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From: Matt Broze <mkayaks_at_oz.net>
subject: [Paddlewise] Reading currents
Date: Wed, 20 Apr 2005 19:19:15 -0700
Black Coffee 2002 wrote:
<Snip>>>>>>> I ended up paddling only using my northwest-side
paddle just in order to stay on straight course to my target.

So my hypothesis is that the current was moving from southeast to northwest
through this small channel.  The wind happened to be blowing the opposite
way, which generate a bit of chop, and apparent wave flow, but the
overriding dynamic was the current or tidal flow through this channel.
<<<<<<Snip>

>From this snippet of your e-mail I think there was more going on here than
just a current. You give no indication in the e-mail that confirms the
existence of an actual current and you wouldn't need one to experience just
what you did describe. The tip-off is that you had to paddle only on one
side to stay on course. A current alone would not make you have to do that.
It would just drift you evenly sideways (except when you were crossing an
eddyline in which case you would be turned once each time your bow crossed
into a place where the local current direction had changed). In the main
current you would be drifted sideways some but would only have to correct
for the current once and then paddle evenly on each side toward your
destination. I think you will find the same thing you described happening
when you paddle across a side wind on a lake (where there is no possibility
of much current).

I'm going to guess your kayak had no rudder (or if it did you weren't using
it). The next time this weathercocking (or weather helm) happens to you, try
stopping and then paddling backwards across the same wind for a bit. Notice
that then your stern is now the end of the kayak that is constantly turning
up into the wind. Putting this simply, whichever end of the kayak is
experiencing the lesser pressure (the end opposite the end that is pushing
the water apart) is being blown downwind more than the end that is towards
the direction you are moving. This "weather helm" effect is constant as long
as you are moving across the wind so it must be constantly (or at least very
regularly) compensated for.

For a much more detailed discussion of weathercocking read the "Paddling"
manual in the "Manuals" pick-box on our website (below). If you had been
using a rudder you would probably have compensated for weathercocking
without realizing you were now dragging the rudder along at an angle and it
was slowing you down to make that constant correction. There are other
devices and techniques (and kayak hull design factors) that can be used to
compensate for weather helm besides a rudder. Again I'd refer you to the
"Paddling" manual and website for more details.

To check for side current line up two landmarks (one behind the other) that
you are paddling directly towards and see if they stay lined up or if you
are being drifted to one side or the other so they get out of line.

Matt Broze
www.marinerkayaks.com
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