Sail – C Sail $59.00 $38.00 Best for winds 18 – 28 mph. Sail Number Pair of Sail Numbers (one pair per sail) SKU: LCSAIL Posted in RC Laser, Sail/Rigging. Sail for racing in winds over 18 mph. The C sail (600 sq in) fits on the standard mast and is used for winds 18-28 mph. It uses the standard mast and boom even though you may want to consider getting a shorter boom (17″ is the class minimum) to use this sail in heavier winds. Recommended for racing.