I think the A class uses 22 mph, and I hear their sailors refer to it often.
If you're going to try to apply a standard, there is one that is actually in use.
Don't see them communicated much. Maybe I don't look closely enough... Unless "cancel conditions" for my boat are clearly stated, it's hard to know if it's worth it to go. 22 mph sounds good. The point, however, is that you don't say you're going to do something and then pull the plug for a reason that is not communicated IN ADVANCE.
