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    Re: DR thread from Nov-Dec '04
    From: Doug Royer
    Date: 2005 Jan 18, 10:36 -0800

    After reading my origonal post on this subject I noticed I wrote the set
    discription incorrectly.I appologise for any confusion I caused and will
    clear it up now.
    If the wind is out of the north at 360 * T the set will be in the direction
    of 180 * T.If the wind is on the starboard beam the resulting current will
    push the vessel toward the south.That issue now being corrected the set of
    the wind driven current will be in the direction of 220 * T,not 320 * T.
    Again, 360 *T - 180 * T = 180 * T. 180* T + 40 *(to the right of the wind
    direction)= 220 * T.
    Don't let my mistake deminish the importance of this effect.
    
    
    Doug
    
    > When engaged in commerce shipping time is money and
    > money is time.
    
    I also imagine it takes more than pocket change in fuel for those few extra
    miles as well. Must make a cigarette boat look like a hybrid economy car ;-)
    Do you have a ball-park figure for gallons per mile for an average loaded
    freighter?
    
    The larger,older freighters use bunker oil for propusion.Some of the newer
    vessels use gas turbine technology but the majority use diesel.The
    nomenclature for fuel cunsumption in these vessels is in barrels/hour for a
    given rpm of the shaft.I believe there are 42 gallons/barrel.A vessel of
    this size can easily consume 100s of barrels/day depending on speed,draft
    and sea conditions.I'll get an example of this tonight and post it tomorrow.
    
    > "The Merchant Marine Officer's Handbook" 4th or 5th edition devotes space
    to
    > it in the chapters dealing with shiphandling and pilotting. I haven't seen
    a
    > 6th edition yet.
    >
    > Other than that one book perhaps in other marine teaching institution's
    > sylabus as that is where I was 1st exposed to it.
    
    I first noticed it in the Annapolis Book of Seamanship, and then aware of
    it, noticed it in a a couple of other texts.  Memory fails, but I would
    guess Dutton's, Chapman, and Bowditch would be rounded up as the usual
    suspects for a line up.
    
    I'll look at my older editions of Dutton's and Bowditch tonight and see if I
    can find referance to this in them.I don't remember it being in Dutton's but
    it's been awhile since I dusted my copy off.
    What is the "Annapolis Book of Seamanship" ? Is it a book used to teach
    midshipmen or cadets at the Naval Academy?
    
    
    Bill
    
    
    

       
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