The classic symetric spinnaker is designed to be used with a spinnaker pole that attaches to the mast, and you gybe the pole along with the spin, switching tack for clew on the new gybe. The Asymetrics do not switch tack and clew, they leave the tack attached to the end of the pole, and the clew is cut higher so the sheeting angle is right for a high reach, which is the point of sail you will be on most of the time, never being dead downwind, which is the only point of sail a symetical spin. would be of any use. You could try to use a symetrical spin. as an asymetric, but the sheeting angle would be all wrong and the foot might even drag in the water on a reach. You might be able to take it to a good sailmaker and get it re-cut to use it as an asymetric. You would still be better off getting a good, used, purpose built cat spin. though.
