fairing rudder and daggerboard

Thread starter #1
I'm getting my blades ready for the Master worlds in Kingston this summer. My blades are from 09 but they are chipped and need some fairing and some TLC. I'm not asking how to do it, i'm wondering about measuring them in. How do i know if the trailing edge is too thin or if i sand the shape down a bit too much? I want them to obviously be legal and last thing i need is to fair them and then not pass measurement?
What is the typical measurement process? I'm from the J24 class, so i'm very well aware of typical keel measurements and so on, is it the same for laser worlds?
thanks
Jean
 

LaLi

Active Member
#2
Class rule 14 b: The trailing edge of the centreboard may be sharpened by sanding the blade between the trailing edge and a line 100 mm parallel to the trailing edge, provided the distance between the leading edge and the trailing edge of the blade is not reduced.

Class rule 15 a: The trailing edge of the rudder blade may be sharpened by sanding the blade between the trailing edge and a line 60 mm parallel to the trailing edge, provided the distance between the leading edge and the trailing edge of the blade is not reduced.
 

LaLi

Active Member
#5
The actual thickness of a Laser centreboard is 31 mm. If you build it to 33, you have to add so much material that you're breaking the class rule which prohibits changing the original shape, even if it stays within the tolerance.
 

LaLi

Active Member
#7
At the 2014 Master's Worlds in Hyeres, a number of brand new blades would not pass through the template.
That's crazy. But it underscores what I almost wrote in my previous post (but didn't), that the tolerances are aimed at the builders rather than the sailors. And reminds me of another Australian on this forum who recently said that measurement checks exist not only to see what people do to their equipment, but what is sold to them in the first place.
 
#8
I believe all the inconsistency issues with the old foils have been resolved with the new ones. I recently bought a set of the new GRP ones. They are far nicer than the old epoxy versions and can be used right out of the box.
 

LaLi

Active Member
#9
I believe all the inconsistency issues with the old foils have been resolved with the new ones.
If there have been measurement problems as recently as last year, then it doesn't have anything to do with "new" and "old" as the construction was changed much earlier.
 

AlanD

Former ISAF Laser Measurer
#11
The GRP boards in Australia are up to about mk6 of those released onto the market and the process has taken about 12 years to get to the current ones with lots of teething problems. I very much doubt that European builder got it right the first time and is probably still playing catch up.
 
Top