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Old 20 October 2014, 13:16   #1
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Delta anchor sizing

had a great day spearfishing yesterday with the exception of no fish. Beautiful water, we could see the bottom in 75' of water.

But at the end of the day when my buddy pulled up the anchor there was no anchor at the end of the line!!?? we'd already changed out of dive gear and had drifted/motored from the anchor spot so finding it would have been iffy.

That being said I have a zodiac 7m. I had a 9lbs delta from the old boat. I have a mile of heavy chain and have never had a problem with the boat moving. Should I stick with the 9lb or step up to the 14lbs? Delta specs say the 9lbs is for boats up to 20', the 14lbs is 20-30'. the only problem with the bigger anchor is I am not sure if it will fit in the anchor locker that I made....

Thanks,
Jason
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Old 20 October 2014, 13:34   #2
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Are you diving off an unattended boat? If so I would go with the correct or larger sized anchor.

Curious if you carry a Nautilus Lifeline or a PLB with you while diving? (I carry a Nautilus in my drysuit pocket, but a PLB is on the shopping list.)
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Old 21 October 2014, 11:08   #3
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In general sizing recommendations are for hard boats. While a RIB may be lighter for a given length, it also has a much larger sail action than a hard boat. Go larger.

Out of curiosity, what failed to cause you to lose the anchor? Shackle come undone?

What kind of fish were you stalking? And where?

jky
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Old 21 October 2014, 11:53   #4
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Good point about sail area, I was thinking about the weight. no idea what happened to the anchor, I assume the shackle came loose, it was wired shut, but there was nothing but clean chain so no evidence. We were out at anacapa looking for yellowtail.

Peter, yes unattended boat. We are freediving and I don't have any locators or anything.
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Old 21 October 2014, 11:58   #5
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I'm planning on diving from my RIB unattended and went through a thought process that basically ended up with me buying the biggest anchor I could fit in the anchor locker

Oh, and about a mile of chain.

Perhaps someone nicked yours ?
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Old 21 October 2014, 12:30   #6
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Quote:
Originally Posted by Bigtalljv View Post
Peter, yes unattended boat. We are freediving and I don't have any locators or anything.
Well at least freediving you get to see your boat every couple of minutes. It is gonna be one heck of a swim challenge to keep up with a drifting boat in higher winds though.

Just out of curiousity do you ever scuba dive? Unfortunately due to a blown left ear drum 4 times (Wakeboarding injuries) I can not equalize fast enough on ascent. Descent is usually fine though. Screwing around with a K bottle of O2 I did manage an easy 3 minute breathe hold Cheating I know, but I was standing at least. If you are freediving to 75' that is impressive...as is the vis!
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Old 21 October 2014, 13:09   #7
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no, nobody else around to swipe it and I do have a mile of chain. that was one of the big considerations, the crew (generally wife and kids) has to haul this up.

I'll go with the bigger anchor. Hopefully it fits.



Yes, I do scuba dive but I much prefer freediving. Hunting on scuba feels very unsporting after freediving. No I can't freedive to 75', we could just see that far, part of the reason I didn't get suited up and go look for it. I can work 20-30' depths for long enough but I am by no means a great freediver but I still enjoy it tremendously.

So the the next question is anchor rigging. The delta and other plows you can shackle at the plow end and connect with a break away on the shank so if it gets stuck and you yank hard enough it self releases, or that's the theory. anybody rig theirs that way? what do you use on the shank end? zip tie or seizing wire?
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Old 21 October 2014, 13:29   #8
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I prefer to not have my anchor recoverable by breaking a zip tie and pulling from the back. In other words if it is stuck it will get left behind and possibly recovered later, or I will dive on it immediately to free it. To me it is more important to find my boat where I left it an hour later.

As to the shackle tie stainless wire is the best. Although I have a pink zip tie on mine that gets replaced often as I don't want the sharp wire cutting someone's hand.

If you are not using long freedive fins there is a whole new world waiting for you...
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Old 21 October 2014, 14:17   #9
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i've been freediving/spearfishing for 20+ years. It's not new to me. even still I just got a new set of heavy fiberglass blades, carbon and kevlar cost too much and aren't stiff enough, I'm a big fella. I dove on them for 5 or 6 hours sunday until my calves started to cramp up
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Old 21 October 2014, 14:23   #10
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I don't shackle tie mine. The last thing I want is the wind veering, the zip-tie breaking and the anchor dragging backwards

If it gets really stuck I will either dive to free it, tie off a fender and come back later, or cut it free.

I use a claw, the delta is too pricey to lose IMO.
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