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Old 29-09-2014, 12:35   #1
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New Rocna

The details of the new non roll bar Rocna are out.

http://www.actionhub.com/pr/2014/09/...14-boat-shows/

A cross between an Ultra and a Spade? Hopefully the best features of both. I like the tapered leading edge of the shank, but it looks like maybe a machined solid shank?. A very streamlined ballast chamber.

The most important question what does my mermaid think?
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Old 29-09-2014, 12:50   #2
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Re: New Rocna

The "roll palm" looks like an old tractor seat.
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Old 29-09-2014, 13:16   #3
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Re: New Rocna

The press release says this:

"self-rights the anchor on the seabed without the use of either a roll-bar or a large mass of inefficient tip ballast"

What is "inefficient" about tip ballast? Is it just cost or is there some other measure of efficiency.

I agree that the shank looks like it will cut through stuff better than a flat plate section shank. And it looks like it can probably be easily re-galvanized which would be a plus.

The welding of the shank to the "tractor seat" looks interesting in that it isn't clear what happens at the toe end of the shank-seat interface.
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Old 29-09-2014, 13:32   #4
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Re: New Rocna

Quote:
Originally Posted by transmitterdan View Post

What is "inefficient" about tip ballast? Is it just cost or is there some other measure of efficiency.
Mass in the tip makes the tip thicker which reduces penetration especially in weed and hard substrates. Ballast weight also means the fluke area must be smaller for the same overall weight of anchor.

There have been two very successful designs of anchors.

1.The concave roll bar anchors that use the roll bar to orient themselves correctly. They only have a small amount of tip weight which makes the tip very streamlined and able to penetrate easily, but they need a roll bar.

2.Anchors like the Spade that use a ballast chamber to orient the anchor correctly. This makes the tip much thicker, but no roll bar is needed.

There are many other ways to design anchors, but the above two approaches have been the most successful general purpose anchors (so far) in my view.

The traditional Rocna falls into the first category and the new anchor the second. Importantly the new anchor will fit boats that cannot accommodate a roll bar on the bow.
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Old 29-09-2014, 13:40   #5
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Re: New Rocna

At first glance it looks like a Spade, but it has the potential to be a winner if it is more available (especially in the US) and reasonably priced than the Spade.
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Old 29-09-2014, 13:52   #6
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Re: New Rocna

Spade was my first choice when I was new gen anchor hunting, but couldn't buy it in the USA. Still, very happy with my choice of Manson Supreme.
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Old 29-09-2014, 13:56   #7
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Re: New Rocna

Quote:
Originally Posted by noelex 77 View Post
1.The concave roll bar anchors that use the roll bar to orient themselves correctly. They only have a small amount of tip weight which makes the tip very streamlined and able to penetrate easily, but they need a roll bar.

2.Anchors like the Spade that use a ballast chamber to orient the anchor correctly. This makes the tip much thicker, but no roll bar is needed.

The traditional Rocna falls into the first category and the new anchor the second.
My understanding was as this new "tractor-seat-anchor" is of no rollbar-no ballast construction.
Was I wrong?

Tomasz
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Old 29-09-2014, 14:17   #8
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Re: New Rocna

that baby is going to bring some mud up with it I bet
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Old 29-09-2014, 14:23   #9
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Re: New Rocna

Quote:
Originally Posted by DoubleWhisky View Post
My understanding was as this new "tractor-seat-anchor" is of no rollbar-no ballast construction.
Was I wrong?
Yes I expected something like the Manson Boss which is a non ballasted non roll bar concave anchor.

This looks like it has a ballast chamber, although it may be steel rather than lead. It appears a bit smaller and streamlined than the Spade but I suspect the ballast has a major role in orientating the anchor like the Spade and Ultra.

This is unlike the Manson Boss and previous Raya, Océane, Sword etc that relied primarily on geometry to achieve their correct setting position.
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Old 29-09-2014, 14:36   #10
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Re: New Rocna

Quote:
Originally Posted by sailorboy1 View Post
that baby is going to bring some mud up with it I bet
I think it can be even more than old simple rollbar designs
But... Is it the biggest possible drawback of anchor design?
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Old 29-09-2014, 15:40   #11
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Re: New Rocna

Quote:
Originally Posted by sailorboy1 View Post
that baby is going to bring some mud up with it I bet

My current roll bar Rocna is good at that, thankfully I have a long bowsprit that allows me to troll with my anchor until the mud is gone
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Old 29-09-2014, 16:28   #12
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Re: New Rocna

Quote:
Originally Posted by DoubleWhisky View Post
But... Is it the biggest possible drawback of anchor design?
Not some sort of fisherman. I'm surprised that there is not one like the fishermen around San Francisco use, sold in stores. Not very yachtie I guess.
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Old 30-09-2014, 00:14   #13
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Re: New Rocna

So, the burning question: What kind of steel is used in the shank?

Enquiring Rocna bashers want to know!

Jim
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Old 30-09-2014, 01:08   #14
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Re: New Rocna

Unsurprisingly, the new Rocna is as pictured in Figures 6, 7, and 8 (i.e. the 'second preferred embodiment') on page 3 of the diagrams on Peter Kevin Smith's 2013 US patent (also patented in Canada as CA2790598A1).

See the patent at: https://www.google.com/patents/US20130068152.

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Old 30-09-2014, 01:37   #15
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Re: New Rocna

Interesting. Thanks for the link.

It seems strange to me that they are applying for a patent partially for a shank with a sharpened leading edge. This is a good idea and I am surprised it is not used more, but to try and patent it?

It has been used on anchors for a long time. The original Delta had a shank like this as did the Bruce.

Sometimes I think I should file a patent:
I have combined two hydrogen atoms together with an oxygen model in a special arrangement. The three atoms make an angle; the H-O-H angle is approximately 104.5 degrees. The centre of each hydrogen atom is approximately 0.0957 nm from the centre of the oxygen atom.

I call it "water".

Should make me rich .
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