Rick:
Fouling is a significant enough
issue on all voyaging boats as to warrant developing a good
strategy for dealing with it effectively. In the current
reenactment if that is the word, of the famous Golden Globe Race
of 50 years ago, the competitors are spread across about 6000
miles of ocean, the spread being at least partly due to fouling
with goosneck barnacles &c. The lead boat, in addition to
being sailed by a man with many years of sailing in those
conditions, also applied a final hard coating of bottom paint to
which he added a great deal of copper powder, which has proven far
more effective than the current crop of antifouling paints which
are not preventing growth, though the course is largely in the sub
arctic waters of the 40's.
No multihulls were allowed to
participate, though there were a number of them in the '68 race.
It would seem to me that the shallow draft of a multihull would be
a big advantage here, as a lot of scrubbing would be possible from
an RIB or whatever without personally entering the water. A
number of the competitors have taken advantage of being becalmed
to scrub their hulls.
H.W.
On 10/30/18 5:36 PM, Rick Willoughby
rickwill@bigpond.net.au [harryproa] wrote:
As I have noted before, hull cleanliness is a more significant factor with multihulls compared with monohulls. A fouled monohull with deep keel will still point high enough to tack if fouled. Older style IOR deep keeler would almost turn in their own length so do not need much momentum to complete a tack.
A cat that has sails and appendages that enables it to point higher than 40 degrees and still sail should tack OK without motoring and with jib self tacking. However it does not take much fouling to really knock pointing ability.
It is a useful exercise to look at the track of successive upwind tacks on a GPS. If they are within 90 degrees without current assist then that is good for a multihull.
On 31 Oct 2018, at 1:54 am, ryanonthebeach@gmail.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
Guity here
I would often motor through a tack with my old heavenly twins and she had an extreme amount of rocker.It was possible to tack without the motor of course, especially when b ackwarding the jib, but not easy in light airI assume this is because of lack of rig efficiency, weight, keels etc.?
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Posted by: StoneTool <owly@ttc-cmc.net>
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