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Port/Stbd and tacking |
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jeffers 
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Joined: 29 Mar 04 Location: United Kingdom Online Status: Offline Posts: 3048 |
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 Topic: Port/Stbd and tackingPosted: 10 Apr 17 at 12:14pm |
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Situation that happened at the weekend.
2 boats (single handed dinghies sailing in F2) approaching on opposite tacks. P cannot cross S so elects to do a late duck and come immediately back up to close hauled. As P crosses the transom of S they change course to come back to close hauled. S also simultaneously tacks leaving both boats very close together. As S completes her tack there is light contact as P bears away to try and avoid a collision and S heads up to do the same. S did turns but there was discussion after. So what do people think? My interpretation was that S broke rule 13 (while tacking) and possibly rule 11 (overlapped, WW boat must keep clear). P was entitled to change course back to close hauled as they had kept clear of S by ducking and S tacking meant that rule 15 (acquiring right of way) applied between them the right of way for P was established by the action of S.
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Paul
---------------------- D-Zero GBR 74 |
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JimC
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Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6661 |
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Posted: 10 Apr 17 at 12:30pm |
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Agree. Reckon as soon as previous S passes head to wind she is give way boat (RRS13), and continues to be give way boat as Windward. Because L (previous P) acquires ROW as a result of S' action she is not required to give S room to keep clear. W, on the other hand is required to give L room as soon as she passed head to wind.
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Brass
Really should get out more
Joined: 24 Mar 08 Location: Australia Online Status: Offline Posts: 1151 |
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Posted: 10 Apr 17 at 2:39pm |
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C'mon guys,
P acquires right of way because of S's actions [when S passes head to wind]. Rule 15 does NOT apply. From the time S passes head to wind, she is required to keep clear of P, initially rule 13 then rule 11. As long as P does not change course so as to fail to give S room to keep clear (rule 16), room does NOT apply. There is contact, seemingly after S had reached a close hauled course. S broke rule 11. There was no constraint on S dwelling in hear tack or otherwise avoiding contact with P. S broke rule 14. S was neither entitled to right of way nor room. S cannot be exonerated for breaking rule 14 under rule 14( b ). It would not have been clear to P that S would continue to rotate through her tack so as not to keep clear of P: it was not reasonably possible for P, acting no sooner than it was clear that S was not keeping clear, to avoid contact with S. P did not break rule 14.
Edited by Brass - 10 Apr 17 at 2:40pm |
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jeffers
Really should get out more
Joined: 29 Mar 04 Location: United Kingdom Online Status: Offline Posts: 3048 |
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Posted: 10 Apr 17 at 3:20pm |
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I would have thought the second half of rule 15 was very relevant here 'unless she acquires right of way because of the other boats actions.' S was saying the P should have given them room to keep clear under 16.1 but she was not entitled to room to keep clear due to how the right of way was established. S also says that P came above close hauled which I am guessing they were not allowed to do so without giving room under 16.1 but were perfectly entitled to resume their previous (and proper) course?
Edited by jeffers - 10 Apr 17 at 3:22pm |
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Paul
---------------------- D-Zero GBR 74 |
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giraffe
Posting king 
Joined: 10 May 07 Online Status: Offline Posts: 148 |
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Posted: 10 Apr 17 at 3:51pm |
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As the boats converge P must keep clear of S
P does this by going behind S Once P has gone behind S they are moving apart from each other. Once S is tacking, S must keep clear of all boats Once S has completed its tack they may be windward boat relative to P, and still required to keep clear P does not need to anticipate what S might do next and P may alter course as she pleases S needs to make sure that she can keep clear Once P realises S is going to get too close she should try to avoid contact In these circumstances it really is practically impossible for P to foul S The situation will be exacerbated if S is headed as P goes behind. This is a problem for S and not for P. The solution is for S to delay its tack. |
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Brass
Really should get out more
Joined: 24 Mar 08 Location: Australia Online Status: Offline Posts: 1151 |
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Posted: 10 Apr 17 at 11:32pm |
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P acquired right of way because of S's action in passing head to wind. Rule 15 did not apply.
S seems to be confusing rules 15 and 16. In your OP you say 'as P crosses the transom of S they change course to come back to close hauled.' Presumably (at least on P's evidence), P then held a steady close hauled course. At that time P changed course, it is highly unlikely that S had passed head to wind, thus P was still give way boat and under no obligation to give S room under rule 16.1. Even if S had passed head to wind when P changed course back to close hauled, S still had ample room to hold up in the tack and keep clear of P. Only if P made further changes in course after S began to bear away to close hauled is P exposed under rule 16.1, and given that S could always hold up or luff back, there is always room for S to keep clear. Maybe, just maybe, if P put in a quick luff (whacked up by a wave or whatever) just as S was reaching close hauled, it could be argued that P changed course too fast for S to respond. That's putting stuff in your OP that isn't there.
Proper course is irrelevant. Rule 17 does not apply because the overlap began when S passed head to wind and simultaneously became a port tack boat and required by rule 13 to keep clear (rule 17, last sentence). Whether P sails above close hauled or not is none of S's business unless, in order to do so, P changed course in such a way that that she did not give S room to keep clear. This sounds like S tried a slam dunk, when it wasn't on, and is now wriggling.
Edited by Brass - 10 Apr 17 at 11:39pm |
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Brass
Really should get out more
Joined: 24 Mar 08 Location: Australia Online Status: Offline Posts: 1151 |
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Posted: 10 Apr 17 at 11:36pm |
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Edited by Brass - 10 Apr 17 at 11:37pm |
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