There is no restriction in the class rules.
There may be a restriction in the Sailing Instructions for a specific event, although it is generally up to the discretion of the PRO depending on the ability of the fleet and the Organizing Authority's ability to render assistance to people who need it.
We had a situation a while back on one of our island races where we shortened the course because of too much wind. This was mainly for safety of the fleet, not just the beachcats but all the boats, and we had some good sized sleds entered.
The breeze was really brisk where we were, but where we were going was a different story.... as the local weather station closest to the first mark was showing 50 kts with a few peak gust of 60 plus.. We still had a great race that day closer to shoreline with an average wind of 15 to 20 kts... with some great up wind and spinnaker runs.
Funny story from that day, we actually had a entrant tell us the missed the start because there wasn't enough wind to make it to the start staging area which was a screaming beam reach from where we launched from.... and we the race committee should consider having a tow boat for future races! Guess you can't please everyone.
I have set my own personal limits of 25 kts plus and I am not going out....replacement parts are getting expensive...
