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TOPIC: Rule 7.2.1, Mast position

Rule 7.2.1, Mast position 8 years 9 months ago #95

  • ian_gregg
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7.2 Mast
7.2.1 The mast may be stepped on the deck or into the hull. With the mast spar perpendicular to the base line, the after side at deck level shall not be less than 3048mm and not more than 3202mm forward of Station 11. The mast spar may be fixed or rotating. No dimension of the mast spar cross section shall exceed 102mm.

I believe that there are a number of boats competing in international events that do not comply with this rule as their masts are stepped too far aft. I have heard some comment that this measurement is difficult to make but I feel strongly that the rule should be enforced or changed. I suggest that it is quite easy to measure from Station 11 to the aft edge of the base of the mast and that this is equivalent to making the measurement described in the rule. I propose that this measurement be made at all future chamionships and if there is any dispute regarding the measurement then perhaps the wording of the rule should be changed to:
7.2 Mast
7.2.1 The mast may be stepped on the deck or into the hull. The after side of the mast at the base shall not be less than 3048mm and not more than 3202mm forward of Station 11. The mast spar may be fixed or rotating. No dimension of the mast spar cross section shall exceed 102mm.
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Re:Rule 7.2.1, Mast position 8 years 9 months ago #101

  • sjl
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Personally I don't believe that this is the case. There were various allegations flying around the dinghy park in Palermo which were ill informed and incorrect. All of these coming from other competitors and not from the measurement team.

It is a difficult measurement to check, but not impossible on most boats, as a certain amount of de-rigging is required.

I'm not sure that measuring from the base of the mast will help at all as it is difficult to get a tape cleanly through from there to station 11.
Last Edit: 8 years 9 months ago by sjl.
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Re:Rule 7.2.1, Mast position 8 years 9 months ago #106

  • Thorney1
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Ian,

You make two separate points.

On the question of the rule wording, the same comment applies as in my reply to the thread about the boom. The rule uses ERS standard wording and therefore measurers know how to apply it, and jurors how to interpret it. One point to remember is that this measurement is not taken with the boat in sailing trim but with the mast perpendicular to the base line. This is easy to check, unless the shrouds (stays)do not have sufficient adjustment in which case they would have to be released. It also gives a constant check, regardless how the mast is stepped or rigged. When sailing the mast will normally be raked well aft of the perpendicular.

On the enforcement point, I have been to some championships where this was checked using a short length of mast stepped in the boat, and others where it has not. The inspection that takes place before an international championship is only a check of the items the chief measurer deems necessary to check, it is not a full measurement. The onus is still on the competitors to ensure their boat complies with the Rules. If a competitor considers that another has a boat that does not comply then there is a remedy under the Rules.
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Re:Rule 7.2.1, Mast position 8 years 9 months ago #108

  • PVG8831
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Maybe it is time someone challenges that rule. A competitor can check this on their own. Your forward bulkhead is supposed to be measured by the same perpendicular to the base line, right? Do some math, bulkhead to mast aft at the base. My book says the bulkhead sits at 3560 from station 11.( this does vary from boat to boat) The max aft we are allowed on the mast is 3048. So if my mast is less than 512 from the forward bulkhead I am within the rule. Am I right? Maybe it is time competitors pull out their measurement books and check if they are legal...

Paul
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