoes the recommendations from Morgans Cloud aka AAC and the more recent tests by Steve aka Panope. This conclusions appears to be fairly consistent.....
Some people seem to think anchors will not somersault in a change of tide - reality appears to suggest otherwise.
We were anchored in a long bay, NE corner of Jervis Bay, NSW (Oz) in a long row of (20) yachts, there was a forecast 180 degree wind change but the wind developed to be much stronger than forecast. I was a bit twitchy and sat in the cockpit and watched a string of yachts, 4 of them drag one after the other. I don't know what all their anchor were, but at least one was a Delta. Having a number of yachts all drag is not unusual. Modern anchors tend to set more deeply as tension (wind strength) increases and when we decided it was getting uncomfortable, long fetch, too much chop, we decided to leave - we were the last to chicken out - our problem was the anchor was so deep set it tool patience to break it out.
If you do need to anchor with a short rode length and are unable to deploy sufficient scope:
The art of snubbing, in the nicest possible way - MySailing.com.au
How to: Dealing with Snatch Loads in an Anchorage
Anchor Snubber Tips
Crudely a decent 10m snubber will replace the catenary effect of 30m of chain at a 5:1 scope - for more information - read the article in the June issue of Yachting Monthly.
But for overnight - 5:1 would be a minimum for us.
A Snubber & Hook for all Occasions - Practical Sailor
Some of these articles are subscription only - contact me by PM - I might have pdfs available.
Stay safe over there, take care.
Jonathan
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