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starboard rounding rights

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Post Options Post Options   Quote ClubRacer Quote  Post ReplyReply Direct Link To This Post Topic: starboard rounding rights
    Posted: 21 Apr 19 at 7:17pm
From the diagram below what rights do each boat have at stages 1/2/3

My interpretation is port/starboard until yellow is passed head to wind and on its new course at which point I'm unsure if they acquire mark room or have zero rights at all as windward boat




Edited by ClubRacer - 21 Apr 19 at 9:03pm
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Post Options Post Options   Quote Brass Quote  Post ReplyReply Direct Link To This Post Posted: 21 Apr 19 at 9:52pm
@1 Y, on port is required to keep clear of B on starboard (rule 10), neither boat has reached the zone so there is no question of rule 18 applying.

@2 Y, still on port is required to keep clear of B still on starboard (rule 10), both boats are on a beat to windward, on opposite tacks and rule 18 does not apply (rule 18.1a).

@3 Y, on the same tack as B and overlapped to windward is still required to keep clear of B to leeward.  Boats are no longer on opposite tacks, and are in the zone so rule 18 applies.  Boats  were neither overlapped nor in a clear ahead/astern orientation when the first of them reached the zone, so rule 18.2b and c do not apply.  Rule 18.2a applies, B, the outside overlapped boat is required to give Y, inside, mark-room, and if, while sailing within the mark-room to which she is entitled, Y fails to keep clear of B, she shall be exonerated (rule 21a).


Edited by Brass - 21 Apr 19 at 10:23pm
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Post Options Post Options   Quote ClubRacer Quote  Post ReplyReply Direct Link To This Post Posted: 21 Apr 19 at 10:00pm
but i presume Y still has to give room for B to keep clear initially as per rule 15 

Would be hard in a protest hearing to differentiate between Y not giving time for B or B not giving space for Y
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Post Options Post Options   Quote Brass Quote  Post ReplyReply Direct Link To This Post Posted: 21 Apr 19 at 10:30pm
Originally posted by ClubRacer

but i presume Y still has to give room for B to keep clear initially as per rule 15 

Would be hard in a protest hearing to differentiate between Y not giving time for B or B not giving space for Y

At no time is Y a right of way boat:  she never has any obligations under rules 15 or 16, nor is she ever overlapped outside with mark-room obligations under rule 18.  At no time is Y required to give room to B to do anything.
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Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 19 at 3:36pm
Yellow is failing to keep clear of Blue when she tacks, as Blue could have hit her just by luffing a little.
If you re-imagine the animation with Y able to tack while keeping clear of B, the whole thing becomes a non-event.
Until you add in the other half dozen boats...
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Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 19 at 5:06pm
But is Blue allowed to change course to prevent Yellow from keeping clear (which is what a luff would be)?
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Post Options Post Options   Quote ClubRacer Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 19 at 5:59pm
The ability to animate it exactly how it happened on the water is limiting. Yellows tack was completed before the overlap was established.


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Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 19 at 6:10pm
Originally posted by Sam.Spoons

But is Blue allowed to change course to prevent Yellow from keeping clear (which is what a luff would be)?


True, while they are on different tacks, the definition of keep clear does not allow for the RoW boat to be able to alter course.
However, the boat on port's entitlement to be able to keep clear does not mean the starboard boat has to allow it room to tack. If the port boat can only keep clear by aborting its tack and carrying on on port, it would probably have to do so? So blue can head up at least until yellow has no option but to complete the tack?

In practice, if this becomes a protest, it will be a case that blue alters course believing yellow has tacked too close. It will be different views of exactly how the boats were positioned.
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Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 19 at 6:18pm
As drawn, blue doesn't have to do anything to give yellow mark room, except perhaps bear off a small amount as Y tacks again to round the mark.
Imagine if Blue track were half a boat width to windward, it would then have to actively give mark room as from the moment Y passed head to wind?
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 19 at 6:22pm
Subject to 18.2.f
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