The PRO at our recent Alter Cup qualifier aborted a start sequence because the wind speed was reportedly below the "required minimum wind speed" of 5.0 mph. The wind was reportedly 4.3 mph 5 ft above the foredeck of the Cal 34 RC boat. I've looked around, and cannot find a listed minimum windspeed for these events, including on the SI's for that particular regatta. I know I started races in less than that at the same event last year - there'd have been no racing Saturday otherwise!
Thanks for y'all's wisdom.