Hi, Jay:

Good to hear from you! And you are quite right! The relevant Rule is #17.2:

17 On the Same Tack; Proper Course
              17.1 If a boat clear astern becomes overlapped within two of her hull lengths to leeward of a boat on 
                the same tack, she shall not sail above her proper course while they remain overlapped within that 
                distance, unless in doing so she promptly sails astern of the other boat. This rule does not apply if 
                the overlap begins while the windward boat is required by rule 13 to keep clear.
              17.2 Except on a beat to windward, while a boat is less than two of her hull lengths from a leeward 
                boat or a boat clear astern steering a course to leeward of her, she shall not sail below her proper 
                course unless she gybes.

The key phrase in this scenario is Proper Course which I can refresh you on:

Proper Course A course a boat would sail to finish as soon as possible in the absence of the other boats referred to in the rule using the term. A boat has no proper course before her starting signal. 
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Windward is not allowed to sail below her Proper Course as soon as a Leeward Boat (or one steering a course to pass to leeward) is less than two of Windward's hull lengths away. Thus, in your diagram, Windward is not allowed to sail below her Proper Course. If, in your diagram above, Windward had been sailing more or less a straight course towards the finish line or the next mark on a reach or run, she broke Rule 17.2 by suddenly bearing away.

Of course, there are any number of defensible Proper Courses. Windward could go to a hearing and say that bearing away was her Proper Course. But W would need to convince the Jury that she had a valid reason for doing so - one that had nothing to do with the fact that you (L) were about to pass W to leeward. Such a reason could be that W was trying to surf down a wave. If I were on a Jury, however, I would only believe this if W could demonstrate that he had been bearing away regularly to promote surfing down waves even before you (L) came into the picture.

Actually, an interesting point in your scenario is that under 17.1, you may not have had luffing rights but you were entitled to sail your Proper Course, as was W. If these courses are converging - as well they might be since you may well need to sail higher than W to keep your chute filled - the situation comes down to Rule 11 (windward boat keep clear). So when W bore down on you, you were entitled to hold your course (unless there was danger of a collision that would cause damage - Rule 14) and protest W under 17.2 AND 11. Even if W does not bear away at all but you are converging from leeward while sailing Proper Course, W must keep clear of L - see Case 50 of my Rules Quiz at http://www.angelfire.com/de2/WIT/Case50.htm

Well, Jay! This was fun! Don't let 'em do it to you again!!! Your skipper owes you a beer by the way!!! Best wishes for successful  and enjoyable sailing,

Uncle Al (W3854)

PS: My curiosity is aroused. Where do you sail? I sail mostly in the Toronto area in Canada.

----- Original Message ----- 
From: Jay Wadsworth 
To: 'Al Schonborn' 
Sent: Tuesday, May 15, 2001 4:31 PM

I sail in the only place worth sailing, :)...San Francisco Bay...nothing like a steady 28 knots gusting to 35 on a sunny day!  Thanks for the ruling, e-mailing skipper right now.

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Case #62
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If you have any Rules questions or scenarios that you'd like me to clarify,
I'd love to hear them and add them to this quiz!
Just contact Uncle Al at uncle-al@cogeco.ca