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Old Timer View Drop Down
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    Posted: 29 Sep 17 at 5:52pm
Originally posted by mozzy

Originally posted by davidyacht

I can feel some leebow effect discussion coming on ...

I see iGRF is a big proponent of the tidal 'lee bow effect' from other threads. Which says all you need to know. 



Indeed ...  LOL
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Posts: 370 		Post Options Post Options   Quote Old Timer Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 17 at 5:51pm
Originally posted by iGRF

And if it's a cross tide?Say 3 knots in a 7 knot wind?

The pathfinder on port with the tide on it's weather bow and by starting early you get the tide on your lee bow with the associated combination of apparent wind (10 knots)with the fleet stationary being fed by a pathfinder boat (4 knots) ?

Oh no ... this is another version of the iGRF lee-bow theory ...

It will only make a difference if the tide is not even over the whole course ... 
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Posts: 714 		Post Options Post Options   Quote GarethT Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 17 at 5:32pm
But I think the semantics of this thread equally applies to the lee-bow argument.
For tide uniform across the course, it's probably not an issue, but get it on the Lee bow where it' strongest?

*dons tin hat*
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 17 at 4:36pm
Originally posted by davidyacht

I can feel some leebow effect discussion coming on ...

I see iGRF is a big proponent of the tidal 'lee bow effect' from other threads. Which says all you need to know. 
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Posts: 310 		Post Options Post Options   Quote Gordon 1430 Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 17 at 4:33pm
Well Mike Holt and Carl Smit must have had it sorted, well done guys.
Especially Mike who posts on here and originates from Essex, and still sounds like it in most interviews.
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 17 at 4:22pm
Originally posted by JimC

Originally posted by mozzy

Not sure I understand GRFi's "if tide is favourable, start early". If it's favourable, then it's favourable for everyone, and the pathfinder will be being swept upwind just as quickly as the early starters... 

Well, that does presuppose the tide is constant across the course, which at most venues seems unlikely. If the tide is better on the left you don't want to start late and thus right.

Yeah, which is why I started my post:

Originally posted by mozzy

If you want to go left, start early. If you want to go right, start late. (persistent shift, topography, tidal difference across course; all the usual stuff).
 

What iGRF didn't make clear was that by favourable, he meant favourable in a particular place: the left. Because, if the tide is favourable on the right, you'd want to start late. But if the tide is just generally favourable across the course, then it makes no difference. 

(People say 'favourable tide' when it is just running the direction you are going and will interchange 'wind against tide' with 'a favourable tide on the beat' or 'tide in your favour on upwind').
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 17 at 4:12pm
Originally posted by iGRF

And if it's a cross tide?Say 3 knots in a 7 knot wind?

The pathfinder on port with the tide on it's weather bow and by starting early you get the tide on your lee bow with the associated combination of apparent wind (10 knots)with the fleet stationary being fed by a pathfinder boat (4 knots) ?

This kind of sounds like you're about to say something stupid, which is going to be ironic given your last post about knowing all there is to know about racing in tide. 

Also, my point was, you said "when tide is favourable, go early". You don't say where the tide is favourable, so I assumed you meant more generally wind against tide across the course. 

What you actually meant, I now suppose, is that "when the tide is favourable on the left, go early". Which I agree completely with. 




Edited by mozzy - 29 Sep 17 at 4:24pm
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iGRF View Drop Down
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Posts: 6499 		Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 17 at 3:13pm
And if it's a cross tide?Say 3 knots in a 7 knot wind?

The pathfinder on port with the tide on it's weather bow and by starting early you get the tide on your lee bow with the associated combination of apparent wind (10 knots)with the fleet stationary being fed by a pathfinder boat (4 knots) ?
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Posts: 6662 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 17 at 2:58pm
Originally posted by mozzy

Not sure I understand GRFi's "if tide is favourable, start early". If it's favourable, then it's favourable for everyone, and the pathfinder will be being swept upwind just as quickly as the early starters... 

Well, that does presuppose the tide is constant across the course, which at most venues seems unlikely. If the tide is better on the left you don't want to start late and thus right.
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Posts: 823 		Post Options Post Options   Quote PeterG Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 17 at 2:50pm
Of course there is are tidal advantages - but they mostly due to there being differences in tidal current on different parts of the course - most notably for shore based clubs nearer or further from the shore.
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