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Subject: RE: [Nml] Leg 46
From: Dan Hogan (dhhogan@XXX.XXX)
Date: Sun Feb 07 1999 - 21:37:25 EST
Hi Millard glad to see you back. You've been one of the steady
contributors to Silicon Sea.
> 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
If there are two answers alike I am going to be very surprised. Foe tid
long a distance a lot of differences will creep in depending on
technique and method used.
>
> 14,112.2 divided by average speed of 8.4 kts yields 1680.0238 hours
> that divided by 24 gave 70.000992 hours.
Any way you find doing the calculation say is fine . Because it fits in
with other navigation problems I use "Daily distance = Speed in Kts x
24Hrs(one day)". Then divide that into the total distance.
> 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. :-)
It's only a planning exercise. But there ain't a lot of beer stops
between Wellington and Cape Horn ;^(
Dan Hogan WA6PBY
dhhogan@XXX.XXX
Catalina 27 "GACHA"
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