On Thu, 30 Oct 2008 10:54:20 +0700, Bruce in Bangkok
wrote:

On Wed, 29 Oct 2008 06:55:19 -0700 (PDT), Len
wrote:

Hi ng,

Normally I'm lurking but now I've got a question.
On our crossings we normally have a downwind course. When the wave's
come in at say between 120 and 160 degrees our boat tends to roll a 10
degrees over starboard and 10 degrees over port. What I do is getting
the weight as low as possible, even out as much as possible the sail
surface's at port and starbord, and sometimes steer another course. I
wonder if you are familiar with any further techniques I havent
thought of yet.
Any advice is welcome.

Thanks in advance,
Len, pa2q
www.svpresent.waarbenjij.nu

But basically without making major modification to the rig or boat
weight, high up, slows rolling -- to the extent that if carried to
excess it can cause capsizing.

Down wind sailing wing and wing promotes rolling as the wind force is
equal on both sides of the boat. Depending on the exact wind angle
sometimes having all sails on one side of the boat will give you get a
small angle of heel that cancels out some of the roll.

From experience, bilge keels help very little; towing parvanes slows
the boat about one knot and if you try them start slowly as there is
considerable force on the parvanes and if you roll enough to pull one
out of the water they can do real damage to boats and people, i.e.,
YOU. Never use rope or synthetic lines to tow the parvane. Cable or
chain only.

Of course, if you have fat pockets powered vanes work best but the
power boat guys tell me that you need to be going about seven knots
for them to have much effect.

The usual solution for us po' folks is to tack down wind :-)

Bruce-in-Bangkok
(correct Address is bpaige125atgmaildotcom)


Sorry, I missed. the first paragraph should have read:

You really need to talk to Roger as I believe he wrote an extensive
report on rolling and remedies some time ago. Perhaps you can search
the archives.

But.....

Bruce-in-Bangkok
(correct Address is bpaige125atgmaildotcom)

"Bruce in Bangkok" wrote

You really need to talk to Roger as I believe he wrote an extensive
report on rolling and remedies some time ago. Perhaps you can search
the archives.


Thanks, but that article was all about hull forms. If you think the
solution to reducing rolling is a new boat, give me a call. Otherwise, this
thread has about covered the solutions already.

--
Roger Long