Showing posts with label revisited. Show all posts
Showing posts with label revisited. Show all posts

Wednesday, 14 March 2012

Retro Wednesday 1: Zoning Laws revisited

On a suggestion from one of my long standing readers and member of the original 'Look to Windward' -study group back in '04, I'm going to revisit some old posts. He quit rightly pointed out that the number of readers has increased (somewhat) and that most of you don't have the time to go back trough the thousand plus posts I've published, to sort out the diamonds in the fluff. Thanks H!

Subject: Zoning Laws.
First posted 22 March 2009

I don't know how many of you participate in multi-class events, but this situation can only happen there. Two boats - with distinctive different hull lengths - approach a leeward mark to be left to port.


The zone in the RRS is defined as:
The area around a mark within a distance of three hull lengths of the boat nearer to it. A boat is in the zone  when any part of her hull is in the zone.
In the animation I've drawn two circles, the bigger one is representing the area within three hull lengths using the Grey boat and the dotted circle is the same area but using the Red (smaller) boat's length.

In position 1 Red is closest to the mark, so neither of the two boats has reached the zone.

In position 2 Grey gets an inside overlap, but neither has reached the zone, yet

Just before position 3 Grey's bow has passed the bow of Red and she is now the boat closest to the mark. The zone therefore is now represented by the bigger circle, which means that both boats are completely in the zone.

In position 4 Red bears away - sailing by the lee - and Grey sails to the mark and rounds it. As does Red.

Is Grey entitled to do this, in other words does Red have to give mark-room?
If possible. give me your analysis with the relevant rules

If you can't wait and want to peak to find the answer, read the comments after the original post: Zoning Laws

J.


PS: Although the Poll has not yet run its total number of days, the predictions indicate a overwhelming majority of readers want the 'Full Monty' in their mail-box or feedreader. So as of yesterday I've changed the settings accordingly.

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