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Old 10 January 2008, 12:39   #11
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Country: UK - England
Town: Gosport
Boat name: April Lass
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We rarely anchor our dive rib but use a shot line instead, last pair of divers half fill the lifting bag attached to the weight so that when you start to pull up the shot it quickly fills and lifts.

For deep diving we use a breeze block attached to farmers bale twine rolled around a 25 litre drum which unwinds when you chuck it in.

Rib is kept moving patrolling the dive site.

Pete
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Old 10 January 2008, 13:05   #12
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Country: USA
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I got what we call a Navy style over here cause with limited scope you do rely on mass and a friend's sportboat has had good success with his 15lb Navy. This is what they look like (attachment) to translate the English

I don't have access to the Rocna anchors here in the states. But basically I have no issues anchoring in sand or mud or rock (the anchor snags or digs in). But gravel is like marbles underneath and I just drag along even with 8 :1 (or more) scope (e.g. a shallow site).

Obviously I am rarely using what a yachty would even consider an anchorage. I mean its a divesite afterall, not a 30ft deep sandy bottomed embayment, lol.

Based on some local suggestions I'm going to try a Danforth style and see how it works. 8 or 9 lbs is fairly oversized for the boat but managable for my arms. The extra mass will help for deeper sites when suitable scope is impossible to pay out. I do have a sentinal I can use for these too.

I figure the points on the Danforth might be able to insert themselves in between the gravel/stones like the Navy has been unable to. I have the benefit of always being able to check and/or reset it if I don't like how its laying on the bottom or just marginally snagged at a rocky site.

Thanks

ps we do use a live boat with a vertical shot line for some sites. But I'd rather not arrange for a boat tender at a site where diving from an unattended boat is fine solely because I have a sucky anchor.
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Old 10 January 2008, 15:22   #13
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Country: UK - Wales
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As I thought the navy anchor is a Hall's stockless or similar. The actual fluke area is still quite small - hence a Delta or Danforth will give better holding.
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Old 10 January 2008, 15:57   #14
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Country: UK - England
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I have always sworn by the CQR style anchour. I use a 15lb with 4m of chain and never have any problems.

Ian
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Old 10 January 2008, 16:04   #15
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The only drawback I have found with the CQR is the pivoting shank. It makes stowing harder and also makes it harder for the anchor to set - things designs like the Delta overcome.
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Old 10 January 2008, 19:40   #16
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Quote:
Originally Posted by codprawn View Post
As I thought the navy anchor is a Hall's stockless or similar. The actual fluke area is still quite small - hence a Delta or Danforth will give better holding.
Yeah the lack of sharp points seems to allow the whole thing to "skate" along on top of gravel (in particular). Not so much a lack of fluke area, more the lack of bite through the surface gravel into something solid.
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Old 10 January 2008, 19:47   #17
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So 9lb or 14lb Delta??
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Old 10 January 2008, 23:01   #18
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Obviously the bigger the better!!! I have a 14lb one and it's great but our waters are ver shallow so nice long scope. Don't forget an angel on the line - it really helps a lot when your scope is limited.
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Old 11 January 2008, 12:25   #19
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Pete 7

Surely you mean a cavity block. Breeze blocks float . Nearly!
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Old 11 January 2008, 12:32   #20
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Ahhh English...

I assume you all are refering to what we call a "sentinel". In the pic I stole its marketed as an "anchor buddy" These are extra weights either attached to an anchor rode somewhere down low or lowered on a ring down along the rode. Help keep the pull horizontal.

look like this...

In place of these I have the ~8ft of 3/8" chain. That stuff is heavy. Right now my ~15ft of chain is about 15lbs total weight, as much as any anchor I'm likely to buy.
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