Fitting a larger anchor to a Sealine S37

DavidJ

DavidJ

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My Sealine S37 comes with a totally inadequate 10Kg delta anchor. Because of the nose design of the Sealine the anchor fits very neatly inside a resess. I want to fit a 15Kg (as fitted to the S38)
Has anyone fitted one. Does it fit in the resess and will the electric windlass motor require an upgrade.
I've e-mailed Sealine but no response.
David
 
If the new anchor doesnt fit, you could consider upgrading your chain, as this will have a similar effect. You would need to get a new gypsy for the same windlass, and make sure the new chain and gypsy are calibrated to each other.
 
I have often thought the anchor on my F33 to be too light and a larger one would not fit the space available. I wonder if its possible to fill the concave v shape void beneath the spade with about 1 lb. of liquid lead. Dave.
 
can't speak about the recess, but wd be amazed if the lecky motor needed upgrade - the main weight is the chain innit, plus having enuf oomph to break out the anchor, so it'l be reet as it is. I mean, it'll be okay - sorry, been oop North for a few days...
 
I once tried to upgrade the totally inadequate 10kg anchor on a 410 and Sealine confirmed it was'nt possible because of the design of the anchor beak. The Delta is not a bad anchor reputedly so I can't see that changing the type of anchor will help improve the situation. IMHO, the only option you have is to increase the chain size (and gypsy) to the maximum possible on the windlass and the use a longer scope of chain, say 5:1 or more
 
Hi David when we coded the F36 the surveyor reckoned it needed a larger anchor tis 13kg, he said 16kg. Now 16 wont fit into the hole as you say. You can sort by adding more chain, and thus letting more out giving more weight.
 
Going to www.lewmar.com, click Anchors, Delta, Selection Guide, choose 30-40ft, and the answer comes out as ...
...
...
10kg as the "standard" recommended choice, max size 16kg.

Maybe add more/heavier chain ?

dv.
 
Thanks Dave, useful site.
There is a neat example of windlass pulling power which shows significant margins of safety in windlass design so no need to upgrade. Also 15ft of 8mm chain weighs only 5Kg so going up a size could be significant for what I want.
 
filling the concave v shape void beneath the spade

[ QUOTE ]
I wonder if its possible to fill the concave v shape void beneath the spade with about 1 lb. of liquid lead. Dave.

[/ QUOTE ]

Oh NO... ABSOLUTELY NOT...

If filling the concave V shape void beneath the spade will improve its results, we will have done that for years..

The quantity of lead in this V shaped ballast is exactly calculated to exactly counter-balance the weight of the shank.. and therefore we could achieve 50 % of the total anchor weight on the tip.. If you fill the ballast with more lead, then the anchor will not come in the setting position and will not set properly, you will simply ruin a good anchor..
 
[ QUOTE ]
If the new anchor doesnt fit, you could consider upgrading your chain, as this will have a similar effect.
- just put more chain out.
- the only option you have is to increase the chain size
- You can sort by adding more chain, and thus letting more out giving more weight.
- I had'nt considered going up a size in chain but it's a really good idea.

[/ QUOTE ]

Everything you wanted to know about your anchor rode is on:
- Tuning an anchor rode : http://alain.fraysse.free.fr/sail/rode/rode_b.htm

If increasing the SCOPE will increase the holding, increasing the size of the chain WILL NOT increase your holding (or so little that it is not significant)

It is the anchor and NOT THE CHAIN wich hold the boat..
 
Thanks Alain, (from Urugury..wow!) what a great site. I must admit I did go to the conclusions first.

Your comment "If increasing the SCOPE will increase the holding, increasing the size of the chain WILL NOT increase your holding (or so little that it is not significant)
It is the anchor and NOT THE CHAIN which hold the boat.."

has set me thinking again (with my Sealine nose configuration) how I could increase the anchor size?

The problem in the Med is that you are rarely alone (my bit anyway!) so in 5 metres of water it's often only possible to put out 20 metres. Also the wind will often change direction several times during a stopover.
David
 
If the configuration of your bow roller will not allow you to increase the size of the anchor, why not choosing an anchor with an higher holding??

A recent anchor test has just been published (July issue) by the French magazine "Moteur boat Magazine" :
- The 10 kg Delta gave 500 Kg Holding ( 50 kg holding by Kg of anchor)
- The 14 kg Wasi (Bügel) gave 1200 kg ( 85.7 by Kg)
- The 12 kg Océane gave 1100 kg (91.6 by kg)
- The 6,8 kg Fortress gave 1100 kg ( 161.7 by Kg)
- The 4,5 kg Spade gave 1000 kg ( 222.2 by kg)

About the wind change of direction, the US magazine "Practical Sailor" did a reset test in sand (Volume 27 - Number 2 - January 15 - 2001)
Only two anchors aligned themselves with the new direction of pull without breaking out or moving: the Spade anchor and the Supert Max..

Disclaimer: Don't forget to have a look at my profile... :0)
 
That's really useful Alain
I have an emergency Fortress (about 10Kg or a bit less) which I never use. I think I will attach a decent bit of chain & rope to it and use it as well as my standard anchor on a day to day basis.
Taking into consideration that I will be handling it 'by hand' and probably placing it from my dingy what is the minimum sensible length/size of chain that I will be attaching my rope to, in your experience. I am usually in 5 to 10 meters of water with a sand/weed base.
Thanks
David
 
i think you can put out more chain - if you put down 30metres in 5m of water, you don't swing in a circle radius 30m nor 25metres unless blowing an absolute hooley and about to pull the anchor out - more like 10metre radius circles : the anchor and adjacent 10m of chain (or more depending on conditions) stay as originally laid.
 
hylas, I would'nt argue with the fact that it is the anchor that does most of the holding but the holding power of the anchor is much greater if the pull is parallel to the seabed and that is where a heavier chain can assist. Also a heavier chain has a larger catenary effect than a lighter one which serves to dampen shock loadings on the anchor
If it were the case that a heavier chain will not have a significant effect on holding power then why are heavier chains fitted to larger boats? This is less to do with the breaking strain of the chain which is far in excess of what is required but more to do with the catenary effect of the heavier chain
IMHO, it is well worth increasing chain size in order to maximise the performance of the existing anchor
 
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