NavList:
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Re: Leg 46
From: Dan Hogan
Date: 1999 Feb 07, 21:37 EST
From: Dan Hogan
Date: 1999 Feb 07, 21:37 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" =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-= =-= TO UNSUBSCRIBE, send this message to majordomo@XXX.XXX: =-= =-= navigation =-= =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=