Collision at anchor

[jasonr575]

The motor doesnt over heat from backing down the anchor but if it run it for 20 min at over 2000rpm it gets warm. I am saying i bring it up to 1500rpms and hold it there for a short while. i dont however like sailingdog put it in full reverse hard and have people falling off the bow. Thanks for the info guys, may be i was too gentle.

[sailingdog]

Jason-

I don't back down at full reverse... it is just that the Rocna sets that hard and quickly. If you've never used one... you wouldn't understand.

[jasonr575]

Sailingdog if you are telling the truth i am considering modifying my bow sprit to accomidate one. i will check it out this week and see if it can be done.

[sailingdog]

Jason-

Several others on this forum, like Halekai36 and Joesaila have them... They'll back me on this. Also, the Rocna is built like a tank... and they're a lot more reasonable to purchase if you don't have to pay freight charges on them, like I did. WM now can special order them for you, most don't stock them yet.

My reasoning for getting a Rocna is pretty simple. I wanted to have a primary anchor for my boat that would be able to hold it through storm conditions if necessary. Rather than having to screw around with multiple anchors or tandem anchor setups or carry a special "storm" anchor, I just wanted to have a primary that works.

Yes, breaking the Rocna out takes a bit more effort, but overall I see it as a time-saver. How many times did you have to haul and drop the anchor because it didn't set properly and you were sure you were going to drag. I'd rather have to spend a few more minutes using the boat to break out the Rocna at my convenience, than spend an extra 30 minutes trying to get a different anchor trying to set.

I do have three anchors for my boat. The Rocna 15 lives on the bow roller and is ready to go at a moment's notice. A Delta 22 is going to be coming on as soon as I get around to splicing the new rode for the Rocna. This will be my secondary, and back up anchor. The last is a 13 lb. Danforth, which will be a stern anchor and ocassional lunch hook.

A more in-depth discussion of my choice of the Rocna is on my blog.

[donradclife]

Its possible to make an anchor like a Rocna fit your existing bow by welding a 4 inch long piece of 3/4" pipe to the bottom of the shank at a 45 degree angle. The pipe gets wedged under the bow roller and holds the anchor out in front of the boat. The anchor is then self-launching and, with a bit of tension on the chain, is so well captured that you don't need to lash it down on passages.

Its a bit hard to describe and a picture would be a big help, but the anchor is currently on the bottom and I'm not very good at posting photos...

[sailingdog]

Don-

Why would you bother doing that. The Rocna fits just fine on the bow roller I have.

[jasonr575]

Well we dont all have the same roller you do sail dog.
Don Thanks for the advice, Interesting idea. i would really apprecaite viewing a pic of it when you haul it up. if easier i would be glad to give you my email or even take a pic with your phone and send it to me if you have that ability with your service.

[KeelHaulin]

To the OP; Aquatic park is a pretty small anchorage. In addition it does have tidal flow which is enough to make the boat change direction but probably but not enough flow to cause your to re-set (in most situations). The problem with anchoring in the park is that the mooring field is nearly full with Sea Scout boats and around the perimiter there is not much room between the breakwater and the mooring field. IMHO it's a tight anchorage. We do also anchor there for overnignt trips; last time we were there on Labor Day weekend we dropped the hook and then realized that we were too close to another boat on anchor. So we picked up and moved to another spot that was further toward the enterance. Then another boat came in during the night and anchored right next to us; too close IMHO but we never bumped. I like a minimum of 5:1 ratio on our scope; but if the wind is light I use less to keep the swing radius down. At 5:1 that's appx 75' of line with a 41' boat which makes my radius somewhere near 120'. That's approaching a football field sized circle; and not too many of those circles will fit around the perimiter of the mooring field there...

[Craig Smith]

Ah most of the necessary points have been made in this thread already, but just to reiterate a few things -

Scope:
Anything much over 8:1 is largely pointless, the maximum possible angle of pull on the anchor at this geometry is just over 7 degrees, and of course the scope must be doubled to halve the angle. In other words, even large increases in scope beyond this 'sweet spot' do not appreciably benefit the anchor. So, those using 10:1 and above are a little naive about what is happening under the water, and the likes of Don R. are quite justified in getting upset as swinging circles larger than necessary are selfish.

By the way, I would hesitate to challenge Don's opinion when he states it - I would be willing to wager than Don and Katy have more varied experience than most out there (and on here).

Sentinels (kellets):
Pointless w.r.t. improving anchor performance, been discussed a hundred times before, but here's the article...
Kellets, uses and misconceptions
EDIT CAM ...AGAIN YOU MAY NOT PROMOTE YOUR ANCHORS OR DISPARAGE OTHERS HERE AND MAY ONLY RESPOND TO A SPECIFIC INFORMATION REQUEST WHEN DISCUSSING YOUR ANCHORS.
As to the Rocna and a roller solution, if we can be of any assistance just send us an e-mail.