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Conference unifix::sailing

Title:SAILING
Notice:Please read Note 2.* before participating in this conference
Moderator:UNIFIX::BERENS
Created:Wed Jul 01 1992
Last Modified:Mon Jun 02 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:2299
Total number of notes:20724

1529.0. "Current Info for Marblehead?" by STAR::PROULX () Fri Jun 08 1990 22:15

    Does anyone know of a detailed source of tidal current data for the
    area around Marblehead Harbor?
    
    I race there Wednesday Evenings and have twice during the past
    several seasons drifted into the mark at Tinker's Rock or Volunteer
    Rock in light air.  I'd really like to know what's going on.
    
    I'm thinking of taking my pickup buoy out on a quiet day and doing my
    own survey by dropping it next to various marks at various stages of
    the tide and seeing where it goes and how fast, but that could be
    terribly time-consuming.  Has anyone invented this particular wheel
    before?
    
    The MHRA hands out advice on local currents to out-of-town race
    participants, but it seems inconsistent and contradictory.  I sometimes
    think they're just trying to confuse the visitors!  About the only part
    of it that I believe is tha loal currents are "tricky".
    
    - Jean
T.RTitleUserPersonal
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1529.1MFGMEM::KEENANPAUL KEENAN DTN 297-7332Mon Jun 11 1990 10:1511
    There are tide charts available, some are more detailed than others.
    Contact a good chart store. Down here in RI, the URI School of
    Oceanography generated extremely detailed tidal charts for this area.
    Something like this may be available for you.
    
    Some racers use something called a tide stick. It's about 3'-4' long,
    painted orange, and weighted at one end. You drop it near a bouy and time
    how long it takes to move a boat length or two. Its length makes it easy to
    retreive.
    
    Paul
1529.2Here's What I've Been ToldSTEREO::HOMon Jun 11 1990 10:2723
    I ask this question all the time.  The answer that is usually given
    (other than "beats the h**l outa me!") is that the current pretty
    consistently flows from southwest to northeast along the coast.  A
    flood tide perturbs this in towards M'hd channel (roughly northwest)
    and an ebb tide does the opposite.   The area aroung Tinkers is
    usually a bit of a problem because the shallows cause eddies that
    further perturb the local current.  
    
    Soooo, given the above, what's the most deadly combination of wind and
    tide conditions for the typical bearcan race?  How about a 3 knot dying
    SW breeze in a flooding tide with a the last leg of the race a beat
    from the M'hd bell to the finish at Tinker's.  Now you're bucking tide,
    wind, and current.  Through in a full moon tide and a few six packs
    consumed by the crew and there'll some fun tacking to the finish. 
    Needless to say, forget the conventional wisdom about laylines and
    overstanding.  You'll have to overstand almost to the point of having
    the mark behind you before the final tack.  Then fall down on the mark,
    turning up at the last second to finish.  Generally there is more room
    and less current if you do this on the side away from the shore.  This
    is one of the few instances when being the lead boat is not what you
    want.  Let the guy in front be your real time current stick.
    
    - gene