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TOPIC: What style and size of anchor???

What style and size of anchor??? 18 Jun 2009 05:14 #1

  • a1machinista1
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1991 capri 17'


This boat will mostly be used to wakeboard, but we will also be hitting the columbia for sturgeon:arr:arr.. I need to buy and anchor and line!! So what should I start looking at????? What size and style??? I wont be dropping anchor in any fast moving water. Im more concerned with user friendly.

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What style and size of anchor??? 18 Jun 2009 09:07 #2

  • ChancesAre
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for ease of use with small boats in easy conditions. I would use chain at least the length of the boat and then line for whatever depths you anticipate. A good length of chain makes a Danforth style set a lot easier.

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What style and size of anchor??? 18 Jun 2009 12:15 #3

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I'd suggest a Bruce with chain equal to the length of the boat and 100 feet of non-floating 3 twist line line over the Danforth because the flutes on the Danforth float on the shaft and it is a bit harder to handle (still a good anchor though). The Bruce is one piece. A Delta is another good choice for a one piece anchor.

Do not use polypropylene rope! It wears easily and you will lose the anchor plus it floats so is not good for anchoring.

How deep is the water? For rope you need 5 to 7 times the depth for overnight anchoring. If it's just lunch, you can shorten up some depending on bottom.

Larry

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What style and size of anchor??? 18 Jun 2009 13:13 #4

  • whiskywizard
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There's good anchor selection info available in a number of places. Here's one from West Marine

I'd suggest a 9 lb Danforth, 10' of 1/4" chain and enough 3/8" 3-strand nylon to give you 8 times the deepest water you'll need to anchor in.

Above Larry suggests a Bruce type anchor. I am a big fan of Bruce anchors and I would suggest that too, for better holding, but if you will only anchor for fishing and "awake" activities I think the Danforth is adequate and it lays flat when stored. More chain is better but it's also heavier and more difficult to retrieve. Again - since you're not sleeping at anchor, Larry's answer is technically right, but 10' might be enough.

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What style and size of anchor??? 18 Jun 2009 15:48 #5

  • bayskipper
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I'm thinking you'll be using this for a lunch hook. I have a 2850 CB and use a 13# Dansforth style with 15' of chain at 2-1 or 3-1 for a lunch hook. I use more scope if I'm going to stay overnight. This is in the Columbia in the Vancouver area. Never a problem.

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What style and size of anchor??? 19 Jun 2009 01:56 #6

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You should check with locals to see what they use for the bottom conditions you boat in.

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What style and size of anchor??? 19 Jun 2009 05:06 #7

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bayskipper;311573 wrote: I'm thinking you'll be using this for a lunch hook. I have a 2850 CB and use a 13# Dansforth style with 15' of chain at 2-1 or 3-1 for a lunch hook. I use more scope if I'm going to stay overnight. This is in the Columbia in the Vancouver area. Never a problem.





Well I really appreciate the input. only problem is i have no idea whay you just said? lunch? scope?

I do use scope after lunch??:kidding


2-1?? 3-1???

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What style and size of anchor??? 19 Jun 2009 05:07 #8

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And why up to 8 times the length???

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What style and size of anchor??? 19 Jun 2009 10:24 #9

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a1machinista1;311908 wrote: And why up to 8 times the length???


I assume this is directed at my response.

The anchor is firstly a piece of safety equipment. You must be able to secure the boat's position in the event of engine failure. That means you need to have on board enough rode to deploy a 7:1 scope.
[ 7 x (the depth of water plus the height of your bow above water) ]

The 8:1 extra gives you enough line left over to secure the rode to the boat.

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What style and size of anchor??? 19 Jun 2009 13:31 #10

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ok so lets say I am in 20 ft of water and my boat is 3 feet tall.
scope is 23' ??? Why is it important to have 7:1 ???

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What style and size of anchor??? 19 Jun 2009 13:56 #11

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the best way i can think of it is to have bounce / bobble room as you get
knocked aroud by the wave and such you want to have enough room / scope
to make up for the movement of the boat with out pulling up the anchor
longer the line out the more free play you have till the hook gets yanked out
you want to be a cork in the water and not held bow down tight

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What style and size of anchor??? 19 Jun 2009 15:18 #12

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a1machinista1;311996 wrote: ok so lets say I am in 20 ft of water and my boat is 3 feet tall.
scope is 23' ??? Why is it important to have 7:1 ???

NO! Since depth varies, your scope needs to be though of as a forumla.... actually, a "ratio" ... not a dimension of rode..... not yet!
Using this ratio, you come up with a dimension or length of rode.

Example: Let's say that you are in 20' of water. The dimension will be a resulut of 20' of water w/ a scope of 7:1

20' x's 7 = 140

Now add the bow height of 3'.

140' + 3' = 143'

This is the amount of rode let out to get the 7:1 scope.


Make sure that you have more than enough rode on board.

