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    Re: Wind & Current Navigation
    From: Fred Hebard
    Date: 2003 Apr 21, 21:46 -0400

    Regarding Jared Sherman's comment, I believe some of the old
    (1960s-era) British sub-chasers (called frigates?) could almost pivot
    about themselves, fairly rapidly, by reversing one screw and keeping
    the other going forward, perhaps also with way on.  Speculating,
    perhaps they had independently steerable twin rudders, or even extras
    forward of the screws.  Perhaps some of the fellows with shipboard or
    engineering (physics) experience can enlighten us.
    This whole topic of marina navigation is a new one for me.  It very
    clearly needs careful contemplation!  In the old days (1960s!), many
    harbors were less crowded and boats on single moorings.  Much easier to
    slip on or off than a pier, especially one that is approached head on
    or stern first after a 90-degree turn.  No effect of the pier and
    neighboring boats blocking the current.  I think life also was easier
    then because many boats had no motors, so no prop walk in reverse.
    Although I remember one fellow, for some odd reason, hoisting all sail
    on a 72' ketch when pointed out harbor with a nice 15-20 knot breeze
    also blowing that way, and a bit away from the dock.  About ripped the
    dock off.  Now that 72 footer did have a motor.
    Fred Hebard

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