Ok here's a quick review of our thoughts on the Kobra II
I really like our Kobra II . Our cat is 12m x 7.3m 11T with a lot of windage (read: condomaran) 2m high freeboard etc. the factory supplied a 20kg delta
, which we had and used on our last cat without problems. It was a good anchor for our 11.6m 8T cat but I wanted a bit bigger for this cat, so we went with a 25kg Kobra 2. If fits the bow roller neatly and construction is solid. We have used this anchor full time for over a year and probably anchored 90% of the time. We have anchored in sand, mud, shale, shells, weed, sand with rock, limestone with sand over, and so far it has set within 1m of the drop and held fast on all but one occasion. The one time it didn't set immediately was in soft mud and I slowly dragged it for 20m while reversing with 2 engines at 2200RPM before pulling it up and resetting it. Next time I reversed a bit slower to allow it to sink in. It generally sets like a rock and no amount of reverse revs will budge it.
We always use an anchor alarm
with minimum radius set, and I also place a waypoint when setting it while the engines are in reverse at around 2200RPM and watch the waypoint/vessel while setting to gauge any movement. After a minute of that we are confident the anchor is set and I usually dive on it to confirm it's not fouled on a rock or anything. Without using an anchor alarm
, it's hard to know if the anchor has dragged a few meters and reset, or slowly dragged, but the anchor alarm gives very good visual reference as to the swing and I would see even the slightest drag of 5m in that case.
The Kobra looks very similar in design to the delta
and I'm not sure why it performed so much better in the anchor test linked above, or why one is called a spade type and the other a plough type.
We always like to have close to 5:1 scope
but it's not always practical or possible and occasionally we reduce it to 3:1. There have been quite a few occasions where we have had 3:1 scope
with steady 30K + wind
and the Kobra held fast every time.
On one occasion with 3:1 scope we had 30K steady, gusting to 35K on light sand over limestone which I wasn't very confident with. The wind
direction had changed 180 degrees and was blowing us onto a rocky lee shore, with 1m wind waves. We tried to let out more scope as all but one of the other yachts had left the anchorage, but found it too difficult to motor
forward enough to reset the bridle
. I was impressed but sat at the helm
for 4hrs or so, watching the waypoint and ready to start the engines and up anchor, but there was no need. The wind eventually dropped to around 20K and we changed to 5:1 scope.
The Kobra handles wind direction changes easily enough. I've never seen it break out or reset, it just turns and stays buried. We've been through quite a few 180 and 360 degree wind changes.
Ive taken a few photos along ten way of the various sets and added them to noŽlex's 'photos of anchors setting' thread, so you can take a look there if interested and there's a lot of good anchoring
information on that thread as well. Generally all my photos look pretty much the same, with just the shank on the seabed. When raising it turns well on the bow roller and settles in place without much effort.
Well there's really nothing I can complain about with the Kobra II, except maybe the price
. It's cheap
, and if you're the kind of guy that likes to show off his shiny stainless ultra or similar while bow to at the dock
, the Kobra might not be for you. It's not a $1000 anchor, it's probably not even a $250 anchor ( we bought ours used in La Rochelle for about $150 )
Well, it's an anchor, hardly beautiful. Functional, practical and it works like a bought one