For our at anchor roll control devices we use a halyard which runs from a block at the end of t he boom, inboard to a rope clutch. The problem is that in bouncy anchorages the halyard sometimes slaps the boom, which is annoying.
We have gotten around this with a stopper knot at the block, but this has disadvantages.
Pete Rossin came up with a solution on FPB 64-3, Iron Lady, which we have adapted. This is a tweaker/twing line like are used on spinnaker sheets for quick adjustment.
We have simply run the halyard t hrough a block under th e boom which is attached to a pennant and pulls the halyard down enough so there is no slap when we are rolly achorages.
Posted by Steve Dashew (September 24, 2011)
September 24th, 2011 at 8:09 am
Hi Steve
We have made one more “adjustment” to this system. When in very rolly anchorages, the tweaker line would come up hard on the boarding gate stantion with a thud that could be heard thruout the boat. We are know securing the tweaker lines to the two manual winches adjacent to the house – no more thud. This also has the advantage of keeping the tweaker lines clear when maneuvering up and down the side decks to the aft deck.
Best
Pete
September 24th, 2011 at 10:11 am
Why not just run the halyard itself to the cleat that you are using to terminate the twing and eliminate the extra complexity?
— E
September 29th, 2011 at 4:54 pm
Howdy Eric:
The halyard runs along the book to a rope clutch. This way, regardless of boom angle, the tension, or length, stays the same.
In really rolling anchorages the flopper stoppers do not drop as quickly as the boom end does, which creates a slack along the boom. This is what slaps when it comes tight. There are probably other ways of rigging this gear that will come to light over time.
September 28th, 2011 at 3:54 pm
Hi Steve,
How big is the underwater plate?
Thanks,
Mike
September 29th, 2011 at 4:47 pm
Hi Mike:
Dimensions for the Magma roll control plates are below (from the Magma Marine website):
• Fully open 36” x 21” (91.5 cm x 53 cm) 756 square inches
resistance (4878 sq. cm).
• Folds flat for storage 10-1/2” x 36” x 3” (27 cm x 91.5 cm x 7.5 cm)
October 6th, 2011 at 8:30 am
Hi Steve,
Have you ever considered the Seakeeper gyro stabilizer system?
Electric power should be available while the engine is running, and this setup would do away with the drag of, and potential damage from, external stabilizer fins.
Cheers Lobo
October 6th, 2011 at 12:04 pm
Hi Lobo:
We have been watching gyros for many years. For a short time user, in certain sea states, they can make sense. But for us, the 2000 hours TBO is too short (and costly) and they do not (yet) match the range of conditions in which fin style stabs are functional. We keep watching, and hoping. It would be great to be rid of the external fins and hydraulics.