Measurer’s Interpretations and Recommendations
|Question:||Is the allowed purchase of the mainsheet 8:1 and can this be accomplished with a fine and coarse set of blocks?|
|Short Answer:||Yes |
|Answer:||The Class Rules are quiet on this. The technical committee has agreed that 8:1 should be allowed and it may be comprised of a course and fine control. Changes to the Rules are in being proposed to make this clear. |
Sat Oct 19 11:30:12 2019
|2007-10-27||Richard Robbins||Normally the mainsheet is rigged with a 4:1 purchase. The "Blue Book" seems to be quiet on what is allowed but every where else that the purchase is specified it is up to 8:1. Some boats sail with 3:1 and others have used (or want to use) more then 4:1. I would tend to allow anything up to 8:1. As to the fine and course sets of blocks it could be argued that since they are not on the official plan it would not be allowed but I am open to ideas on this part of the issue.|
|2007-11-16||Richard Robbins||Relevent Sections include:
Section 4 - 6.4
Mainsheet Bail - A bail for the Mainsheet turning block shall be located 13 feet 3/4 inches from the after face of the mast. The turning block may be a double block.
Section 4 - 8.1
Mainsheet Trim Arrangement - The location of a block and cleat on the boom for adjusting the mainsheet is optional. (See specification 6.1 and Section VII - Official Plan 2)|
|2008-03-04||Kristian Martincic||Ask any main trimmer who was at day 3 of the 07 Nationals: more purchase on the mainsheet would be a great thing!
It seems that both the allowable purchase and the location of hardware for this system could be made much clearer in the blue book. I think that rule 8.5 (traveler controls) makes a good model for this type of rule, when it states that the arrangment and lines are optional, but limits the purchase to 8:1.
A gross tune/fine tune arrangement would be very effective, and not difficult to add to the boat. My first thought would be to add an 8:1 fine tune to the 4:1 mainsheet, and lead the line to a small pivoting exit block (Harken 299) on the boom, in a very similar fashion to the current block and cleat assembly.
If this were made legal, my only gripe would be that it came after I traded in the main trim spot for driver! |
|2008-07-30||Richard Robbins||8:1 with fine/course control adopted by Governing Board July 29, 2008. See July, 2008 Version of Rules.|