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    Re: Leg 46
    From: Kevin Redden
    Date: 1999 Feb 07, 14:56 EST

    Millard,
    Thanks for the reply. As to the proper spelling of the straight line between
    two points - you're asking the wrong person! I can talk about navigation,
    but when it comes to speellingg, thank God for spell checkers. I do know
    about the spelling for the Rum line (the queue for drinks at the bar).  :-)
    I do have a question about your answer for sunrise in question seven. Using
    the Celesticomp, I get your answer for 18 Feb in Sydney, not for 17 Feb. The
    Celesticomp calls for GMT times when using the sunrise program, and when you
    are looking for sunrise in Australia on 17 Feb, it is still 16 Feb in
    Greenwich. Are you sure of your time for question 7? Am I doing it wrong
    here?
    Kevin
    -----Original Message-----
    From:	Millard Kirk [mailto:mkirk{at}XXX.XXX]
    Sent:	Sunday, February 07, 1999 2:10 PM
    To:	Navigation
    Cc:	Kevin Redden
    Subject:	RE: [Nml] Leg 46
    The answer of 70 days for problem #2 was arrived by the following method:
    The rhumb line each leg was determined.
    Planning Routes--Port Jackson to Boston
    Port Jackson(Sydney) Departure--33d 50.8'S  151d 18.0'E
    Tasman Sea Waypoint 1-----------34d 00.0'S  151d  40.0'E        20.5 nm
    Tasman Sea Waypoint 2-----------38d 40.0'S  166d  45.0'E      783.5 nm
    Destination N of Stephens Is.---40d 50.0'S  174d 00.0'E          360.0 nm
    Wellington Departure Point------41d 30.0'E  175d 20.0'E            72.4 nm
    Cape Horn-----------------------56d 04.0'S   67d 15.0'             4692  nm
    WPort Stanley, Falkland Is.------51d 40.0'S   57d 40.0'W          430  nm
    Mid-Atlantic Waypoint-----------00d 00.0'N   23d 00.0'W      3576.6 nm
    Barbados------------------------13d 10.0'N   59d 20.0'W          2314.2  nm
    Cape Cod------------------------42d 10.0'N   70d 00.0'W	        1827.9  nm
    Boston--------------------------42d 20.0'N   70d 46.0'W              35.6 nm
    Total    14,112.2 nm
    14,112.2 divided by average speed of 8.4 kts  yields 1680.0238 hours
    that divided by 24 gave 70.000992 hours.
    This answer is based on sailing time only and I did the problem as I thought
    it was presented.  This in my opinion would only be estimate of distance and
    time for planning.  I would assume the longer legs one might sail the great
    circle, but I did not read the problem in that context.  On the other hand
    the sailing of each leg might be longer due to winds and currents, and
    therefore the overall distance may even be longer. I would assume one would
    stop at some of these way points.  I know if I sailed approximately 4700
    miles I would like to get off the boat for a moment for a little rum or
    beer.   :-)
    By the way which is the correct spelling of "rumbline" , "rumb line", or
    "rhumb line". My spell checker on my email does not recognize any of them.
    My dictionary says "rhumb line".  Now I am not being picky.  I am a terrible
    speller, among other thing.
    Thanks for the comments.
    -----Original Message-----
    From: Kevin Redden [mailto:kredden{at}XXX.XXX]
    Sent: Sunday, February 07, 1999 1:29 PM
    To: owner-navigation{at}XXX.XXX
    Cc: Millard Kirk
    Subject: RE: [Nml] Leg 46
    After seeing the Silicon Sea cruises for the past two years, I finally
    decided to start working the problems. I'm planning on trying to do a long,
    celestial-only cruise this year, and I need to brush up on my practice.
    I was puzzled by Answer #2. The 70 days given would only be correct if you
    sailed rumb line courses for the whole trip. The problem is that nobody in
    their right mind would do this! The rumb line distance of 14,112.7 nm is
    586.9 nm longer then the Great Circle distance of 13,525.8 nm.
    By sailing the legs (other then the departure/arrival legs) using Great
    Circle courses, the time required is almost 3 days shorter (67.1 days). Of
    course, nobody figured in the time spent on sampling the rum and sobering up
    again during the obligatory stop in Barbados!    :-)
     Why was 70 days given as the answer to #2?
    Kevin Redden
    Westfield, N.J.
    -----Original Message-----
    From:	owner-navigation{at}XXX.XXX
    [mailto:owner-navigation{at}XXX.XXX] On Behalf Of Millard Kirk
    Sent:	Saturday, February 06, 1999 7:29 PM
    To:	Navigation
    Subject:	[Nml] Leg 46
    Answers to Leg 46
    1.)	Ans. 14,112.7 nm
    2.)	Ans. 70 days
    3.)	Ans. 1530 lbs
    4.)	Ans. 13.75 days
    5.)	Ans. 	TC   111.1 d
                    Dist 1164.1 nm
    6.)	Ans.	TC    117.8d
                    Dist. 1156.9 nm
    7.)	Ans.    ZT   05:31:39
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