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What style and size of anchor??? 19 Jun 2009 15:44 #13

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2850Bounty;312064 wrote: NO! Since depth varies, your scope needs to be though of as a forumla.... actually, a "ratio" ... not a dimension of rode..... not yet!
Using this ratio, you come up with a dimension or length of rode.

Example: Let's say that you are in 20' of water. The dimension will be a resulut of 20' of water w/ a scope of 7:1

20' x's 7 = 140

Now add the bow height of 3'.

140' + 3' = 143'

This is the amount of rode let out to get the 7:1 scope.


Make sure that you have more than enough rode on board.


That's not the way I understand it Rick.

Scope is a ratio of cable length (rode) to (depth plus height). You must add the depth qnd height before multiplying.

Minimum safe scope is considered to be 5:1. 7:1 is for heavy weather. Relying on the anchor as a safety device may mean doing so in heavy weather and with no chance to re-set the hook.

Using your numbers, rode length should be
=7 x (20+3)
=7 x 23
= 161 ft.
So in practical terms, he can claw that number back a wee bit; he needs to buy 150' of 3-strand rope and 10' of chain. This does not allow any extra left over to cleat it or secure it below decks in an anchor locker.

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What style and size of anchor??? 19 Jun 2009 15:46 #14

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a1machinista1;311996 wrote: ok so lets say I am in 20 ft of water and my boat is 3 feet tall.
scope is 23' ??? Why is it important to have 7:1 ???

russ60477;312007 wrote: the best way i can think of it is to have bounce / bobble room as you get
knocked aroud by the wave and such you want to have enough room / scope
to make up for the movement of the boat with out pulling up the anchor
longer the line out the more free play you have till the hook gets yanked out
you want to be a cork in the water and not held bow down tight


Russ covered it. Anchors hold best when pulled horizontally. The less scope you have, the closer to vertical the pull is on the rode. The more chain you have, the heavier the rode and the more horizontal the pull.

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What style and size of anchor??? 19 Jun 2009 16:09 #15

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whiskywizard;312080 wrote: That's not the way I understand it Rick.

Scope is a ratio of cable length (rode) to (depth plus height). You must add the depth qnd height before multiplying.

Minimum safe scope is considered to be 5:1. 7:1 is for heavy weather. Relying on the anchor as a safety device may mean doing so in heavy weather and with no chance to re-set the hook.

Using your numbers, rode length should be
=7 x (20+3)
=7 x 23
= 161 ft.
So in practical terms, he can claw that number back a wee bit; he needs to buy 150' of 3-strand rope and 10' of chain. This does not allow any extra left over to cleat it or secure it below decks in an anchor locker.

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+1

Have a look in the library, DMCB has spent more time at anchor than most of us spend on out boats. He wrote a very good article on anchoring. I have 100' 1/4" chain and 100' of 3/8 rope for my 2755 and my 300SD with a 22lb claw anchor, never slipped and I sleep like a baby on the hook.

Ken

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What style and size of anchor??? 19 Jun 2009 16:37 #16

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Mike and Ken, you are correct.... I made a boo boo...... I needed to add the 3' to the 20' making it 23'.:hammer
7 x (20+3) = 7 x 23 of which = 161 ft.

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What style and size of anchor??? 19 Jun 2009 16:53 #17

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Go over to West Marine at Delta Park. Tell the guys what you are going to do, buy one of there pre-made anchor setups sized for your boat and away you go. That set up should work for the Columbia around Vancouver, Sauvie Island, lower Willamette, anywhere like that. Before I knew what scope was I anchored in the Willamette and around Sauvie and did just fine. Just let out more line that you think you need and you should be OK. Just be careful what's downstream until you figure it out. All the above info should help.

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What style and size of anchor??? 20 Jun 2009 02:25 #18

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well I really appreciate all the info. I think im going to see what anchor steve the (po) has to give me and then atleast I think i will get a 7 gallon bucket and fill it with 3/8 rope and 10' of 1/4 chain???? Im sure the columbia ia alot deeper than 20' in spots, so I would think a 7 gal bucket should hold a couple hundred feet>>> Oh and bayskipper how would you like to be the first one to show me were the good fishing is on the columbia?? my brother in law is really up my arse about finishing this boat so we can hit the river for some fishing... And im sure theres alot more than I realize about things i need to learn so I can feel well informed as I am out with family..and friends

Just think by eduacating me you might save a life?:D

Really just looking for a good fishing hole

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What style and size of anchor??? 20 Jun 2009 02:38 #19

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I really would if I knew, but I'm not into fishing. How come so many people think if you have a boat you must fish? Sorry about that, I'm sure you'll find plenty of spots. I've heard the lower Willamette is good for sturgeon. And NO I'm not just keeping them a secret.

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What style and size of anchor??? 20 Jun 2009 06:37 #20

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Ok I got ya skipper..........;)

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