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Windward mark situation |
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Henmch
Newbie Joined: 26 Dec 15 Online Status: Offline Posts: 18 |
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Topic: Windward mark situation Posted: 21 Jun 18 at 4:01pm |
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two dinghies approaching windward Mark on port tack in a force 2/3. Mark to be left to port. The boats are parallel to each other and the overlap existed before they entered the zone. Boat A is nearest the Mark about half a boat length away. Boat B is furthest from the Mark right on the edge of the zone. Boat B tacks onto starboard when they can lay the Mark and calls starboard on A. As soon as boat B is on their close hauled course Boat A also tacks to starboard. They can just make the Mark. Boat B has to go above close hauled course to avoid boat A although A was already on their close hauled course. Any thoughts on who is in the right. I'm wondering if as boat boats tacked within the zone there is any variation in the rule.
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JimC
Really should get out more Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6649 |
Post Options Quote Reply Posted: 21 Jun 18 at 4:26pm | |||||
Well, the rule isn't that complicated... run through it.
18.2b doesn't apply then.
so c doesn't apply either
and if b and c don't apply nor does d. and e doesn't apply.
so f doesn't apply
and 18.3 does not apply because *both* boats tacked in the zone. So we are left with plain 18.2 - outside gives inside room. |
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Hengest
Groupie Joined: 05 Jun 06 Location: United Kingdom Online Status: Offline Posts: 77 |
Post Options Quote Reply Posted: 22 Jun 18 at 11:44am | |||||
Why does 18.2 (b) not apply ?
(b) If boats are overlapped when the first of them reaches the zone, the outside boat at that moment shall thereafter give the inside boat mark-room. The boats were overlapped. So surely the outside boat has to give room. Which doesn't change the outcome, just a different part of the rule to end up in the same place |
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Brass
Really should get out more Joined: 24 Mar 08 Location: Australia Online Status: Offline Posts: 1146 |
Post Options Quote Reply Posted: 22 Jun 18 at 12:47pm | |||||
I'll break it down a little bit further. See JimC's post above for the text of the rules.
Initially, boats were overlapped on the same tack when the first of them reached the zone: rule 18.2( b ) applied and B, the outside boat was required to give A, inside mark-room.
Rule 18, in its entirety, and including rule 18.2( b ), ceases to apply when B passes head to wind, because boats are then on opposite tacks and the proper course of one of them, at the mark is to tack (rule 18.1( a )). While tacking, B is required to keep clear of A (rule 13)
B becomes the right of way boat (rule 10), initially required to give A room to keep clear ( rule 15)
A is still required to keep clear of B, now under rule 13. From the instant A passes head to wind, both boats are on the same tack, they are no longer on opposite tacks and some part of rule 18 may apply (rule 18.1). Rule 18.2 ( b ) can't apply because it got switched off when B tacked. Rule 18.3 is a candidate: A is certainly tacking in the zone, but B was not 'on starboard tack since entering the zone': B came onto starboard tack after she had entered the zone: rule 18.3 does not apply. So the only rule left is good old rule 18.2( a ), and it will apply, if and only if the boats become overlapped. When A reaches her close hauled course, she is (presumably) clear ahead of B, and the right of way boat (rule 12), required to give B room to keep clear (rule 15).
While A is clear ahead, her obligation was initially to give B room to keep clear, which she did: there was ample space for B to luff above close hauled and keep clear. If, B, having luffed above A, then becomes overlapped outside A, B will still be required to keep clear of A, now under rule 11, and also required to give A mark-room. If B had dived, and hooked A to leeward, she would have gained right of way and mark-room as leeward inside boat.
So, yes, B, passing head to wind inside the zone, switched rule 18.3 off. |
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deadrock
Groupie Joined: 24 Jun 08 Location: United Kingdom Online Status: Offline Posts: 85 |
Post Options Quote Reply Posted: 23 Jun 18 at 3:39pm | |||||
Reference Brass's 'If B had dived, and hooked A to leeward, she would have gained right of way and mark-room as leeward inside boat.' The OP has stated that A is only about half a boat-length from the mark when it tacks. That close to the mark, if B dives inside A to gain an overlap, 18(f) would surely apply. 18(f) is not dependent on the other sub-sections of Rule 18.
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Brass
Really should get out more Joined: 24 Mar 08 Location: Australia Online Status: Offline Posts: 1146 |
Post Options Quote Reply Posted: 24 Jun 18 at 8:20am | |||||
Good point.
But A had better be doing all she can, in a seamanlike way.
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