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Forum archive >> Back to basics Channel crossing
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qsiv
regular


Reged: 30/09/2002
Posts: 1690
Loc: Channel Islands
Minimum Tech
      #489264 - 19/03/2004 09:10

But theres nothing here .... yet!


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Jimi
regular


Reged: 19/12/2001
Posts: 16079
Re: Minimum Tech [Re: qsiv]
      #489267 - 19/03/2004 09:13

Who said that ... Celia?
I Have The Body Of A God... Buddha

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tome
regular


Reged: 28/03/2002
Posts: 8202
Loc: kprick
Re: Minimum Tech [Re: qsiv]
      #489268 - 19/03/2004 09:15

A blank canvass!

Picking up the thread, propose (subject to discussion/agreement):

- Departure from Needles or Bembridge ledge
- Destination Cherbourg
- Goal: Minimum logged miles v rhumb line distance
- No use of PC or modern aids for passage planning
- No use of GPS or electronic navaids for crossing
- Echo sounder and log permitted
- Radar permitted for CA only
- No engine (unless becalmed?)

Count Amaya in! Dates to be decided. Should we make it neaps or tatties?

Edited by tome on 19/03/2004 09:21 (server time).

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qsiv
regular


Reged: 30/09/2002
Posts: 1690
Loc: Channel Islands
Re: Minimum Tech [Re: tome]
      #489274 - 19/03/2004 09:21

I'd beg to differ on one of the objectives ..

I dont think distance v log is relevant - all one really needs is arrival closest to planned arival time.

The shortest duration crossing may very well NOT be the shortest distance.

The only complication here of course is boats quoting a later arrival target, and jilling around to kill time - but then that's what rally crews have to do, so maybe it is valid.


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tome
regular


Reged: 28/03/2002
Posts: 8202
Loc: kprick
Re: Minimum Tech [Re: qsiv]
      #489282 - 19/03/2004 09:33

Ok Iain, no problem with this.

When do we announce our arrival time? I suspect (like last time) that boats will leave at different times depending on crew commitments etc so not feasible to say be in Cherbourg at 6pm Saturday or whatever.

I'd prefer to call SWMBO or a nominated contact at Bembridge and for them to post my ETA.


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bedouin
regular


Reged: 16/05/2001
Posts: 3431
Re: Minimum Tech [Re: qsiv]
      #489314 - 19/03/2004 10:00

Trouble is I can pretty well guarantee arrival time by allowing plenty of spare time then wasting it all within sight of the entrance.

Also arrival time will be very heavily dependent on wind / weather which can be difficult to predict in advance


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tome
regular


Reged: 28/03/2002
Posts: 8202
Loc: kprick
Re: Minimum Tech [Re: bedouin]
      #489365 - 19/03/2004 11:19

How about predicted v actual distance?


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bedouin
regular


Reged: 16/05/2001
Posts: 3431
Re: Minimum Tech [Re: tome]
      #489369 - 19/03/2004 11:27

I'm going to be difficult here :(

How would you measure actual distance? The problem is that the expected accuracy of the log (or mine at least) is much less than the sort of differences in distance. So for example a 10 degree error in course only represents a 2% increase in distance - and my log is not that accurate


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Jimi
regular


Reged: 19/12/2001
Posts: 16079
Re: Minimum Tech [Re: bedouin]
      #489377 - 19/03/2004 11:33

Think its actually quite easy .. if you end up in Cherbourg its a tick,St Vaast or alderney .. soso .. StPP .. could be worse ... Corunna .. better luck next time Ft Lauderdale .. hope you've got a watermaker Brian!
I Have The Body Of A God... Buddha

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tome
regular


Reged: 28/03/2002
Posts: 8202
Loc: kprick
Re: Minimum Tech [Re: bedouin]
      #489389 - 19/03/2004 11:40

That's the point - could you predict the actual log reading, given that you would (of course) know the error?


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